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| # Copyright (c) Meta Platforms, Inc. and affiliates. | |
| # | |
| # This source code is licensed under the Apache License, Version 2.0 | |
| # found in the LICENSE file in the root directory of this source tree. | |
| import logging | |
| import os | |
| import random | |
| import subprocess | |
| from urllib.parse import urlparse | |
| import numpy as np | |
| import torch | |
| from torch import nn | |
| logger = logging.getLogger("dinov2") | |
| def load_pretrained_weights(model, pretrained_weights, checkpoint_key): | |
| if urlparse(pretrained_weights).scheme: # If it looks like an URL | |
| state_dict = torch.hub.load_state_dict_from_url(pretrained_weights, map_location="cpu") | |
| else: | |
| state_dict = torch.load(pretrained_weights, map_location="cpu") | |
| if checkpoint_key is not None and checkpoint_key in state_dict: | |
| logger.info(f"Take key {checkpoint_key} in provided checkpoint dict") | |
| state_dict = state_dict[checkpoint_key] | |
| # remove `module.` prefix | |
| state_dict = {k.replace("module.", ""): v for k, v in state_dict.items()} | |
| # remove `backbone.` prefix induced by multicrop wrapper | |
| state_dict = {k.replace("backbone.", ""): v for k, v in state_dict.items()} | |
| msg = model.load_state_dict(state_dict, strict=False) | |
| logger.info("Pretrained weights found at {} and loaded with msg: {}".format(pretrained_weights, msg)) | |
| def fix_random_seeds(seed=31): | |
| """ | |
| Fix random seeds. | |
| """ | |
| torch.manual_seed(seed) | |
| torch.cuda.manual_seed_all(seed) | |
| np.random.seed(seed) | |
| random.seed(seed) | |
| def get_sha(): | |
| cwd = os.path.dirname(os.path.abspath(__file__)) | |
| def _run(command): | |
| return subprocess.check_output(command, cwd=cwd).decode("ascii").strip() | |
| sha = "N/A" | |
| diff = "clean" | |
| branch = "N/A" | |
| try: | |
| sha = _run(["git", "rev-parse", "HEAD"]) | |
| subprocess.check_output(["git", "diff"], cwd=cwd) | |
| diff = _run(["git", "diff-index", "HEAD"]) | |
| diff = "has uncommitted changes" if diff else "clean" | |
| branch = _run(["git", "rev-parse", "--abbrev-ref", "HEAD"]) | |
| except Exception: | |
| pass | |
| message = f"sha: {sha}, status: {diff}, branch: {branch}" | |
| return message | |
| class CosineScheduler(object): | |
| def __init__(self, base_value, final_value, total_iters, warmup_iters=0, start_warmup_value=0, freeze_iters=0): | |
| super().__init__() | |
| self.final_value = final_value | |
| self.total_iters = total_iters | |
| freeze_schedule = np.zeros((freeze_iters)) | |
| warmup_schedule = np.linspace(start_warmup_value, base_value, warmup_iters) | |
| iters = np.arange(total_iters - warmup_iters - freeze_iters) | |
| schedule = final_value + 0.5 * (base_value - final_value) * (1 + np.cos(np.pi * iters / len(iters))) | |
| self.schedule = np.concatenate((freeze_schedule, warmup_schedule, schedule)) | |
| assert len(self.schedule) == self.total_iters | |
| def __getitem__(self, it): | |
| if it >= self.total_iters: | |
| return self.final_value | |
| else: | |
| return self.schedule[it] | |
| def has_batchnorms(model): | |
| bn_types = (nn.BatchNorm1d, nn.BatchNorm2d, nn.BatchNorm3d, nn.SyncBatchNorm) | |
| for name, module in model.named_modules(): | |
| if isinstance(module, bn_types): | |
| return True | |
| return False | |