/
memory.py
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/
memory.py
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# Copyright 2022 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
A collection of utilities for ensuring that training can always occur. Heavily influenced by the
[toma](https://github.com/BlackHC/toma) library.
"""
import functools
import gc
import inspect
import torch
def should_reduce_batch_size(exception: Exception) -> bool:
"""
Checks if `exception` relates to CUDA out-of-memory, CUDNN not supported, or CPU out-of-memory
Args:
exception (`Exception`):
An exception
"""
_statements = [
"CUDA out of memory.", # CUDA OOM
"cuDNN error: CUDNN_STATUS_NOT_SUPPORTED.", # CUDNN SNAFU
"DefaultCPUAllocator: can't allocate memory", # CPU OOM
]
if isinstance(exception, RuntimeError) and len(exception.args) == 1:
return any(err in exception.args[0] for err in _statements)
return False
def find_executable_batch_size(function: callable = None, starting_batch_size: int = 128):
"""
A basic decorator that will try to execute `function`. If it fails from exceptions related to out-of-memory or
CUDNN, the batch size is cut in half and passed to `function`
`function` must take in a `batch_size` parameter as its first argument.
Args:
function (`callable`, *optional*):
A function to wrap
starting_batch_size (`int`, *optional*):
The batch size to try and fit into memory
"""
if function is None:
return functools.partial(find_executable_batch_size, starting_batch_size=starting_batch_size)
batch_size = starting_batch_size
def decorator(*args, **kwargs):
nonlocal batch_size
gc.collect()
torch.cuda.empty_cache()
params = list(inspect.signature(function).parameters.keys())
# Guard against user error
if len(params) < (len(args) + 1):
arg_str = ", ".join([f"{arg}={value}" for arg, value in zip(params[1:], args[1:])])
raise TypeError(
f"Batch size was passed into `{function.__name__}` as the first argument when called."
f"Remove this as the decorator already does so: `{function.__name__}({arg_str})`"
)
while True:
if batch_size == 0:
raise RuntimeError("No executable batch size found, reached zero.")
try:
return function(batch_size, *args, **kwargs)
except Exception as e:
if should_reduce_batch_size(e):
gc.collect()
torch.cuda.empty_cache()
batch_size //= 2
else:
raise
return decorator