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# Copyright 2021 AlQuraishi Laboratory
#
# 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.
import importlib
from typing import Any, Tuple, List, Callable, Optional
import torch
import torch.utils.checkpoint
BLOCK_ARG = Any
BLOCK_ARGS = List[BLOCK_ARG]
@torch.jit.ignore
def checkpoint_blocks(
blocks: List[Callable],
args: BLOCK_ARGS,
blocks_per_ckpt: Optional[int],
) -> BLOCK_ARGS:
"""
Chunk a list of blocks and run each chunk with activation
checkpointing. We define a "block" as a callable whose only inputs are
the outputs of the previous block.
Implements Subsection 1.11.8
Args:
blocks:
List of blocks
args:
Tuple of arguments for the first block.
blocks_per_ckpt:
Size of each chunk. A higher value corresponds to fewer
checkpoints, and trades memory for speed. If None, no checkpointing
is performed.
Returns:
The output of the final block
"""
def wrap(a):
return (a,) if type(a) is not tuple else a
def exec(b, a):
for block in b:
a = wrap(block(*a))
return a
def chunker(s, e):
def exec_sliced(*a):
return exec(blocks[s:e], a)
return exec_sliced
# Avoids mishaps when the blocks take just one argument
args = wrap(args)
if blocks_per_ckpt is None or not torch.is_grad_enabled():
return exec(blocks, args)
elif blocks_per_ckpt < 1 or blocks_per_ckpt > len(blocks):
raise ValueError("blocks_per_ckpt must be between 1 and len(blocks)")
for s in range(0, len(blocks), blocks_per_ckpt):
e = s + blocks_per_ckpt
args = torch.utils.checkpoint.checkpoint(chunker(s, e), *args, use_reentrant=True)
args = wrap(args)
return args
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