diff --git "a/llmeval-env/lib/python3.10/site-packages/torchgen/model.py" "b/llmeval-env/lib/python3.10/site-packages/torchgen/model.py" new file mode 100644--- /dev/null +++ "b/llmeval-env/lib/python3.10/site-packages/torchgen/model.py" @@ -0,0 +1,2795 @@ +import dataclasses +import itertools +import re + +from dataclasses import dataclass +from enum import auto, Enum +from typing import Callable, Dict, Iterator, List, Optional, Sequence, Set, Tuple, Union + +from torchgen.utils import assert_never, NamespaceHelper, OrderedSet + +# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # +# +# DATA MODEL +# +# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # +# +# Some general principles for our data model. +# +# - Stop using C++ data types as the internal data representation +# format. Instead, the internal data structures are centered +# around JIT schema representation. This avoid a big problem +# with the old codegen where we read in all the types from +# native_functions.yaml and then immediately had to retranslate +# them into C++ types. +# +# - More semantic data representation. Instead of representing +# everything as dicts and strings, we define dataclasses for +# every interesting entity the code generation has to deal with. +# These dataclasses have strong semantic invariants: for example, +# we generally require them to roundtrip losslessly into the +# form they were parsed from. These structures are immutable +# and you're expected to populate information once during +# construction. + + +# Represent a source location; used for better error reporting +@dataclass(frozen=True) +class Location: + file: str + line: int + + def __str__(self) -> str: + return f"{self.file}:{self.line}" + + +# Valid values of the 'variants' field in native_functions.yaml +class Variant(Enum): + function = auto() + method = auto() + + +# Default kernel namespace +DEFAULT_KERNEL_NAMESPACE = "at::native" + +# NOTE: Keep the list in sync with `DispatchKey` in c10/core/DispatchKey.h +BACKEND_COMPONENTS = "CPU CUDA HIP XLA MTIA MPS IPU XPU HPU VE Lazy Meta PrivateUse1 PrivateUse2 PrivateUse3".split() +FUNCTIONALITY_KEYS = [ + "", + "Quantized", + "Sparse", + "SparseCsr", + "NestedTensor", + "Autograd", +] + +# This list guards dispatches that can be used in derivatives.yaml +# For now we omit AutogradFunctionality and AutogradOther +AUTOGRAD_KEYS = ["AutogradNestedTensor"] + [ + "Autograd" + component for component in BACKEND_COMPONENTS +] + +FRAGMENT_NAMESPACES = {"quantized", "quantized_decomposed"} + + +# This doesn't have to be in sync with the header, it only needs to contain +# entries that we actually use in the codegen or want pyi entries for +class DispatchKey(Enum): + Undefined = 0 + CatchAll = Undefined + + FPGA = auto() + ORT = auto() + Vulkan = auto() + Metal = auto() + MKLDNN = auto() + OpenGL = auto() + OpenCL = auto() + IDEEP = auto() + CustomRNGKeyId = auto() + MkldnnCPU = auto() + Sparse = auto() + SparseCsr = auto() + NestedTensor = auto() + Dense = auto() + + PreDispatch = auto() + Python = auto() + FuncTorchDynamicLayerBackMode = auto() + ZeroTensor = auto() + Conjugate = auto() + Negative = auto() + BackendSelect = auto() + Named = auto() + AutogradOther = auto() + AutogradFunctionality = auto() + AutogradNestedTensor = auto() + Tracer = auto() + Autocast = auto() + Batched = auto() + VmapMode = auto() + FuncTorchGradWrapper = auto() + FuncTorchBatched = auto() + BatchedNestedTensor = auto() + FuncTorchVmapMode = auto() + FuncTorchDynamicLayerFrontMode = auto() + Functionalize = auto() + TESTING_ONLY_GenericWrapper = auto() + TESTING_ONLY_GenericMode = auto() + + ADInplaceOrView = auto() + Autograd = auto() + CompositeImplicitAutograd = auto() + CompositeImplicitAutogradNestedTensor = auto() + CompositeExplicitAutograd = auto() + CompositeExplicitAutogradNonFunctional = auto() + FuncTorchBatchedDecomposition = auto() + + # BEGIN autogenerated + CPU = auto() + CUDA = auto() + HIP = auto() + XLA = auto() + MTIA = auto() + MPS = auto() + IPU = auto() + XPU = auto() + HPU = auto() + VE = auto() + Lazy = auto() + Meta = auto() + PrivateUse1 = auto() + PrivateUse2 = auto() + PrivateUse3 = auto() + QuantizedCPU = auto() + QuantizedCUDA = auto() + QuantizedHIP = auto() + QuantizedXLA = auto() + QuantizedMTIA = auto() + QuantizedMPS = auto() + QuantizedIPU = auto() + QuantizedXPU = auto() + QuantizedHPU = auto() + QuantizedVE = auto() + QuantizedLazy = auto() + QuantizedMeta = auto() + QuantizedPrivateUse1 = auto() + QuantizedPrivateUse2 = auto() + QuantizedPrivateUse3 = auto() + SparseCPU = auto() + SparseCUDA = auto() + SparseHIP = auto() + SparseXLA = auto() + SparseMTIA = auto() + SparseMPS = auto() + SparseIPU = auto() + SparseXPU = auto() + SparseHPU = auto() + SparseVE = auto() + SparseLazy = auto() + SparseMeta = auto() + SparsePrivateUse1 = auto() + SparsePrivateUse2 = auto() + SparsePrivateUse3 = auto() + SparseCsrCPU = auto() + SparseCsrCUDA = auto() + SparseCsrHIP = auto() + SparseCsrXLA = auto() + SparseCsrMTIA = auto() + SparseCsrMPS = auto() + SparseCsrIPU = auto() + SparseCsrXPU = auto() + SparseCsrHPU = auto() + SparseCsrVE = auto() + SparseCsrLazy = auto() + SparseCsrMeta = auto() + SparseCsrPrivateUse1 = auto() + SparseCsrPrivateUse2 = auto() + SparseCsrPrivateUse3 = auto() + NestedTensorCPU = auto() + NestedTensorCUDA = auto() + NestedTensorHIP = auto() + NestedTensorXLA = auto() + NestedTensorMTIA = auto() + NestedTensorMPS = auto() + NestedTensorIPU = auto() + NestedTensorXPU = auto() + NestedTensorHPU = auto() + NestedTensorVE = auto() + NestedTensorLazy = auto() + NestedTensorMeta = auto() + NestedTensorPrivateUse1 = auto() + NestedTensorPrivateUse2 = auto() + NestedTensorPrivateUse3 = auto() + AutogradCPU = auto() + AutogradCUDA = auto() + AutogradHIP = auto() + AutogradXLA = auto() + AutogradMTIA = auto() + AutogradMPS = auto() + AutogradIPU = auto() + AutogradXPU = auto() + AutogradHPU = auto() + AutogradVE = auto() + AutogradLazy = auto() + AutogradMeta = auto() + AutogradPrivateUse1 = auto() + AutogradPrivateUse2 = auto() + AutogradPrivateUse3 = auto() + # END autogenerated + + def __str__(self) -> str: + return self.name + + def lower(self) -> str: + return str(self).lower() + + @staticmethod + def parse(value: str) -> "DispatchKey": + for k, v in DispatchKey.__members__.items(): + if k == value: + return v + raise AssertionError(f"unknown dispatch key {value}") + + +class _TorchDispatchModeKey(Enum): + FAKE = auto() + PROXY = auto() + FUNCTIONAL = auto() + + +def codegen_per_backend_entries() -> str: + r = [] + for fk in FUNCTIONALITY_KEYS: + for bc in BACKEND_COMPONENTS: + r.append(f" {fk}{bc} = auto()") + return "\n".join(r) + + +for fk in FUNCTIONALITY_KEYS: + for bc in BACKEND_COMPONENTS: + if not hasattr(DispatchKey, fk + bc): + r = codegen_per_backend_entries() + print(r) + raise RuntimeError( + f"Missing {fk}{bc} from DispatchKey enum. Here is the autogenerated list we expect to have:\n\n{r}" + ) + + +STRUCTURED_DISPATCH_KEYS = {DispatchKey.MPS, DispatchKey.CUDA, DispatchKey.CPU} +UFUNC_DISPATCH_KEYS = {DispatchKey.CUDA, DispatchKey.CPU} + +# Set of supported dispatch keys +dispatch_keys = [ + DispatchKey.CPU, + DispatchKey.SparseCPU, + DispatchKey.SparseCsrCPU, + DispatchKey.MkldnnCPU, + DispatchKey.CUDA, + DispatchKey.MPS, + DispatchKey.SparseCUDA, + DispatchKey.SparseCsrCUDA, + DispatchKey.QuantizedCPU, + DispatchKey.QuantizedCUDA, + DispatchKey.CompositeImplicitAutograd, + DispatchKey.CompositeImplicitAutogradNestedTensor, + DispatchKey.CompositeExplicitAutograd, + DispatchKey.CompositeExplicitAutogradNonFunctional, + DispatchKey.NestedTensorCPU, + DispatchKey.NestedTensorCUDA, + # Meta is a magic key: it is automatically generated for structured + # kernels + DispatchKey.Meta, + DispatchKey.SparseMeta, + DispatchKey.SparseCsrMeta, + DispatchKey.QuantizedMeta, + DispatchKey.NestedTensorMeta, + DispatchKey.ZeroTensor, +] + + +# Dispatch keys that "support all backends". These codegen slightly differently +# then backend specific keys. +def is_generic_dispatch_key(dk: DispatchKey) -> bool: + return dk in { + DispatchKey.CompositeExplicitAutograd, + DispatchKey.CompositeExplicitAutogradNonFunctional, + DispatchKey.CompositeImplicitAutograd, + DispatchKey.CompositeImplicitAutogradNestedTensor, + } + + +# CUDA specific dispatch keys +def is_cuda_dispatch_key(dk: DispatchKey) -> bool: + return dk in { + DispatchKey.CUDA, + DispatchKey.QuantizedCUDA, + DispatchKey.SparseCUDA, + DispatchKey.SparseCsrCUDA, + DispatchKey.NestedTensorCUDA, + DispatchKey.AutogradCUDA, + } + + +# Structured kernel generation is only supported for certain key types; +# otherwise use old-style +def is_structured_dispatch_key(dk: DispatchKey) -> bool: + return dk in STRUCTURED_DISPATCH_KEYS + + +def is_ufunc_dispatch_key(dk: DispatchKey) -> bool: + # For now, ufunc dispatch keys coincide with structured keys + return dk in UFUNC_DISPATCH_KEYS + + +# This is oddly named ScalarType and not DType for symmetry with C++ +class ScalarType(Enum): + Byte = auto() + Char = auto() + Short = auto() + Int = auto() + Long = auto() + Half = auto() + Float = auto() + Double = auto() + ComplexHalf = auto() + ComplexFloat = auto() + ComplexDouble = auto() + Bool = auto() + BFloat16 = auto() + Float8_e5m2 = auto() + Float8_e5m2fnuz = auto() + Float8_e4m3fn = auto() + Float8_e4m3fnuz = auto() + + def __str__(self) -> str: + return self.name + + @staticmethod + def maybe_parse(value: str) -> Optional["ScalarType"]: + for k, v in ScalarType.__members__.items(): + if k == value: + return v + return None + + @staticmethod + def parse(value: str) -> "ScalarType": + mb_r = ScalarType.maybe_parse(value) + assert mb_r is not None, f"unknown dtype {value}" + return mb_r + + @staticmethod + def parse_set(values: str) -> OrderedSet["ScalarType"]: + dtypes: OrderedSet[ScalarType] = OrderedSet() + for value in values.split(", "): + if value in DTYPE_CLASSES: + dtypes.update(DTYPE_CLASSES[value]) + else: + dtypes.add(ScalarType.parse(value)) + return dtypes + + +DTYPE_CLASSES: Dict[str, OrderedSet[ScalarType]] = {} +# NB: Integral doesn't include boolean +DTYPE_CLASSES["Integral"] = OrderedSet( + [ + ScalarType.Byte, + ScalarType.Char, + ScalarType.Int, + ScalarType.Long, + ScalarType.Short, + ] +) +# NB: Floating doesn't include low precision types +DTYPE_CLASSES["Floating"] = OrderedSet([ScalarType.Float, ScalarType.Double]) +DTYPE_CLASSES["Complex"] = OrderedSet( + [ScalarType.ComplexFloat, ScalarType.ComplexDouble] +) +DTYPE_CLASSES["All"] = DTYPE_CLASSES["Integral"] | DTYPE_CLASSES["Floating"] +DTYPE_CLASSES["AllAndComplex"] = DTYPE_CLASSES["All"] | DTYPE_CLASSES["Complex"] +DTYPE_CLASSES["FloatingAndComplex"] = ( + DTYPE_CLASSES["Floating"] | DTYPE_CLASSES["Complex"] +) + + +# Represents the valid entries for ufunc_inner_loop in native_functions.yaml. +# NB: if you add a new UfuncKey, you will teach torchgen.dest.ufunc how +# to process it. Most logic will ignore keys they don't understand, so your +# new key will get silently ignored until you hook in logic to deal with it. +class UfuncKey(Enum): + # These are low level keys that represent exactly one particular + # instantiation of the kernel produced by codegen + CUDAFunctor = auto() + CUDAFunctorOnOther = auto() + CUDAFunctorOnSelf = auto() + + CPUScalar = auto() + CPUVector = auto() + + # These are the ones users will usually specify, and + # implicitly "fill in" the low level keys + ScalarOnly = auto() # CUDA*, CPUScalar + Generic = auto() # CUDA*, CPU* + + def __str__(self) -> str: + return self.name + + @staticmethod + def parse(value: str) -> "UfuncKey": + for k, v in UfuncKey.__members__.items(): + if k == value: + return v + raise AssertionError(f"unknown ufunc key {value}") + + +class DeviceCheckType(Enum): + NoCheck = 0 + ExactSame = 1 + + +class ViewSchemaKind(Enum): + aliasing = auto() + aliasing_inplace = auto() + non_aliasing = auto() + + +# The basic input to the code generation is native_functions.yaml. +# The name "native", BTW, comes from the distinction between native +# functions and legacy TH functions. The legacy TH functions are gone, +# but the "native" descriptor has stuck. +# +# NativeFunction models a single entry in native_functions.yaml. Its +# fields roughly correspond to what you would see in the YAML itself, +# but after canonicalization and parsing has occurred. +# +# You can see some of the overall design patterns for how we setup +# dataclasses in this class, but we will defer a complete discussion +# of this at FunctionSchema. +@dataclass(frozen=True) +class NativeFunction: + # The namespace for this operator. For example, if we have "at::add" + # then the namespace would be "at". This enables ops to be registered + # through the same DSL with a custom namespace. If not specified, the + # default namespace would be "at". + namespace: str + + # The function schema of the operator in question. This schema + # has been parsed; see FunctionSchema for more about its structure. + # (This type is quoted as we are forward referencing a type + # defined later in the file. I opted for this ordering of the + # classes for expository clarity.) + func: "FunctionSchema" + + # Whether or not to generate mutable tensor arguments like regular + # ones + use_const_ref_for_mutable_tensors: bool + + # Whether or not to omit automatic generation of a DeviceGuard + device_guard: bool + + # How to emit automatic generation of device check + device_check: DeviceCheckType + + # What python module to put the function in + python_module: Optional[str] + + # TODO: figure out what this does + category_override: Optional[str] + + # If no variants are specified in native_functions.yaml, this is + # assumed to be {'function'}. + variants: Set[Variant] + + # Whether or not we should skip generating registrations for + # this kernel. This is a bit of a double-edged sword, as manual + # registrations don't participate in codegen-based selective build! + manual_kernel_registration: bool + + # Whether or not to skip generating TensorMethod/Functions bindings + # for this kernel. Technically, this doesn't actually skip generating + # the binding; instead, the binding gets generated to __dispatch_{funcname} + # so you can make use of the normal binding if you need it. + manual_cpp_binding: bool + + # The location in the YAML file were this native function entry was + # defined. This is for conveniently reporting error messages! + loc: "Location" + + # A list of operators that are expected to be auto-generated for this NativeFunction. + # Note: This list isn't actually directly used by the codegen to generate anything. + # Instead, the codegen figures out what operators to generate purely based off of + # function schema, and uses the autogen declarations to error check. + # We expect every NativeFunction that gets auto-generated be explicitly called out + # in native_functions.yaml + autogen: List["OperatorName"] + + # If non-empty, this kernel is subject to ufunc codegen. + # Sorted by ufunc_key + ufunc_inner_loop: Dict[UfuncKey, "UfuncInnerLoop"] + + # Whether or not this out functions is a "structured kernel". Structured + # kernels are defined a little differently from normal kernels; in + # particular, their shape checking logic is defined separately from + # the kernel. Only out functions can be structured; other functions + # delegate to the out function using the structured_delegate keyword. + # Every structured kernel must have at least an out and a functional + # variant. + structured: bool + + # Whether or not this non-out function is a structured kernel, defined + # in terms of the out kernel referenced by the string here. + structured_delegate: Optional["OperatorName"] + + # Only valid for structured kernels. Specifies alternative of what + # to inherit from when defining the meta class for the structured + # operator. This will usually be TensorIteratorBase. This also + # changes the semantics of set_output to call the parent class. + structured_inherits: Optional[str] + + # Structured kernels can declare elements as "precomputed". These elements + # are returned by the meta function in one struct and passed to the impl + # function in lieu of certain kernel arguments that these precomputed + # elements supersede. Information about the names and types of these + # precomputed elements and how they correspond to kernel arguments is stored + # in this member, if applicable. + precomputed: Optional["Precompute"] + + # Argument names whose default should be excluded from the C++ interface. + # Intended for resolving overload ambiguities between signatures. + cpp_no_default_args: Set[str] + + # Note [Abstract ATen methods] + # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + # An abstract ATen method is one whose dispatch differs between + # types. These are implemented in derived types (with a + # standard (throwing) definition in Type). A concrete ATen + # method is one which has the same dispatch for all types; + # we just implement it in the base Type. This is exposed + # in Declarations.yaml via a field named 'abstract'. + is_abstract: bool + + # Whether or not the NativeFunction contains a backend-agnostic kernel + has_composite_implicit_autograd_kernel: bool + has_composite_implicit_autograd_nested_tensor_kernel: bool + has_composite_explicit_autograd_kernel: bool + has_composite_explicit_autograd_non_functional_kernel: bool + + # Tags are used to describe semantic information about (groups of) operators, + # That aren't easily inferrable directly from the operator's schema. + tags: Set[str] + + # NB: The benefit of defining a dataclass is that we automatically get + # a constructor defined for all the fields we specify. No need + # to explicitly write it out. + + # We parse both the NativeFunction + backend-specific information about it, which it stored in a corresponding BackendIndex. + @staticmethod + def from_yaml( + ei: Dict[str, object], + loc: "Location", + valid_tags: Set[str], + ignore_keys: Optional[Set[DispatchKey]] = None, + ) -> Tuple[ + "NativeFunction", Dict[DispatchKey, Dict["OperatorName", "BackendMetadata"]] + ]: + """ + Parse a NativeFunction from a dictionary as directly parsed + from native_functions.yaml + """ + e = ei.copy() + + funcs = e.pop("func") + assert isinstance(funcs, str), f"not a str: {funcs}" + # only support one level of namespace. E.g., aten::add + namespace_helper = NamespaceHelper.from_namespaced_entity( + namespaced_entity=funcs, max_level=1 + ) + namespace = namespace_helper.get_cpp_namespace(default="aten") + func = FunctionSchema.parse(namespace_helper.entity_name) + + cpp_no_default_args_list = e.pop("cpp_no_default_args", []) + assert isinstance(cpp_no_default_args_list, list) + cpp_no_default_args = set(cpp_no_default_args_list) + + use_const_ref_for_mutable_tensors = e.pop( + "use_const_ref_for_mutable_tensors", False + ) + assert isinstance(use_const_ref_for_mutable_tensors, bool) + + variants_s = e.pop("variants", "function") + assert isinstance(variants_s, str) + variants: Set[Variant] = set() + for v in variants_s.split(", "): + if v == "function": + variants.add(Variant.function) + elif v == "method": + variants.add(Variant.method) + else: + raise AssertionError(f"illegal variant {v}") + + manual_kernel_registration = e.pop("manual_kernel_registration", False) + assert isinstance( + manual_kernel_registration, bool + ), f"not a bool: {manual_kernel_registration}" + + manual_cpp_binding = e.pop("manual_cpp_binding", False) + assert isinstance(manual_cpp_binding, bool), f"not a bool: {manual_cpp_binding}" + + device_guard = e.pop("device_guard", True) + assert isinstance(device_guard, bool), f"not a bool: {device_guard}" + + device_check_s = e.pop("device_check", None) + assert device_check_s is None or isinstance( + device_check_s, str + ), f"not a str: {device_check_s}" + device_check: DeviceCheckType + if device_check_s is None: + device_check = DeviceCheckType.ExactSame + else: + device_check = DeviceCheckType[device_check_s] + + structured = e.pop("structured", False) + assert isinstance(structured, bool), f"not a bool: {structured}" + + structured_delegate_s = e.pop("structured_delegate", None) + assert structured_delegate_s is None or isinstance( + structured_delegate_s, str + ), f"not a str: {structured_delegate_s}" + assert structured_delegate_s is None or "::" not in structured_delegate_s, ( + "namespace is not supported in structured delegate," + " using the same namespace as the native function" + ) + structured_delegate: Optional[OperatorName] = None + if structured_delegate_s is not None: + structured_delegate = OperatorName.parse(structured_delegate_s) + + structured_inherits = e.pop("structured_inherits", None) + assert structured_inherits is None or isinstance( + structured_inherits, str + ), f"not a str: {structured_inherits}" + assert structured_inherits is None or "::" not in structured_inherits, ( + "namespace is not supported in structured inherits," + " using the same namespace as the native function" + ) + + python_module = e.pop("python_module", None) + assert python_module is None or isinstance( + python_module, str + ), f"not a str: {python_module}" + assert ( + python_module is None or Variant.method not in variants + ), "functions in modules cannot be methods" + + category_override = e.pop("category_override", None) + assert category_override is None or isinstance( + category_override, str + ), f"not a str: {category_override}" + + precomputed_dict = e.pop("precomputed", None) + assert precomputed_dict is None or structured is True + precomputed = Precompute.parse(precomputed_dict) if precomputed_dict else None + + tags_inp = e.pop("tags", []) + if isinstance(tags_inp, str): + tags_inp = [tags_inp] + assert isinstance(tags_inp, list) + + # All aten ops generated by torchgen receive the pt2_compliant tag. + if namespace == "aten" and "pt2_compliant_tag" in valid_tags: + tags_inp.append("pt2_compliant_tag") + + tags: Set[str] = set() + for t in tags_inp: + assert len(valid_tags) > 0 + # TODO: verify that the tag is valid and has an entry in tags.yaml + if t in valid_tags: + tags.add(t) + else: + raise AssertionError(f"illegal tag {t}") + + from torchgen.api import cpp + + raw_dispatch = e.pop("dispatch", None) + assert raw_dispatch is None or isinstance(raw_dispatch, dict), e + dispatch: Dict[DispatchKey, BackendMetadata] = {} + num_dispatch_keys: int = 0 + if raw_dispatch is not None: + assert not manual_kernel_registration, ( + "cannot specify both manual_kernel_registration and dispatch; with " + "manual registration, dispatch has no effect!" + ) + redundant_composite_implicit_autograd = False + for ks, v in raw_dispatch.items(): + if ks == "__line__": + continue # not worth tracking line numbers for dispatch entries + assert isinstance(ks, str), e + for k in ks.split(","): + dispatch_key = DispatchKey.parse(k.strip()) + num_dispatch_keys += 1 + + if ignore_keys and dispatch_key in ignore_keys: + continue + assert dispatch_key in dispatch_keys, ( + f"Dispatch key {dispatch_key} of kernel {v} " + "is not a supported dispatch key." + ) + # We only allow at most 3 levels of namespace for kernels. + # We will append "native" to a custom kernel namespace. + namespace_helper = NamespaceHelper.from_namespaced_entity( + v, max_level=3 + ) + kernel_namespace = namespace_helper.get_cpp_namespace(default="at") + # Why is 'structured' included? External backends (e.g. + # XLA) opt into which ops are structured independently + # of which in-tree ops are structured + dispatch[dispatch_key] = BackendMetadata( + kernel=namespace_helper.entity_name, + structured=structured + and is_structured_dispatch_key(dispatch_key), + cpp_namespace=(kernel_namespace + "::native"), + ) + if ( + dispatch_key is DispatchKey.CompositeImplicitAutograd + and v == cpp.name(func) + ): + redundant_composite_implicit_autograd = True + + # We count the number of dispatch keys which have not been ignored to prevent a dispatch table + # in which all backend keys are ignored but necessarily kept, remaining compositeimplicit, + # from being treated as redundant. + assert not ( + num_dispatch_keys == 1 and redundant_composite_implicit_autograd + ), ( + "unnecessary dispatch table for this function; just delete the dispatch " + "key entirely" + ) + # if a function is a structured delegate, deleting the dispatch + # table is NOT semantics preserving + assert ( + structured_delegate + or dispatch.keys() != {DispatchKey.CompositeImplicitAutograd} + or dispatch[DispatchKey.CompositeImplicitAutograd].supports_symint() + or num_dispatch_keys != 1 + ), ( + f"unexpected name for singleton CompositeImplicitAutograd dispatch entry: expected {cpp.name(func)} " + f"but got {dispatch[DispatchKey.CompositeImplicitAutograd]}. Rename your implementation to the expected " + "name, then delete the dispatch table" + ) + elif not structured and structured_delegate is None: + name = str(func.name.name) + assert not ( + name.startswith("new_") + or name.endswith("_like") + # TODO: maybe it's better to test the return + or ( + func.arguments.tensor_options + and not func.arguments.has_tensor_arg() + ) + ), ( + f"expected {name} to have a CompositeExplicitAutograd " + "dispatch entry, but there was no dispatch table. Factory functions " + "should not have implicit dispatch as they should not be decomposed " + "for __torch_dispatch__" + ) + dispatch[DispatchKey.CompositeImplicitAutograd] = BackendMetadata( + cpp.name(func), structured=False, cpp_namespace=DEFAULT_KERNEL_NAMESPACE + ) + + composites_in_dispatch = [ + d + for d in dispatch + if d == DispatchKey.CompositeExplicitAutograd + or d == DispatchKey.CompositeExplicitAutogradNonFunctional + or d == DispatchKey.CompositeImplicitAutograd + or d == DispatchKey.CompositeImplicitAutogradNestedTensor + ] + + assert len(composites_in_dispatch) <= 1 or ( + len(composites_in_dispatch) == 2 + and ( + DispatchKey.CompositeExplicitAutogradNonFunctional + not in composites_in_dispatch + ) + and ( + DispatchKey.CompositeImplicitAutogradNestedTensor + in composites_in_dispatch + ) + ), ( + "cannot specify more than one of CompositeExplicitAutograd, CompositeExplicitAutogradNonFunctional, " + "or CompositeImplicitAutograd on a single kernel; each " + "strictly subsumes the other. If you wanted to provide an explicit autograd " + "implementation, specify CompositeExplicitAutograd; otherwise specify CompositeImplicitAutograd only" + ) + + autogen_str = e.pop("autogen", "") + assert isinstance(autogen_str, str) + autogen = ( + [] + if autogen_str == "" + else [OperatorName.parse(x) for x in autogen_str.split(", ")] + ) + + raw_ufunc_inner_loop = e.pop("ufunc_inner_loop", {}) + ufunc_inner_loop = {} + if isinstance(raw_ufunc_inner_loop, str): + ufunc_inner_loop[UfuncKey.Generic] = UfuncInnerLoop.parse( + raw_ufunc_inner_loop, UfuncKey.Generic + ) + elif isinstance(raw_ufunc_inner_loop, dict): + for k, vo in raw_ufunc_inner_loop.items(): + if k == "__line__": + continue + assert isinstance(k, str), f"ufunc_inner_loop key is not a str: {k}" + assert isinstance(vo, str), f"ufunc_inner_loop value is not a str: {v}" + ufunc_key = UfuncKey.parse(k) + ufunc_inner_loop[ufunc_key] = UfuncInnerLoop.parse(vo, ufunc_key) + else: + raise AssertionError( + f"ufunc_inner_loop not str or dict: {raw_ufunc_inner_loop}" + ) + # Program the BackendIndex for the implicit dispatch entry from ufunc + if ufunc_inner_loop: + assert structured, "ufunc must be structured" + + # Delay import ufunc here to avoid circular import issue + # See: https://github.com/pytorch/pytorch/issues/81294 + import torchgen.api.ufunc as ufunc + + for dispatch_key in UFUNC_DISPATCH_KEYS: + assert ( + dispatch_key not in dispatch + ), f"ufunc should not have explicit dispatch entry for {dispatch_key}" + dispatch[dispatch_key] = BackendMetadata( + kernel=ufunc.schema_kernel_name(func, dispatch_key), + structured=True, + cpp_namespace=DEFAULT_KERNEL_NAMESPACE, + ) + + if structured_delegate: + # Structured functions MUST have a dispatch table + is_abstract = True + else: + is_abstract = ( + dispatch.keys() != {DispatchKey.CompositeImplicitAutograd} + and dispatch.keys() + != {DispatchKey.CompositeImplicitAutogradNestedTensor} + and dispatch.keys() + != { + DispatchKey.CompositeImplicitAutograd, + DispatchKey.CompositeImplicitAutogradNestedTensor, + } + ) + + has_composite_implicit_autograd_kernel = ( + DispatchKey.CompositeImplicitAutograd in dispatch.keys() + ) + has_composite_implicit_autograd_nested_tensor_kernel = ( + DispatchKey.CompositeImplicitAutogradNestedTensor in dispatch.keys() + ) + has_composite_explicit_autograd_kernel = ( + DispatchKey.CompositeExplicitAutograd in dispatch.keys() + ) + has_composite_explicit_autograd_non_functional_kernel = ( + DispatchKey.CompositeExplicitAutogradNonFunctional in dispatch.keys() + ) + + # We aren't going to store dispatch metadata inline in NativeFunctions; + # instead it is separately indexed by backend (so other backends can + # add more dispatch entries after the fact). Reindex the individual + # metadata by OperatorName! + backend_metadata = {k: {func.name: v} for k, v in dispatch.items()} + + # don't care if it exists or not; make it easier to use this function + # with other yaml parsers that aren't setting __line__ in the dict + e.pop("__line__", None) + assert not e, f"leftover entries: {e}" + + # Asserts that we can't do in post_init, because they rely on backend-specific info + if structured_delegate is not None: + for key in STRUCTURED_DISPATCH_KEYS: + assert key not in dispatch, ( + f"if structured_delegate, then must not have {key} in dispatch dictionary " + "(it is delegated!)" + ) + + return ( + NativeFunction( + func=func, + use_const_ref_for_mutable_tensors=use_const_ref_for_mutable_tensors, + variants=variants, + structured=structured, + structured_delegate=structured_delegate, + structured_inherits=structured_inherits, + precomputed=precomputed, + autogen=autogen, + ufunc_inner_loop=ufunc_inner_loop, + manual_kernel_registration=manual_kernel_registration, + manual_cpp_binding=manual_cpp_binding, + python_module=python_module, + category_override=category_override, + device_guard=device_guard, + device_check=device_check, + loc=loc, + cpp_no_default_args=cpp_no_default_args, + is_abstract=is_abstract, + has_composite_implicit_autograd_kernel=has_composite_implicit_autograd_kernel, + has_composite_implicit_autograd_nested_tensor_kernel=has_composite_implicit_autograd_nested_tensor_kernel, + has_composite_explicit_autograd_kernel=has_composite_explicit_autograd_kernel, + has_composite_explicit_autograd_non_functional_kernel=has_composite_explicit_autograd_non_functional_kernel, + tags=tags, + namespace=namespace, + ), + backend_metadata, + ) + + def validate_unstructured(self) -> None: + # TODO: probably better to accumulate these errors and report them all + # at once + assert not self.structured, ( + "This function is structured, but there was " + "no valid functional variant of it." + ) + assert self.structured_delegate, ( + "This function delegates to another structured out function, " + "but no valid function was found (the delegate may not exist, or it has the wrong type)" + ) + + # __post_init__ functions in dataclasses can be used to do extra + # validation after construction. + # + # Notice that we don't do any type validation here. In fact, we + # rely exclusively on mypy to check if you've done types correctly! + # Validation is for nontrivial invariants that cannot be (conveniently) + # encoded in the type system. + def __post_init__(self) -> None: + if self.func.arguments.out: + assert self.variants == {Variant.function}, ( + "Native functions with out arguments MUST " + "be declared with only function variant; e.g., variants: function; " + "otherwise you will tickle a Python argument binding bug " + "(which usually manifests itself as the result variable being undefined.)" + ) + if self.structured: + assert self.func.kind() == SchemaKind.out, ( + "Put structured field on the out= " + "variant of a function; did you mean structured_delegate?" + ) + assert ( + self.device_guard + ), "device_guard: False is not respected by structured kernels" + if self.structured_delegate: + assert self.func.kind() != SchemaKind.out, ( + "structured_delegate field not allowed " + "on out= functions; did you mean structured?" + ) + assert ( + self.device_guard + ), "device_guard: False is not respected by structured kernels" + # Technically, with the asserts above, this assert is impossible to + # happen + assert not ( + self.structured and self.structured_delegate + ), "Cannot have both structured and structured_delegate on function" + defaulted_arguments = { + a.name for a in self.func.schema_order_arguments() if a.default is not None + } + invalid_args = set.difference(self.cpp_no_default_args, defaulted_arguments) + assert len(invalid_args) == 0, f"Invalid cpp_no_default_args: {invalid_args}" + if self.structured_inherits is not None: + assert ( + self.structured + ), "structured_inherits must also imply structured: True" + if str(self.func.name).startswith("_foreach"): + assert self.device_check == DeviceCheckType.NoCheck, ( + "foreach kernels fall back to slow path when tensor are on different devices, " + "device_check not allowed to be enabled" + ) + + # NB: if your function accidentally has rand/dropout/... in its name + # but is not actually random, feel free to amend this to special case + if ( + "rand" in str(self.func.name) + or ( + ( + "dropout" in str(self.func.name) + or any( + "dropout" in arg.name for arg in self.func.arguments.flat_all + ) + ) + # Backwards of dropout is typically deterministic + and "backward" not in str(self.func.name) + and str(self.func.name.name) not in ["_cudnn_init_dropout_state"] + ) + or self.func.arguments.has_generator_arg() + ): + assert "nondeterministic_seeded" in self.tags, str(self.func.name) + + @property + def has_composite_kernel(self) -> bool: + return ( + self.has_composite_implicit_autograd_kernel + or self.has_composite_explicit_autograd_kernel + or self.has_composite_explicit_autograd_non_functional_kernel + ) or ( + self.has_composite_implicit_autograd_kernel + and self.has_composite_implicit_autograd_nested_tensor_kernel + ) + + @property + def is_view_op(self) -> bool: + rets = self.func.returns + is_non_mutating_view = len(rets) > 0 and any( + r.annotation is not None and not r.annotation.is_write for r in rets + ) + # See Note [resize_ in Functionalization] for more dtails + is_inplace_view = ( + "inplace_view" in self.tags + and str(self.func.name) != "resize_" + and str(self.func.name) != "resize_as_" + ) + is_wildcard_view = any( + inp.annotation is not None and "*" in inp.annotation.alias_set_after + for inp in self.func.schema_order_arguments() + ) + return is_non_mutating_view or is_inplace_view or is_wildcard_view + + @property + def view_schema_kind(self) -> ViewSchemaKind: + if self.is_view_op and self.func.name.name.inplace: + assert "inplace_view" in self.tags + return ViewSchemaKind.aliasing_inplace + if self.is_view_op: + return ViewSchemaKind.aliasing + else: + return ViewSchemaKind.non_aliasing + + @property + def root_name(self) -> str: + return self.func.name.name.base + + @property + def part_of_structured_group(self) -> bool: + return self.structured or self.structured_delegate is not None + + +class SchemaKind(Enum): + functional = auto() + inplace = auto() + out = auto() + mutable = auto() + scratch = auto() + + +# A structured kernel is guaranteed to have a functional and out variant, and +# optionally an inplace variant. +# +# NB: we create NativeFunctionsGroup *even if* the function is not +# actually annotated structured. Test the structured boolean to see if it +# actually is structured or not. +@dataclass(frozen=True) +class NativeFunctionsGroup: + functional: NativeFunction + inplace: Optional[NativeFunction] + mutable: Optional[NativeFunction] + out: NativeFunction + + @property + def structured(self) -> bool: + # Whether or not the operator has a meta() function. This information is backend-agnostic. + return self.out.structured + + def __post_init__(self) -> None: + test_sig: FunctionSchema = self.functional.func.signature() + for f in self.functions(): + if test_sig != f.func.signature(): + raise AssertionError( + "NativeFunctionsGroup constructed from two NativeFunctions " + f"that don't have matching signatures: {test_sig} != {f.func.signature()}" + ) + + if self.structured != f.part_of_structured_group: + raise AssertionError( + "NativeFunctionsGroup constructed from structured and unstructured " + f"functions: {self.out.func.name} and {f.func.name}" + ) + assert self.functional.func.kind() == SchemaKind.functional + assert self.out.func.kind() == SchemaKind.out + assert self.functional.namespace == self.out.namespace + if self.inplace is not None: + assert self.inplace.func.kind() == SchemaKind.inplace + assert self.inplace.namespace == self.functional.namespace + + if self.mutable is not None: + assert self.mutable.func.kind() == SchemaKind.mutable + assert self.mutable.namespace == self.functional.namespace + # See Note [Overload Ambiguity With Functional Variants] + assert self.functional.func.name.name.functional_overload + + if self.structured: + # For now, structured composite kernels are not supported (need some + # design work to figure out how to make the composite case work) + assert ( + not self.out.has_composite_implicit_autograd_kernel + and not self.out.has_composite_implicit_autograd_nested_tensor_kernel + ) + + assert self.functional.structured_delegate == self.out.func.name, ( + f"{self.functional.func.name} delegates to {self.functional.structured_delegate} " + f"but its actual delegate is {self.out.func.name}" + ) + if self.inplace is not None: + assert self.inplace.structured_delegate == self.out.func.name + + generated_fns = sorted( + [str(f.func.name) for f in self.functions() if "generated" in f.tags] + ) + generated_fns_str = ", ".join(str(x) for x in generated_fns) + expected_generated_fns: Set[str] = set() + for f in self.functions(): + expected_generated_fns.update(str(op) for op in f.autogen) + expected_generated_fns_str = ", ".join( + str(x) for x in sorted(expected_generated_fns) + ) + if len(expected_generated_fns) == 0 and len(generated_fns) > 0: + raise RuntimeError( + f"The codegen expects to be able to generate '{generated_fns_str}'." + " In order to generate them however, we expect them to be called out explicitly in the yaml." + f" Please add an 'autogen: {generated_fns_str}' line to the entry for {str(f.func.name)}" + ) + if expected_generated_fns_str != generated_fns_str: + raise RuntimeError( + f"The codegen expects to be able to generate '{generated_fns_str}'." + f" To do so, it expects a line: 'autogen: {generated_fns_str}'." + f" Instead, it found 'autogen: {expected_generated_fns_str}'" + ) + + def signature(self) -> "FunctionSchema": + return self.out.func.signature() + + def functions(self) -> Iterator[NativeFunction]: + yield self.functional + yield self.out + if self.inplace is not None: + yield self.inplace + if self.mutable is not None: + yield self.mutable + + @property + def root_name(self) -> str: + return self.functional.root_name + + @staticmethod + def from_dict( + d: Dict[SchemaKind, NativeFunction] + ) -> Optional["NativeFunctionsGroup"]: + assert d + if len(d) == 1: + return None + d = dict(d) # non-destructive updates please + functional = d.pop(SchemaKind.functional, None) + inplace = d.pop(SchemaKind.inplace, None) + mutable = d.pop(SchemaKind.mutable, None) + out = d.pop(SchemaKind.out, None) + assert not d + assert functional is not None + # There are a few operators which only have functional/inplace variants; + # these don't count as structured for our purposes here + if out is None: + return None + # assuming all variants have the same namespace + return NativeFunctionsGroup( + functional=functional, + inplace=inplace, + mutable=mutable, + out=out, + ) + + +@dataclass(frozen=True) +class BackendMetadata: + # The name of the backend kernel, for a given operator + # for in-tree backends. These names come directly from the 'dispatch" field + # in native_functions.yaml. The dispatch entry is optional; in that + # case, that is equivalent to having written: + # + # dispatch: + # CompositeImplicitAutograd: $operator_name + kernel: str + # Whether or not the operator has a structured kernel implemented, for this particular backend. + # For in-tree backends, they all have the same value for structured- this is listed + # in native_functions.yaml. + # However, external backends like XLA can indendently toggle which ops are structured. + structured: bool + + # The namespace for kernels, default value: DEFAULT_KERNEL_NAMESPACE + cpp_namespace: str + + def supports_symint(self) -> bool: + return "_symint" in self.kernel + + +@dataclass(frozen=True) +class UfuncInnerLoop: + name: str + supported_dtypes: OrderedSet[ScalarType] + # key is stored here because it affects the semantics of name, + # so its helpful to have them together for further processing + ufunc_key: UfuncKey + + @staticmethod + def parse(value: str, ufunc_key: UfuncKey) -> "UfuncInnerLoop": + name, supported_dtypes_str = value.split(" ", 1) + assert supported_dtypes_str[0] == "(" + assert supported_dtypes_str[-1] == ")" + supported_dtypes: OrderedSet[ScalarType] = OrderedSet() + for k in supported_dtypes_str[1:-1].split(", "): + supported_dtypes |= ScalarType.parse_set(k) + return UfuncInnerLoop( + name=name, supported_dtypes=supported_dtypes, ufunc_key=ufunc_key + ) + + +# BackendIndex represents a backend. +# The BackendIndex encodes per-operator information that is potentially different +# for each backend. The most obvious example is the name of the kernel +# (the 'dispatch' entry in native_functions.yaml). +# However, there can be other examples of different backends having different information. +# External backends can choose to opt their kernels to be structured independently from in-tree backends, +# which means that this information isn't inherently tied to a NativeFunction- it's different per backend. +@dataclass(frozen=True) +class BackendIndex: + dispatch_key: DispatchKey + # Mainly important for structured kernels, this determines which variant in the operator group is used to implement the others. + # All in-tree ops use out kernels, while XLA uses functional kernels. + use_out_as_primary: bool + # Whether the backend requires a device guard, and device checks. + # For in-tree backends, this is currently just CUDA/HIP + # For out-of-tree backends, this is currently just Intel XPU + device_guard: bool + # Whether the backend is in-tree (CPU/CUDA) or out-of-tree (XLA) + external: bool + # Other backend-specific information that is on a per-operator basis + index: Dict["OperatorName", BackendMetadata] + + @staticmethod + def grow_index( + parent_index: Dict[DispatchKey, Dict["OperatorName", BackendMetadata]], + child_index: Dict[DispatchKey, Dict["OperatorName", BackendMetadata]], + ) -> None: + for k, v in child_index.items(): + for op_name, metadata in v.items(): + assert ( + op_name not in parent_index[k] + ), f"duplicate operator {op_name} for dispatch key {k}" + parent_index[k][op_name] = metadata + + def primary(self, g: NativeFunctionsGroup) -> NativeFunction: + if self.use_out_as_primary: + return g.out + else: + return g.functional + + def has_kernel(self, g: Union[NativeFunction, NativeFunctionsGroup]) -> bool: + m = self.get_kernel(g) + return m is not None + + def get_kernel( + self, g: Union[NativeFunction, NativeFunctionsGroup] + ) -> Optional[BackendMetadata]: + if isinstance(g, NativeFunction): + f = g + elif isinstance(g, NativeFunctionsGroup): + f = self.primary(g) + else: + assert_never(g) + if f.func.name not in self.index: + return None + return self.index[f.func.name] + + def native_function_class_name(self) -> Optional[str]: + if self.external: + return f"{str(self.dispatch_key)}NativeFunctions" + else: + # TODO: This discrepancy isn't required; we could also generated + # a class for in-tree kernels. It'll just require carefully + # updating every kernel definition + callsite of every in-tree aten kernel. + return None + + +# The function schema is undoubtedly the most important data structure +# in all of the codegen, as it defines the type signature for operators, +# and most of the code generation we do is type directed (e.g., look at +# the types, decide what to do. Think about how we code generate +# C++ function stubs!) +# +# We will also see in this class the general structure for how we model +# data in this code generation. A few notable properties to point out +# ahead of time: +# +# - These dataclasses are a *lossless* representation of the strings +# they are parsed from. In fact, we assert that given the +# information stored in the dataclass, we can exactly reconstruct +# the string we parsed from (and assert this inside the parse +# definition). There are a few reasons for this: +# +# - If you find that it is difficult to reconstruct the string +# given a dataclass, that is a clue that you are data +# representation is wrong. +# +# - It helps ensure that all relevant information is present +# in the dataclass, so that downstream users aren't tempted +# to reparse the original string to get some information +# that was omitted. +# +# - It forces you to represent the data in-memory in the same way +# it is recorded textually, which makes the dataclasses easier +# to understand for someone who is familiar with the +# textual format. (As a tradeoff, it means you have to model +# the syntax, even when it is inconvenient. But maybe that means +# the syntax is bad!) If you don't understand the internal +# representation, go look at the printing code to see how +# it maps onto the surface syntax! +# +# - It makes it easy to test the parsing code, as parsing code +# that is inconsistent with the string code will fail early +# and loudly. (As a tradeoff, it makes the parsing code a bit +# brittle (in particular, with trivial whitespace changes you +# are likely to trigger an assert error). +# +# In general, try to make the __str__ code as simple as possible +# (even at the cost of more complex parsing logic.) Additionally, +# try to minimize redundancy in data representation. (Precomputed +# fields are OK though: they are defined as a simple function on +# the canonical representation in question.) +# +# - These dataclasses are all frozen; once constructed their +# values never change. This makes it easy to tell where any +# given data came from: just look to the constructor. As a +# tradeoff, you can't easily "decorate" a schema with extra +# information from a post-facto analysis. We impose this +# restriction to make these structures more understandable. +# +@dataclass(frozen=True) +class FunctionSchema: + # The name of the operator this function schema describes. + name: "OperatorName" + + arguments: "Arguments" + + # TODO: Need to handle collisions with argument names at some point + returns: Tuple["Return", ...] + + def schema_order_arguments(self) -> Iterator["Argument"]: + return itertools.chain( + self.arguments.flat_positional, + self.arguments.flat_kwarg_only, + self.arguments.out, + ) + + decl_re = re.compile(r"(?P[^\(]+)\((?P.*)\) -> (?P.*)") + + @staticmethod + def parse(func: str) -> "FunctionSchema": + # We should probably get a proper parser here + decls = FunctionSchema.decl_re.findall(func) + assert len(decls) == 1, f"Invalid function schema: {func}" + ops, args, return_decl = decls[0] + name = OperatorName.parse(ops) + arguments = Arguments.parse(args) + returns = parse_returns(return_decl) + r = FunctionSchema(name=name, arguments=arguments, returns=returns) + assert str(r) == func, f"{str(r)} != {func}" + return r + + def returns_are_aliased(self) -> bool: + # We assert earlier that schemas can't have a mix of aliased and non-aliased returns + return any( + r + for r in self.returns + if r.annotation is not None and r.annotation.is_write + ) + + def __post_init__(self) -> None: + for arg, ret in zip(self.arguments.out, self.returns): + assert arg.annotation == ret.annotation, ( + "Out arguments must have matching return Tensor; furthermore, " + "the ith-argument needs to correspond to the ith return" + ) + # We also enforce that if you have any mutable, positional args, then they are not returned. + # This makes it easier to group these functions properly with their functional/out= counterparts. + for a in self.arguments.post_self_positional_mutable: + assert not any( + a.annotation == r.annotation for r in self.returns + ), f"If you have a schema with mutable positional args, we expect them to not be returned. schema: {str(self)}" + # Invariant: we expect out arguments to appear as keyword arguments in the schema. + # This means that all mutable returns should be aliased to a keyword argument + # (except for "self", which we explicitly don't treat as an out argument because of its use in methods) + # See Note [is_out_fn] + out_and_self = list(self.arguments.out) + [ + arg for arg in self.arguments.flat_positional if arg.name == "self" + ] + mutable_returns = [ + ret + for ret in self.returns + if ret.annotation is not None and ret.annotation.is_write + ] + immutable_returns = [ + ret + for ret in self.returns + if ret.annotation is None or not ret.annotation.is_write + ] + # Some assertions: We don't want any functions with a return type of "-> (Tensor(a!), Tensor)", + # because: + # (1) It's more annoying to handle properly + # (2) It's unnecessary - you can't method-chain on the first (mutated) output because it's part of a tuple. + # Instead, we expect the (a!) argument to not be returned. + assert ( + len(mutable_returns) == 0 or len(immutable_returns) == 0 + ), f"NativeFunctions must have either only mutable returns, or only immutable returns. Found: {str(self)}" + for ret in mutable_returns: + assert any(ret.annotation == arg.annotation for arg in out_and_self), ( + 'All mutable returns must be aliased either to a keyword argument, or to "self". ' + "Did you forget to mark an out argument as keyword-only?" + ) + if self.arguments.out: + # out= ops that return their mutable inputs are only really useful for method chaining. + # And method chaining is only really useful if the thing you're returning is a plain Tensor. + # So ideally, we'd enforce that out= ops with a single plain mutable tensor should return the tensor, + # and all other types of out= op schemas should return void. + # There are a bunch of existing out= ops that return tuples of tensors though, so we're stuck with allowing that. + if any(a.type != BaseType(BaseTy.Tensor) for a in self.arguments.out): + assert ( + len(self.returns) == 0 + ), "out= ops that accept tensor lists as out arguments " + "are expected to have no return type (since you can't do method chaining on them)" + else: + # mutable keyword arguments whose name has _scratch_ prefix are + # scratch tensors for memory planning and should not be returned + assert len( + [ + arg + for arg in self.arguments.out + if not arg.name.startswith("_scratch_") + ] + ) == len( + self.returns + ), "Must return as many arguments as there are out arguments, or no return at all" + + if self.name.name.inplace: + self_a = self.arguments.self_arg + assert ( + self_a + and self_a.argument.annotation + and self_a.argument.annotation.is_write + ) + if self_a.argument.type == BaseType(BaseTy.Tensor): + # All inplace ops with an ordinary `Tensor self` argument should return self, + # to allow for method chaining. + assert ( + len(self.returns) == 1 + and self.returns[0].annotation == self_a.argument.annotation + ) + else: + # You can't method chain on non-tensor self arguments though (like a List[Tensor]) + # so in all other cases we expect the return type to be none. + assert len(self.returns) == 0 + + if self.arguments.tensor_options is not None: + assert self.kind() == SchemaKind.functional, ( + "Found an operator that is not functional or out variant, but has tensor options arguments." + "This is not allowed- tensor options arguments are only allowed for factory functions." + f"schema: {str(self)}" + ) + if self.is_functional_fn(): + assert self.kind() == SchemaKind.functional, ( + "Found an operator that is not functional, but its overload contains the string 'functional'." + "This is a special keyword in the codegen, please use a different overload name." + f"schema: {str(self)}" + ) + + def is_functional_fn(self) -> bool: + return "functional" in self.name.overload_name + + def is_out_fn(self) -> bool: + # Note [is_out_fn] + # + # out functions are the variants which take an explicit out= argument + # to populate into. We need to know if a schema corresponds to an + # out function for several reasons: + # + # - They codegen differently in C++ API + # - codegen to at::add_out rather than at::add + # - out argument is moved to front of C++ argument list + # + # out functions are DEFINED to be any function with a keyword-only + # argument that is mutable. In principle, this could lead to a + # false positive if you define a function that mutates a + # kwarg only argument, but this isn't the "true" output of this + # function. A more robust definition that would work in this + # case would also look at: + # + # - The output types. Out functions take in the arguments + # they mutate and then return them again; this is sort + # of "definitionally" what makes something an out function. + # Historically, we DO check this for consistency. + # - Correspondence with pure variant. An out function + # should have a signature equivalent to its pure variant, + # but just with extra kwargs for the output elements. This + # is difficult to actually check for and historically + # we only do this check in tools/ + return bool(self.arguments.out) + + def kind(self) -> SchemaKind: + """ + What kind of schema is this? A functional schema is one + that returns a newly allocated output; an inplace schema + modifies the self argument inplace; an out schema writes + the result into an explicitly provided out argument. + """ + is_out = bool(self.arguments.out) + is_scratch = bool( + [arg for arg in self.arguments.out if arg.name.startswith("_scratch_")] + ) + is_inplace = self.name.name.inplace + is_mutable = any( + a.annotation is not None and a.annotation.is_write + for a in self.arguments.post_self_positional + ) + assert not (is_out and is_inplace) + # out= and inplace schemas can also have post_self_positional mutable args, + # but we give precedence to out= and inplace when deciding the schema kind. + # Tradeoff: we probably don't want to have to teach codegen that looks at inplace ops + # to also worry about mutable post_self_positional arguments, + # but it seems like a much bigger lift to classify them has having a new schema kind. + # The number of ops that fit in this strange category is small enough that + # we can probably manually write code for them instead of forcing the codegen to handle them. + if is_inplace: + return SchemaKind.inplace + elif is_scratch: + assert ( + is_out + ), "invariant: all scratch operators are expected to be out= operators too" + return SchemaKind.scratch + elif is_out: + assert ( + not is_scratch + ), "We should not categorize a scratch op as an out variant. Check if the order of if statements are expected!" + return SchemaKind.out + elif is_mutable: + return SchemaKind.mutable + else: + return SchemaKind.functional + + # For every return: + # - If the return aliases an input, we return the input name + # - Otherwise, we return None. + # If return names were enforced to be consistent with aliasing information, then we wouldn't need this. + def aliased_return_names(self) -> List[Optional[str]]: + outs: List[Optional[str]] = [] + for r in self.returns: + aliased_args = [ + a + for a in self.arguments.flat_all + if a.annotation is not None and a.annotation == r.annotation + ] + if len(aliased_args) == 0: + outs.append(None) + elif len(aliased_args) == 1: + outs.append(aliased_args[0].name) + else: + aliased_names = ", ".join(a.name for a in aliased_args) + raise AssertionError( + f"Found a return ({r.name})that aliases multiple inputs ({aliased_names})" + ) + return outs + + def signature( + self, + *, + strip_default: bool = False, + strip_view_copy_name: bool = False, + keep_return_names: bool = False, + ) -> "FunctionSchema": + """ + Certain schemas are 'related', in that they are simply + inplace/out/functional versions of the same function. This method + factors these schemas into the "core" functional signature which + is equal across all versions. + + Here is what normalization happens to the schema to convert + it to a signature: + - The overload name is stripped (name is retained, since + it expresses semantic content about what the function does) + - Inplace is set False + - Out arguments are stripped + - Mutable post_self_positional args are converted to returns + - Mutability annotations are stripped (this is sound + because you cannot overload on mutability annotation) + - Return names are stripped since they are not overloadable and + some variants have return names but some not + - TensorOptions are dropped + because out= variants of factory functions don't include them + (and we want to be able to pair up factory functions with their out variants) + + Finally, we want to be able to pair up related "view" and their + corresponding "view_copy" operators. We do this by optionally + stripping the trailing "_copy" from the base name. + + Example of a mutable op before and after: + + f.func (Mutable operator): + _fused_moving_avg_obs_fq_helper(Tensor self, Tensor observer_on, Tensor fake_quant_on, Tensor(a!) running_min, Tensor(b!) running_max, Tensor(c!) scale, Tensor(d!) zero_point, float averaging_const, int quant_min, int quant_max, int ch_axis, bool per_row_fake_quant=False, bool symmetric_quant=False) -> (Tensor output, Tensor mask) # noqa: B950 + + f.func (Corresponding functional operator): + _fused_moving_avg_obs_fq_helper.functional(Tensor self, Tensor observer_on, Tensor fake_quant_on, Tensor running_min, Tensor running_max, Tensor scale, Tensor zero_point, float averaging_const, int quant_min, int quant_max, int ch_axis, bool per_row_fake_quant=False, bool symmetric_quant=False) -> (Tensor output, Tensor mask, Tensor running_min_out, Tensor running_max_out, Tensor scale_out, Tensor zero_point_out) # noqa: B950 + + f.func.signature() output: + _fused_moving_avg_obs_fq_helper(Tensor self, Tensor observer_on, Tensor fake_quant_on, Tensor running_min, Tensor running_max, Tensor scale, Tensor zero_point, float averaging_const, int quant_min, int quant_max, int ch_axis, bool per_row_fake_quant=False, bool symmetric_quant=False) -> (Tensor, Tensor, Tensor, Tensor, Tensor, Tensor) # noqa: B950 + """ + + def strip_ret_annotation(r: Return) -> Return: + return Return( + name=r.name if keep_return_names else None, + type=r.type, + annotation=None, + ) + + base_name = self.name.name.base + if strip_view_copy_name: + if base_name.endswith("_copy"): + base_name = base_name.replace("_copy", "") + elif base_name.endswith("_scatter"): + base_name = base_name.replace("scatter", "inverse") + + # find mutable inputs that are not originally returned, and convert them to returns + returns_from_mutable_inputs = tuple( + # When we're grouping functions we strip the return names, + # but when we're generating the actual functional variants then we follow + # a convention for what to name the returns + Return( + name=f"{a.name}_out" if keep_return_names else None, + type=a.type, + annotation=None, + ) + for a in itertools.chain( + # Order is important here (otherwise e.g. inplace with mutable args + # and out= with mutable args won't have the same signature) + [self.arguments.self_arg.argument] + if self.arguments.self_arg is not None + else [], + self.arguments.out, + self.arguments.post_self_positional, + ) + if a.annotation is not None + and a.annotation.is_write + and not any(a.annotation == r.annotation for r in self.returns) + ) + original_returns = tuple(map(strip_ret_annotation, self.returns)) + # Ordering is important here. We expect the "mutable input" returns to come last. + returns = original_returns + returns_from_mutable_inputs + + args_sig = self.arguments.signature(strip_default=strip_default) + # See Note [bernoulli.p schema] + if str(self.name) == "bernoulli.p": + args_sig = Arguments.parse(str(args_sig).replace("float p", "float p=0.5")) + + return FunctionSchema( + name=OperatorName( + name=BaseOperatorName( + base=base_name, + inplace=False, + dunder_method=self.name.name.dunder_method, + ), + overload_name="", # stripped + ), + arguments=args_sig, + returns=returns, + ) + + def view_signature(self) -> "FunctionSchema": + return self.signature(strip_view_copy_name=True) + + def with_name(self, name: "OperatorName") -> "FunctionSchema": + return FunctionSchema( + name=name, + arguments=self.arguments, + returns=self.returns, + ) + + @property + def modifies_arguments(self) -> bool: + return self.kind() in [SchemaKind.inplace, SchemaKind.out, SchemaKind.mutable] + + def has_symint(self) -> bool: + return self.arguments.has_symint_arg() + + def __str__(self) -> str: + all_arguments_str = str(self.arguments) + if len(self.returns) == 1: + returns = str(self.returns[0]) # omit parentheses + else: + returns = "(" + ", ".join(map(str, self.returns)) + ")" + return f"{self.name}({all_arguments_str}) -> {returns}" + + +# Here is the rest of the data model, described more briefly. + + +# Simplified version for what actually shows up in built-ins. +# Look at alias_info.h for expanded syntax. If you need the structure, +# you also need to make this structure recursive so it can be lined +# up with the type components too. For primitives this isn't really +# necessary +@dataclass(frozen=True) +class Annotation: + # Typically only has one element. Not actually a set so + # we can conveniently assume it is canonically ordered + alias_set: Tuple[str, ...] + is_write: bool + alias_set_after: Tuple[str, ...] + + @staticmethod + def parse(ann: str) -> "Annotation": + # TODO: implement a proper parser if this gets more ugly + # Regex Explanation: + # Example: "a! -> a|b" + # Group #1: alias before optional '|', required. Matches the first + # character 'a' in the example + # Group #2: optional alias set after optional '|', matches empty string + # in the example + # Group #3: optional "is write" flag, matches '!' in the example. + # Group #4: optional section containing arrow, matches " -> a|b" in the + # example. + # Group #5: optional alias after set, supports wildcard, matches "a|b" + # in the example. + # Group #6: optional sub-section of alias after set, matches "|b" in the + # example. + m = re.match(r"^([a-z])(\|[a-z])*(!?)( -> (\*|[a-z](\|[a-z])*))?$", ann) + + assert m is not None, f"unrecognized alias annotation {ann}" + before_alias = m.group(1) + (m.group(2) if m.group(2) else "") + alias_set = tuple(before_alias.split("|")) + is_write = m.group(3) == "!" + assert not ( + is_write and len(alias_set) > 1 + ), f"alias set larger than 1 is not mutable, got {ann} instead." + after_set = tuple(m.group(5).split("|")) if m.group(5) else tuple() + assert not ( + len(before_alias) > 1 and len(after_set) > 1 + ), f"before alias set and after alias set cannot be larger than 1 at the same time, got {ann} instead." + r = Annotation( + alias_set=alias_set, is_write=is_write, alias_set_after=after_set + ) + assert str(r) == ann, f"{r} != {ann}" + return r + + def __str__(self) -> str: + alias_set = "|".join(self.alias_set) + if self.is_write: + alias_set = f"{alias_set}!" + alias_set_after = "|".join(self.alias_set_after) + if alias_set_after: + alias_set = f'{alias_set}{" -> "}{alias_set_after}' + return alias_set + + +# The base class for the type system. This is also loosely modeled +# off of jit_type.h, but we've simplified the hierarchy to focus +# in on the aspects of the type system that matter for code generation +# (for example, there's no SingleElementType subclass anymore). +# You never actually construct a Type; usually it's going to be one +# of the subclasses. If Python had ADTs this would be one! +@dataclass(frozen=True) +class Type: + @staticmethod + def parse(t: str) -> "Type": + r = Type._parse(t) + assert str(r) == t, f"{r} != {t}" + return r + + @staticmethod + def _parse(t: str) -> "Type": + m = re.match(r"^(.+)\?$", t) + if m is not None: + return OptionalType(Type.parse(m.group(1))) + m = re.match(r"^(.+)\[([0-9]+)?\]$", t) + if m is not None: + size = int(m.group(2)) if m.group(2) is not None else None + return ListType(elem=Type.parse(m.group(1)), size=size) + + # '__torch__.torch.classes.' is the prefix for custom class + m = re.match(r"^__torch__\.torch\.classes\.([a-zA-Z0-9_.]+)$", t) + if m is not None: + return CustomClassType(m.group(1)) + try: + return BaseType(BaseTy[t]) + except KeyError as e: + raise RuntimeError(f"unrecognized type {t}") from e + + def __str__(self) -> str: + raise NotImplementedError + + # WARNING: These concepts are not very well-defined. For example, + # is "int?" nullable? How about "int?[]". They are defined + # so we can conveniently generate legacy Declarations.yaml but + # really we should probably just remove these at some point + + def is_base_ty_like(self, base_ty: "BaseTy") -> bool: + raise NotImplementedError + + def is_tensor_like(self) -> bool: + return self.is_base_ty_like(BaseTy.Tensor) + + def is_generator_like(self) -> bool: + return self.is_base_ty_like(BaseTy.Generator) + + def is_symint_like(self) -> bool: + return self.is_base_ty_like(BaseTy.SymInt) + + def is_nullable(self) -> bool: + raise NotImplementedError + + def is_list_like(self) -> Optional["ListType"]: + raise NotImplementedError + + +# Base types are simple, atomic types with no further structure +class BaseTy(Enum): + Generator = auto() + ScalarType = auto() + Tensor = auto() + int = auto() + Dimname = auto() + DimVector = auto() + float = auto() + str = auto() + bool = auto() + Layout = auto() + Device = auto() + DeviceIndex = auto() + Scalar = auto() + MemoryFormat = auto() + QScheme = auto() + Storage = auto() + Stream = auto() + SymInt = auto() + ConstQuantizerPtr = auto() # TODO: rename + + +@dataclass(frozen=True) +class BaseType(Type): + name: BaseTy + + def __str__(self) -> str: + return f"{self.name.name}" + + def is_base_ty_like(self, base_ty: BaseTy) -> bool: + return self.name == base_ty + + def is_nullable(self) -> bool: + return False + + def is_list_like(self) -> Optional["ListType"]: + return None + + def is_symint_like(self) -> bool: + return self.name == BaseTy.SymInt + + +# Optional types may be specified, or may also be validly given None +@dataclass(frozen=True) +class OptionalType(Type): + elem: Type + + def __str__(self) -> str: + return f"{self.elem}?" + + def is_base_ty_like(self, base_ty: BaseTy) -> bool: + return self.elem.is_base_ty_like(base_ty) + + def is_symint_like(self) -> bool: + return self.elem.is_symint_like() + + def is_nullable(self) -> bool: + return True + + def is_list_like(self) -> Optional["ListType"]: + return self.elem.is_list_like() + + +# A type representing a PyTorch custom class +@dataclass(frozen=True) +class CustomClassType(Type): + class_name: str + + def __str__(self) -> str: + """ + Return the class name will prefix __torch__.torch.classes + """ + return f"__torch__.torch.classes.{self.class_name}" + + def is_base_ty_like(self, base_ty: BaseTy) -> bool: + return False + + def is_symint_like(self) -> bool: + return False + + def is_nullable(self) -> bool: + """ + Assume a custom class is not nullable. + """ + return False + + def is_list_like(self) -> Optional["ListType"]: + return None + + +# List types specify that we may have multiples of an element. We +# also support explicit sizes on list types, but these have +# some nontrivial semantics! (However, for C++ API purposes, explicit +# sizes are mostly erased from the type system.) +# +# DANGER WILL ROBINSON: C++ elaboration depends on elem type; e.g., +# int[] elaborates differently than bool[3]! +@dataclass(frozen=True) +class ListType(Type): + elem: Type + size: Optional[int] + + def __str__(self) -> str: + size = f"{self.size}" if self.size else "" + return f"{self.elem}[{size}]" + + def is_base_ty_like(self, base_ty: BaseTy) -> bool: + return self.elem.is_base_ty_like(base_ty) + + def is_symint_like(self) -> bool: + return self.elem.is_symint_like() + + def is_nullable(self) -> bool: + return self.elem.is_nullable() + + def is_list_like(self) -> Optional["ListType"]: + return self + + +@dataclass(frozen=True) +class Argument: + # NB: I didn't put kwarg_only as a boolean field here, unlike + # c10::Argument, so that printing works correctly + + name: str + type: Type + default: Optional[str] + + # The semantics of the annotation field are a little strange. + # + # Alias annotations parametrize Tensors (since Tensors are the only things + # that can alias.) This motivates why I write Tensor(a!)? (and not, for + # example, Tensor?(a!)), because the (a!) describes aliasing on the tensor, + # which may be optional (i.e., the alias annotation should bind first to + # Tensor, before the optional postfix annotation). + # + # However, despite being a property of Tensor, we (and c10::Argument) + # store the annotation at the top level of the Argument, rather than + # inside the embedded Tensor type. In the C++ version of this + # class, we then go through great lengths to mimic the type + # structure in the annotation structure so we can correlate + # annotations with types. + # + # Now, it turns out, in all applications in code generation, the + # structure of annotated types is very simple. So we just hard + # code it here. But if we ever do get anything more complex, this + # model will have to change! + annotation: Optional[Annotation] + + @staticmethod + def parse(arg: str) -> "Argument": + name: str + default: Optional[str] + type_and_annot, name_and_default = arg.rsplit(" ", 1) + if "=" in name_and_default: + name, default = name_and_default.split("=") + else: + name = name_and_default + default = None + # TODO: deduplicate annotation matching with Return + match = re.match(r"Tensor\((.+)\)(.*)", type_and_annot) + annotation: Optional[Annotation] + if match: + # If you update this, make sure the __str__ still works too + assert match.group(2) in [ + "", + "?", + "[]", + ], "unrecognized alias analysis form with Tensor" + type_s = "Tensor" + match.group(2) + annotation = Annotation.parse(match.group(1)) + else: + type_s = type_and_annot + annotation = None + type = Type.parse(type_s) + r = Argument( + name=name, + type=type, + default=default, + annotation=annotation, + ) + assert str(r) == arg, f"{str(r)} != {arg}" + return r + + @property + def is_write(self) -> bool: + return self.annotation is not None and self.annotation.is_write + + def __str__(self) -> str: + type = f"{self.type}" + if self.annotation: + assert type in ["Tensor", "Tensor?", "Tensor[]"] + type = type.replace("Tensor", f"Tensor({self.annotation})") + if self.name is None: + return type + else: + mb_default = "" + if self.default: + mb_default = f"={self.default}" + return f"{type} {self.name}{mb_default}" + + +@dataclass(frozen=True) +class Return: + name: Optional[str] + type: Type + annotation: Optional[Annotation] + + @staticmethod + def parse(arg: str) -> "Return": + name: Optional[str] + if " " in arg: + type_and_annot, name = arg.rsplit(" ", 1) + else: + type_and_annot = arg + name = None + match = re.match(r"Tensor\((.+)\)(.*)", type_and_annot) + annotation: Optional[Annotation] + if match: + # If you update this, make sure the __str__ still works too + assert match.group(2) in [ + "", + "?", + "[]", + ], "unrecognized alias analysis form with Tensor" + type_s = "Tensor" + match.group(2) + annotation = Annotation.parse(match.group(1)) + else: + type_s = type_and_annot + annotation = None + type = Type.parse(type_s) + r = Return( + name=name, + type=type, + annotation=annotation, + ) + assert str(r) == arg, f"{str(r)} != {arg}" + return r + + @property + def is_write(self) -> bool: + return self.annotation is not None and self.annotation.is_write + + def __str__(self) -> str: + type = f"{self.type}" + if self.annotation: + assert type in ["Tensor", "Tensor?", "Tensor[]"] + type = type.replace("Tensor", f"Tensor({self.annotation})") + if self.name is None: + return type + else: + return f"{type} {self.name}" + + +# Represents the self argument for functions that may be methods +@dataclass(frozen=True) +class SelfArgument: + argument: Argument + + +# Bundle of arguments that represent a TensorOptions. This is mostly +# relevant for the public C++ API but we bake it into the core data +# model because other APIs often have to interact with it +@dataclass(frozen=True) +class TensorOptionsArguments: + dtype: Argument + layout: Argument + device: Argument + pin_memory: Argument + + def all(self) -> Sequence[Argument]: + return [self.dtype, self.layout, self.device, self.pin_memory] + + +@dataclass(frozen=True) +class Arguments: + # pre_self_positional is usually empty, but is notably non-empty + # for where.self, where the condition argument comes before the + # self argument + pre_self_positional: Tuple[Argument, ...] + self_arg: Optional[SelfArgument] + post_self_positional: Tuple[Argument, ...] + + pre_tensor_options_kwarg_only: Tuple[Argument, ...] + tensor_options: Optional[TensorOptionsArguments] + # post_tensor_options is typically memory format, which should be + # part of tensor options but isn't right now, and is usually + # placed after the tensor options arguments + post_tensor_options_kwarg_only: Tuple[Argument, ...] + + # Unlike in the previous codegen, we have factored out 'out' arguments + # in the canonical representation, removing them from kwarg + # arguments. This choice is justified by numerous downstream + # transformations which treat out arguments specially; additionally, + # you can see that canonicity is not violated! + out: Tuple[Argument, ...] # these are also kwarg-only + + @property + def flat_non_out(self) -> Sequence[Argument]: + ret: List[Argument] = [] + ret.extend(self.flat_positional) + ret.extend(self.flat_kwarg_only) + return ret + + @property + def flat_positional(self) -> Sequence[Argument]: + ret: List[Argument] = [] + ret.extend(self.pre_self_positional) + if self.self_arg is not None: + ret.append(self.self_arg.argument) + ret.extend(self.post_self_positional) + return ret + + @property + def post_self_positional_mutable(self) -> Sequence[Argument]: + return [a for a in self.post_self_positional if a.is_write] + + # NB: doesn't contain out arguments + @property + def flat_kwarg_only(self) -> Sequence[Argument]: + ret: List[Argument] = [] + ret.extend(self.pre_tensor_options_kwarg_only) + if self.tensor_options is not None: + ret.extend(self.tensor_options.all()) + ret.extend(self.post_tensor_options_kwarg_only) + return ret + + @property + def flat_all(self) -> Sequence[Argument]: + ret: List[Argument] = [] + ret.extend(self.flat_positional) + ret.extend(self.flat_kwarg_only) + ret.extend(self.out) + return ret + + @property + def non_out( + self, + ) -> Sequence[Union[Argument, SelfArgument, TensorOptionsArguments]]: + ret: List[Union[Argument, SelfArgument, TensorOptionsArguments]] = [] + ret.extend(self.positional) + ret.extend(self.kwarg_only) + return ret + + @property + def positional(self) -> Sequence[Union[Argument, SelfArgument]]: + ret: List[Union[Argument, SelfArgument]] = [] + ret.extend(self.pre_self_positional) + if self.self_arg is not None: + ret.append(self.self_arg) + ret.extend(self.post_self_positional) + return ret + + @property + def kwarg_only(self) -> Sequence[Union[Argument, TensorOptionsArguments]]: + ret: List[Union[Argument, TensorOptionsArguments]] = [] + ret.extend(self.pre_tensor_options_kwarg_only) + if self.tensor_options is not None: + ret.append(self.tensor_options) + ret.extend(self.post_tensor_options_kwarg_only) + return ret + + @property + def all(self) -> Sequence[Union[Argument, SelfArgument, TensorOptionsArguments]]: + ret: List[Union[Argument, SelfArgument, TensorOptionsArguments]] = [] + ret.extend(self.positional) + ret.extend(self.kwarg_only) + ret.extend(self.out) + return ret + + def mutable_arg_names(self) -> List[str]: + return [ + a.name + for a in self.flat_all + if a.annotation is not None and a.annotation.is_write + ] + + def has_tensor_arg(self) -> bool: + return any(a.type.is_tensor_like() for a in self.flat_non_out) + + def has_symint_arg(self) -> bool: + return any(a.type.is_symint_like() for a in self.flat_non_out) + + def has_generator_arg(self) -> bool: + return any(a.type.is_generator_like() for a in self.flat_non_out) + + def signature(self, *, strip_default: bool = False) -> "Arguments": + # dataclasses.replace could be used here, but it is less + # type safe so for now I've opted to type everything out + def strip_arg_annotation(a: Argument) -> Argument: + return Argument( + name=a.name, + type=a.type, + default=a.default if not strip_default else None, + annotation=None, + ) + + return Arguments( + pre_self_positional=tuple( + map(strip_arg_annotation, self.pre_self_positional) + ), + self_arg=SelfArgument(strip_arg_annotation(self.self_arg.argument)) + if self.self_arg is not None + else None, + post_self_positional=tuple( + map(strip_arg_annotation, self.post_self_positional) + ), + # Since TensorOptions are dropped, the post_tensor_options_kwargs are + # converted to pre_tensor_options_kwargs + pre_tensor_options_kwarg_only=tuple( + map(strip_arg_annotation, self.pre_tensor_options_kwarg_only) + ) + + tuple(map(strip_arg_annotation, self.post_tensor_options_kwarg_only)), + # TensorOptions are dropped in signature, + # so we can pair factory functions with their out= variants. + tensor_options=None, + post_tensor_options_kwarg_only=tuple(), + # out arguments are dropped in signature + out=(), + ) + + def remove_self_annotation(self) -> "Arguments": + assert self.self_arg is not None + return dataclasses.replace( + self, + self_arg=SelfArgument( + dataclasses.replace(self.self_arg.argument, annotation=None) + ), + ) + + def with_out_args(self, outs: List[Argument]) -> "Arguments": + assert len(self.out) == 0 + return dataclasses.replace( + self, + out=tuple(outs), + ) + + @staticmethod + def _preparse(args: str) -> Tuple[List[Argument], List[Argument], List[Argument]]: + positional: List[Argument] = [] + kwarg_only: List[Argument] = [] + out: List[Argument] = [] + arguments_acc = positional + + # TODO: Use a real parser here; this will get bamboozled + # by signatures that contain things like std::array (note the space) + for arg in args.split(", "): + if not arg: + continue + if arg == "*": + assert ( + arguments_acc is positional + ), "invalid syntax: kwarg-only specifier * can only occur once" + arguments_acc = kwarg_only + continue + parg = Argument.parse(arg) + # Currently, we rely directly on the invariant that there are NO + # kwarg-only mutating arguments. If you want to relax this, + # we will need a more semantic way of matching that takes + # into account return arguments. In that case, you will have + # to manage out computation a level up, in FunctionSchema. See Note + # [is_out_fn] + if parg.annotation is not None and parg.annotation.is_write: + if arguments_acc is positional: + pass # do nothing + elif arguments_acc is kwarg_only: + arguments_acc = out + else: + assert arguments_acc is not out + arguments_acc.append(parg) + + return positional, kwarg_only, out + + @staticmethod + def parse(args: str) -> "Arguments": + """ + Input: 'int x, int y, int z' + """ + + # We do this in two phases. First we parse into three + # main categories: positional, kwarg_only, out. + # Then, we reparse positional and kwarg_only to separate + # out the self argument and tensor options arguments. + + positional, kwarg_only, out = Arguments._preparse(args) + + # Split self argument + self_ix = None + for i, a in enumerate(positional): + if a.name == "self": + self_ix = i + break + pre_self_positional: List[Argument] + self_arg: Optional[SelfArgument] + post_self_positional: List[Argument] + if self_ix is not None: + pre_self_positional = positional[:self_ix] + self_arg = SelfArgument(positional[self_ix]) + post_self_positional = positional[self_ix + 1 :] + else: + pre_self_positional = [] + self_arg = None + post_self_positional = positional + + # Group tensor options arguments + pre_tensor_options_kwarg_only: List[Argument] = [] + tensor_options: Optional[TensorOptionsArguments] = None + post_tensor_options_kwarg_only: List[Argument] = [] + kwarg_only_acc = pre_tensor_options_kwarg_only + + def pred(name: str, ty: Type) -> Callable[[Argument], bool]: + return lambda a: a.name == name and a.type in [ty, OptionalType(ty)] + + predicates = [ # order matters + pred("dtype", Type.parse("ScalarType")), + pred("layout", Type.parse("Layout")), + pred("device", Type.parse("Device")), + pred("pin_memory", Type.parse("bool")), + ] + + i = 0 + while i < len(kwarg_only): + # If there is enough space... + if i <= len(kwarg_only) - len(predicates): + # And the next len(predicates) arguments look like TensorOptions arguments + if all( + p(a) + for p, a in zip(predicates, kwarg_only[i : i + len(predicates)]) + ): + assert kwarg_only_acc is pre_tensor_options_kwarg_only + # Group them together as one argument + tensor_options = TensorOptionsArguments( + dtype=kwarg_only[i], + layout=kwarg_only[i + 1], + device=kwarg_only[i + 2], + pin_memory=kwarg_only[i + 3], + ) + i += len(predicates) + kwarg_only_acc = post_tensor_options_kwarg_only + continue + kwarg_only_acc.append(kwarg_only[i]) + i += 1 + + return Arguments( + pre_self_positional=tuple(pre_self_positional), + self_arg=self_arg, + post_self_positional=tuple(post_self_positional), + pre_tensor_options_kwarg_only=tuple(pre_tensor_options_kwarg_only), + tensor_options=tensor_options, + post_tensor_options_kwarg_only=tuple(post_tensor_options_kwarg_only), + out=tuple(out), + ) + + def __str__(self) -> str: + all_arguments: List[str] = [] + all_arguments.extend(map(str, self.flat_positional)) + if self.flat_kwarg_only or self.out: + all_arguments.append("*") + all_arguments.extend(map(str, self.flat_kwarg_only)) + all_arguments.extend(map(str, self.out)) + return ", ".join(all_arguments) + + def __post_init__(self) -> None: + # TODO: These invariants are weirdly asymmetric? + # TODO: Fancier types? + if self.self_arg is None: + assert not self.pre_self_positional + if self.tensor_options is None: + assert not self.post_tensor_options_kwarg_only + + # We don't allow any of the following to have argument annotations, + # to keep things simple. + mutable_pre_self_positionals = [ + a + for a in self.pre_self_positional + if a.annotation is not None and a.annotation.is_write + ] + assert ( + len(mutable_pre_self_positionals) == 0 + ), "mutable pre_self_positional arguments are not currently supported in the schema" + + +# Names that validly are __iXXX__ indicating inplace operations. +# Taken from https://www.python.org/dev/peps/pep-0203/#new-methods +# NB: PyTorch hasn't actually implemented all of these +AUGMENTED_ASSIGNMENT_NAMES = [ + "add", + "sub", + "mul", + "div", + "mod", + "pow", + "lshift", + "rshift", + "and", + "xor", + "or", +] + + +# A BaseOperatorName is what we think of the operator name, without +# the overload name. Unusually, we don't represent this as just a +# string; instead, we directly represent a few important semantic +# bits of information we derive from the string: namely whether +# or not it's inplace (add_) and whether or not it's a double-underscore +# method (__add__) +@dataclass(frozen=True) +class BaseOperatorName: + base: str + inplace: bool + dunder_method: bool + # Note [Overload Ambiguity With Functional Variants] + # A handful of operators have both a "mutable" and a "functional" variant. + # (native_batch_norm is a good example, although this isn't the case today). + # For those operators, the mutable and functional variant take in the same set of + # arguments, but have different alias annotations. + # this makes it ambiguous when you try to resolve an OverloadPacket into an overload, + # given a set of input arguments. + # + # So instead of making the "functional" variant in this case a real overload, e.g: + # native_batch_norm (mutable variant) + # native_batch_norm.functional (functional variant) + # we make it a new base operator, + # native_batch_norm_functional (functional variant) + # + # In an ideal world, we would probably invert this so the operators were: + # native_batch_norm.mutable (mutable variant) + # native_batch_norm (functional variant) + # + # Doing that is BC-breaking though, so we're stuck with the above modeling. + functional_overload: bool = False + + @staticmethod + def parse(op: str) -> "BaseOperatorName": + assert op != "" + assert not op.endswith("_out"), ( + "_out suffix is reserved and not permitted for operator names; " + "did you mean to specify an out overload name instead?" + ) + m = re.match(r"^__([^_]+)__$", op) + if m is not None: + dunder_method = True + base = m.group(1) + if any(base == f"i{n}" for n in AUGMENTED_ASSIGNMENT_NAMES): + inplace = True + base = base[1:] + else: + inplace = False + # temporary, this is not intrinsically true but + # has been historically true for dunder methods + # we support (but, if we ever got, say, __int__, this would + # be wrong!) + assert base[0] != "i" + else: + dunder_method = False + base = op + if base[-1] == "_": + inplace = True + base = base[:-1] + else: + inplace = False + + # See Note [Overload Ambiguity With Functional Variants] + functional_suffix = "_functional" + if base.endswith(functional_suffix): + functional_overload = True + base = base[: -len(functional_suffix)] + # This seems complicated and unnecessary, so banning dunder methods + # for now on ops that have a functional + mutable variant (like native_batch_norm). + assert not dunder_method and not inplace + else: + functional_overload = False + + r = BaseOperatorName( + base=base, + inplace=inplace, + dunder_method=dunder_method, + functional_overload=functional_overload, + ) + assert str(r) == op, f"{str(r)} != {op}" + return r + + def __str__(self) -> str: + if self.dunder_method: + i = "i" if self.inplace else "" + return f"__{i}{self.base}__" + else: + i = ( + "_" + if self.inplace + else "_functional" + if self.functional_overload + else "" + ) + return f"{self.base}{i}" + + +# Operator name is the base operator name along with the (typically not +# user visible) overload string. +@dataclass(frozen=True) +class OperatorName: + name: BaseOperatorName + overload_name: str + + @staticmethod + def parse(op_name: str) -> "OperatorName": + if "." in op_name: + name, overload_name = op_name.split(".", 1) + else: + name = op_name + overload_name = "" + r = OperatorName(name=BaseOperatorName.parse(name), overload_name=overload_name) + assert str(r) == op_name, f"{str(r)} != {op_name}" + return r + + def __str__(self) -> str: + if self.overload_name: + return f"{self.name}.{self.overload_name}" + else: + return f"{self.name}" + + # NB: This must be synchronized with the naming scheme in + # aten/src/ATen/templates/Operators.h + # Given a function schema "aten::op.overload(...)", + # If there is no overload name, this returns f"{op}" + # If there is an overload name, this returns f"{op}_{overload}" + def unambiguous_name(self) -> str: + if self.overload_name: + return f"{self.name}_{self.overload_name}" + else: + return f"{self.name}" + + def remove_inplace(self) -> "OperatorName": + return OperatorName( + name=BaseOperatorName( + base=self.name.base, + inplace=False, + dunder_method=self.name.dunder_method, + ), + overload_name=self.overload_name, + ) + + def with_overload(self, overload: str) -> "OperatorName": + return OperatorName( + name=BaseOperatorName( + base=self.name.base, + inplace=False, + dunder_method=self.name.dunder_method, + ), + overload_name=overload, + ) + + +def gets_generated_out_inplace_wrapper( + f: NativeFunction, g: NativeFunctionsGroup, b: BackendIndex +) -> bool: + return ( + f.func.kind() is not SchemaKind.functional + and not b.has_kernel(f) + and b.has_kernel(g.functional) + ) + + +# NativeFunction objects that are views (f.is_view_op returns True) +# are added into a `NativeFunctionsViewGroup`, which we can use to +# easily access the generated (optional) view_copy NativeFunction. +# It's convenient to group them together, so we pair them up in NativeFunctionsViewGroup. +# See Note [Codegen'd {view}_copy Operators] +# +# One property of this representation is that in order for a view-like op to be part of +# a NativeFunctionsViewGroup, the "aliasing" version of that view op must exist. +# There's one case where that doesn't happen: we have a non-aliasing `narrow_copy.out` op, +# but don't have corresponding aliasing `narrow.out` op. +# This means that `narrow_copy.out` won't appear as a NativeFunctionsViewGroup. +@dataclass(frozen=True) +class NativeFunctionsViewGroup: + view: NativeFunction + # Note: the {view}_copy operator is optional because we currently don't generate copy variants + # for all view ops. Notably, we don't generate them for CompositeImplicitAutograd views + # (we already get them "for free" through decomposition) + view_copy: Optional[NativeFunction] + # view_inplace ops are also optional, but every view_inplace op should have out-of-place variant. + view_inplace: Optional[NativeFunction] + + def __post_init__(self) -> None: + assert self.view.is_view_op + if self.view_copy is None: + assert not gets_generated_view_copy(self.view), ( + f"{str(self.view.func.name)} appears to be a new operator that aliases its inputs." + " The codegen expects you to add a corresponding operator to native_functions.yaml:" + f" {get_view_copy_name(self.view)!s}." + " See Note [view_copy NativeFunctions] for details." + ) + else: + assert self.view_copy.func.name.name.base.endswith(("_copy", "_scatter")) + assert self.view.func.signature() == self.view_copy.func.signature( + strip_view_copy_name=True, + ) + assert "view_copy" in self.view_copy.tags, ( + f"{str(self.view_copy.func.name), str(self.view.tags)} appears to be a view_copy operator. The codegen expects" + " view_copy operators to be annotated with the 'view_copy' tag in native_functions.yaml." + " See Note [view_copy NativeFunction] for details." + ) + if self.view_inplace is not None: + assert self.view.func.signature() == self.view_inplace.func.signature() + + if self.view.has_composite_implicit_autograd_kernel: + if self.view_inplace is not None: + assert self.view_inplace.has_composite_implicit_autograd_kernel, ( + f"{str(self.view.func.name)} and {str(self.view_inplace.func.name)} must either" + " both have CompositeImplicitAutograd kernels, or both not have composite kernels." + ) + if self.view.has_composite_implicit_autograd_nested_tensor_kernel: + if self.view_inplace is not None: + assert ( + self.view_inplace.has_composite_implicit_autograd_nested_tensor_kernel + ), ( + f"{str(self.view.func.name)} and {str(self.view_inplace.func.name)} must either" + " both have CompositeImplicitAutogradNestedTensor kernels, or both not have composite kernels." + ) + + def functions(self, *, include_copy: bool = True) -> Iterator[NativeFunction]: + yield self.view + if self.view_inplace is not None: + yield self.view_inplace + if self.view_copy is not None and include_copy: + yield self.view_copy + + @property + def root_name(self) -> str: + return self.view.root_name + + @property + def composite(self) -> bool: + # We currently assert that the "group" is consistent. + # If the view op is composite, then its view_inplace op is too. + return self.view.has_composite_implicit_autograd_kernel + + +def gets_generated_view_copy(f: NativeFunction) -> bool: + # Only aliasing (view) operators get a copy variant. + if not f.is_view_op: + return False + # We don't need to bother generating copy variants for CompositeImplicitAutograd ops, + # because we can let them decompose into base view ops. + if f.has_composite_implicit_autograd_kernel: + return False + # We also don't need to generate copy variants for inplace views. + if "inplace_view" in f.tags: + return False + # Assume ops ending in _inverse have manually-defined copy variants + # (e.g. slice_inverse() has the copy variant slice_scatter()). + # We -could- probably generate these as well, but the codegen will be + # slightly different, and hand-writing these few kernels keeps codegen + # complexity lower. + if f.func.name.name.base.endswith("_inverse"): + return False + return True + + +# Given a NativeFunction that corresponds to a view op, +# returns the OperatorName of the corresponding "copy" variant of the op. +def get_view_copy_name(f: NativeFunction) -> "OperatorName": + # Right now, when asking for a view op's corresponding "view_copy" name + # we assert for sanity that the op is allowed to have a generated view_copy variant. + # (We can do this because "gets_generated_view_copy()" tell us which ops get a generated view_copy op). + # However, narrow_copy() already exists as an op directly in native_functions.yaml. + # I'm hardcoding narrow_copy here for now to maintain the assert, + # But we could also just get rid of the assert. + list_of_ops_with_explicit_view_copy_operators = ["narrow"] + if str(f.func.name) not in list_of_ops_with_explicit_view_copy_operators: + assert gets_generated_view_copy(f) + + base_name = f"{f.func.name.name.base}_copy" + view_copy_name = OperatorName( + name=BaseOperatorName( + base=base_name, inplace=False, dunder_method=f.func.name.name.dunder_method + ), + overload_name=f.func.name.overload_name, + ) + return view_copy_name + + +# Helper functions for parsing argument lists (both inputs and returns) + + +def parse_returns(return_decl: str) -> Tuple[Return, ...]: + """ + Input: '()' + Output: [] + """ + if return_decl == "()": + return () + if return_decl[0] == "(" and return_decl[-1] == ")": + return_decl = return_decl[1:-1] + return tuple(Return.parse(arg) for arg in return_decl.split(", ")) + + +# A Precompute instance consists of a map from kernel argument name +# to the list of Argument instances that should replace that +# kernel argument in the impl function. +@dataclass(frozen=True) +class Precompute: + # A map from kernel argument name -> a list of precomputed + # elements that replaces/supersedes it. + replace: Dict[str, List[Argument]] + # List of precomputed args added without replacement + add: List[Argument] + + @staticmethod + def parse(src: object) -> "Precompute": + assert isinstance(src, list) + + # src is a list of strings of the format: + # {kernel param name} -> {replacement decl}[, {replacement decl}, ...] + # [{add decl}[, {add decl}, ...]] + # The last line is optional and contains the precomputed parameters that are + # added without replacement. + # The other lines are parsed to get the names of which precomputed elements + # should replace which kernel arguments. + add_args = [] + if " -> " not in src[-1]: + add_list = src[-1].split(",") + add_args = [Argument.parse(name.strip()) for name in add_list] + src = src[:-1] + + replace = {} + for raw_replace_item in src: + assert isinstance(raw_replace_item, str) + assert " -> " in raw_replace_item, ( + "precomputed parameters without replacement" + " are allowed only in the last line" + ) + + arg, with_list_raw = raw_replace_item.split(" -> ") + with_list = with_list_raw.split(",") + with_list_args = [Argument.parse(name.strip()) for name in with_list] + replace[arg] = with_list_args + + r = Precompute(replace=replace, add=add_args) + assert r.to_list() == src, "r.to_list() != src" + return r + + def __post_init__(self) -> None: + # the template parameters are upper so if these are the + # same then it is ambiguous + for a in self.add: + assert a.name.upper() != a.name + for args in self.replace.values(): + for a in args: + assert a.name.upper() != a.name + + def to_list(self) -> List[str]: + replace_list = [] + for kernel_param, replacement_params in self.replace.items(): + replacements = ", ".join(str(param) for param in replacement_params) + replace_list.append(f"{kernel_param} -> {replacements}") + + return replace_list