109 lines
3.5 KiB
Python
109 lines
3.5 KiB
Python
# Copyright (c) 2018-2019, NVIDIA CORPORATION
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# Copyright (c) 2017- Facebook, Inc
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# * Neither the name of the copyright holder nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import os
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import numpy as np
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import torch
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import shutil
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import torch.distributed as dist
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def should_backup_checkpoint(args):
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def _sbc(epoch):
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return args.gather_checkpoints and (epoch < 10 or epoch % 10 == 0)
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return _sbc
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def save_checkpoint(
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state,
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is_best,
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filename="checkpoint.pth.tar",
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checkpoint_dir="./",
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backup_filename=None,
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):
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if (not torch.distributed.is_initialized()) or torch.distributed.get_rank() == 0:
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filename = os.path.join(checkpoint_dir, filename)
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print("SAVING {}".format(filename))
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torch.save(state, filename)
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if is_best:
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shutil.copyfile(
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filename, os.path.join(checkpoint_dir, "model_best.pth.tar")
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)
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if backup_filename is not None:
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shutil.copyfile(filename, os.path.join(checkpoint_dir, backup_filename))
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def timed_generator(gen):
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start = time.time()
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for g in gen:
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end = time.time()
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t = end - start
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yield g, t
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start = time.time()
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def timed_function(f):
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def _timed_function(*args, **kwargs):
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start = time.time()
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ret = f(*args, **kwargs)
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return ret, time.time() - start
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return _timed_function
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def accuracy(output, target, topk=(1,)):
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"""Computes the precision@k for the specified values of k"""
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maxk = max(topk)
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batch_size = target.size(0)
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_, pred = output.topk(maxk, 1, True, True)
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pred = pred.t()
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correct = pred.eq(target.view(1, -1).expand_as(pred))
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res = []
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for k in topk:
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correct_k = correct[:k].view(-1).float().sum(0, keepdim=True)
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res.append(correct_k.mul_(100.0 / batch_size))
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return res
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def reduce_tensor(tensor):
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rt = tensor.clone()
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dist.all_reduce(rt, op=dist.ReduceOp.SUM)
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rt /= (
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torch.distributed.get_world_size() if torch.distributed.is_initialized() else 1
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)
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return rt
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def first_n(n, generator):
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for i, d in zip(range(n), generator):
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yield d
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