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from typing import Optional, Union
import torch
import lm_eval.models.utils
from lm_eval.api.registry import register_model
from lm_eval.models.huggingface import HFLM
@register_model("mamba_ssm")
class MambaLMWrapper(HFLM):
def __init__(
self,
pretrained="state-spaces/mamba-130m",
**kwargs,
) -> None:
"""
Mamba (via the `mamba_ssm` package) supports the following args:
```
d_model: int,
n_layer: int,
vocab_size: int,
initializer_cfg=None,
pad_vocab_size_multiple: int = 1,
ssm_cfg=None,
norm_epsilon: float = 1e-5,
rms_norm: bool = False,
initializer_cfg=None,
fused_add_norm=False,
residual_in_fp32=False,
```
See https://github.com/state-spaces/mamba/blob/main/mamba_ssm/models/mixer_seq_simple.py#L175 for more info.
The above can all be passed via `--model_args` or to this __init__() directly
but we recommend placing many of these within the config.json file uploaded alongside your
Mamba model to the HF Hub instead.
All other HuggingFace from_pretrained() kwargs
such as those related to
`parallelize=True`, PEFT, autoGPTQ,
or any sub-configurations of these advanced args,
are unsupported by the `mamba_ssm` package.
The HFLM arguments
`backend`, `tokenizer`, `truncation`, `max_length`,
`device`, `dtype`, `batch_size`, `max_batch_size`, `trust_remote_code`, `use_fast_tokenizer`
Are all supported by Mamba where they do not conflict
with Mamba-specific restrictions such as causal LMs only.
"""
if "backend" in kwargs:
# mamba currently only supports causal models
assert kwargs["backend"] == "causal"
super().__init__(
pretrained=pretrained,
# set appropriate defaults for tokenizer, max length, etc
backend=kwargs.pop("backend", "causal"),
tokenizer=kwargs.pop("tokenizer", "EleutherAI/gpt-neox-20b"),
max_length=kwargs.pop("max_length", 2048),
**kwargs,
)
def _get_config(
self,
pretrained: str,
**kwargs,
) -> None:
try:
from mamba_ssm.utils.hf import load_config_hf # noqa: F811
except ModuleNotFoundError:
raise Exception(
"attempted to use 'mamba_ssm' LM type, but package `mamba_ssm` is not installed. \
please install mamba via `pip install lm-eval[mamba]` or `pip install -e .[mamba]`",
)
self._config = load_config_hf(pretrained)
def _create_model(
self,
pretrained: str,
dtype: Optional[Union[str, torch.dtype]] = "float16",
# no `parallelize=True` options
# no PEFT and quantization options
# Mamba does not support arbitrary HF from_pretrained() args
**kwargs,
) -> None:
try:
from mamba_ssm.models.mixer_seq_simple import MambaLMHeadModel # noqa: F811
except ModuleNotFoundError:
raise Exception(
"attempted to use 'mamba_ssm' LM type, but package `mamba_ssm` is not installed. \
please install mamba via `pip install lm-eval[mamba]` or `pip install -e .[mamba]`",
)
self._model = MambaLMHeadModel.from_pretrained(
pretrained,
device=self._device,
dtype=torch.float16
if dtype == "auto"
else lm_eval.models.utils.get_dtype(dtype),
)
def _model_generate(self, context, max_length, stop, **generation_kwargs):
for key in ("do_sample", "attention_mask"):
if key in generation_kwargs:
generation_kwargs.pop(key)
# mamba's custom GenerationMixin currently does not support
# passing stopping criteria.
# for the time being, we simply generate to max length,
# then truncate (equivalent result)
# -- this should be revisited to speed up generation
# stopping_criteria = stop_sequences_criteria(
# self.tokenizer, stop, 1, context.shape[0]
# )
return self.model.generate(
input_ids=context,
max_length=max_length,
# stopping_criteria=stopping_criteria,
# pad_token_id=self.tokenizer.pad_token_id,
# use_cache=True,
**generation_kwargs,
)
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