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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0
# DeepSpeed Team
import cupy
from torch.utils.dlpack import to_dlpack
from torch.utils.dlpack import from_dlpack
class CupyBackend(object):
def __init__(self):
pass
def torch2cupy(self, tensor):
return cupy.fromDlpack(to_dlpack(tensor))
def cupy2torch(self, cupy_tensor):
return from_dlpack(cupy_tensor.toDlpack())
def compress_by_chunk(self, cupy_bool_tensor, num_chunks):
packed_sign = cupy.packbits(cupy_bool_tensor)
sign_list_packed = cupy.split(packed_sign, num_chunks)
cupy.cuda.get_current_stream().synchronize()
return sign_list_packed
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