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| # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | |
| import os | |
| import sys | |
| try: | |
| from torch.hub import _download_url_to_file | |
| from torch.hub import urlparse | |
| from torch.hub import HASH_REGEX | |
| except ImportError: | |
| from torch.utils.model_zoo import _download_url_to_file | |
| from torch.utils.model_zoo import urlparse | |
| from torch.utils.model_zoo import HASH_REGEX | |
| from maskrcnn_benchmark.utils.comm import is_main_process | |
| from maskrcnn_benchmark.utils.comm import synchronize | |
| # very similar to https://github.com/pytorch/pytorch/blob/master/torch/utils/model_zoo.py | |
| # but with a few improvements and modifications | |
| def cache_url(url, model_dir=None, progress=True): | |
| r"""Loads the Torch serialized object at the given URL. | |
| If the object is already present in `model_dir`, it's deserialized and | |
| returned. The filename part of the URL should follow the naming convention | |
| ``filename-<sha256>.ext`` where ``<sha256>`` is the first eight or more | |
| digits of the SHA256 hash of the contents of the file. The hash is used to | |
| ensure unique names and to verify the contents of the file. | |
| The default value of `model_dir` is ``$TORCH_HOME/models`` where | |
| ``$TORCH_HOME`` defaults to ``~/.torch``. The default directory can be | |
| overridden with the ``$TORCH_MODEL_ZOO`` environment variable. | |
| Args: | |
| url (string): URL of the object to download | |
| model_dir (string, optional): directory in which to save the object | |
| progress (bool, optional): whether or not to display a progress bar to stderr | |
| Example: | |
| >>> cached_file = maskrcnn_benchmark.utils.model_zoo.cache_url('https://s3.amazonaws.com/pytorch/models/resnet18-5c106cde.pth') | |
| """ | |
| if model_dir is None: | |
| torch_home = os.path.expanduser(os.getenv("TORCH_HOME", "~/.torch")) | |
| model_dir = os.getenv("TORCH_MODEL_ZOO", os.path.join(torch_home, "models")) | |
| if not os.path.exists(model_dir): | |
| os.makedirs(model_dir) | |
| parts = urlparse(url) | |
| filename = os.path.basename(parts.path) | |
| if filename == "model_final.pkl": | |
| # workaround as pre-trained Caffe2 models from Detectron have all the same filename | |
| # so make the full path the filename by replacing / with _ | |
| filename = parts.path.replace("/", "_") | |
| cached_file = os.path.join(model_dir, filename) | |
| if not os.path.exists(cached_file) and is_main_process(): | |
| sys.stderr.write('Downloading: "{}" to {}\n'.format(url, cached_file)) | |
| hash_prefix = HASH_REGEX.search(filename) | |
| if hash_prefix is not None: | |
| hash_prefix = hash_prefix.group(1) | |
| # workaround: Caffe2 models don't have a hash, but follow the R-50 convention, | |
| # which matches the hash PyTorch uses. So we skip the hash matching | |
| # if the hash_prefix is less than 6 characters | |
| if len(hash_prefix) < 6: | |
| hash_prefix = None | |
| _download_url_to_file(url, cached_file, hash_prefix, progress=progress) | |
| synchronize() | |
| return cached_file |