233 lines
8.0 KiB
Python
233 lines
8.0 KiB
Python
# Copyright (c) OpenMMLab. All rights reserved.
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from typing import Callable, Dict, List, Optional, Sequence, Tuple, Union
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import mmengine
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from mmengine import FileClient
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from mmengine.logging import MMLogger
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from mmcls.registry import DATASETS
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from .base_dataset import BaseDataset
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def find_folders(root: str,
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file_client: FileClient) -> Tuple[List[str], Dict[str, int]]:
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"""Find classes by folders under a root.
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Args:
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root (string): root directory of folders
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Returns:
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Tuple[List[str], Dict[str, int]]:
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- folders: The name of sub folders under the root.
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- folder_to_idx: The map from folder name to class idx.
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"""
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folders = list(
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file_client.list_dir_or_file(
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root,
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list_dir=True,
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list_file=False,
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recursive=False,
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))
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folders.sort()
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folder_to_idx = {folders[i]: i for i in range(len(folders))}
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return folders, folder_to_idx
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def get_samples(root: str, folder_to_idx: Dict[str, int],
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is_valid_file: Callable, file_client: FileClient):
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"""Make dataset by walking all images under a root.
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Args:
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root (string): root directory of folders
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folder_to_idx (dict): the map from class name to class idx
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is_valid_file (Callable): A function that takes path of a file
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and check if the file is a valid sample file.
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Returns:
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Tuple[list, set]:
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- samples: a list of tuple where each element is (image, class_idx)
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- empty_folders: The folders don't have any valid files.
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"""
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samples = []
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available_classes = set()
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for folder_name in sorted(list(folder_to_idx.keys())):
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_dir = file_client.join_path(root, folder_name)
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files = list(
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file_client.list_dir_or_file(
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_dir,
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list_dir=False,
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list_file=True,
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recursive=True,
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))
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for file in sorted(list(files)):
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if is_valid_file(file):
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path = file_client.join_path(folder_name, file)
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item = (path, folder_to_idx[folder_name])
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samples.append(item)
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available_classes.add(folder_name)
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empty_folders = set(folder_to_idx.keys()) - available_classes
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return samples, empty_folders
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@DATASETS.register_module()
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class CustomDataset(BaseDataset):
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"""Custom dataset for classification.
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The dataset supports two kinds of annotation format.
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1. An annotation file is provided, and each line indicates a sample:
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The sample files: ::
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data_prefix/
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├── folder_1
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│ ├── xxx.png
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│ ├── xxy.png
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│ └── ...
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└── folder_2
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├── 123.png
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├── nsdf3.png
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└── ...
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The annotation file (the first column is the image path and the second
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column is the index of category): ::
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folder_1/xxx.png 0
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folder_1/xxy.png 1
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folder_2/123.png 5
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folder_2/nsdf3.png 3
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...
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Please specify the name of categories by the argument ``classes``
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or ``metainfo``.
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2. The samples are arranged in the specific way: ::
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data_prefix/
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├── class_x
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│ ├── xxx.png
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│ ├── xxy.png
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│ └── ...
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│ └── xxz.png
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└── class_y
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├── 123.png
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├── nsdf3.png
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├── ...
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└── asd932_.png
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If the ``ann_file`` is specified, the dataset will be generated by the
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first way, otherwise, try the second way.
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Args:
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ann_file (str): Annotation file path. Defaults to ''.
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metainfo (dict, optional): Meta information for dataset, such as class
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information. Defaults to None.
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data_root (str): The root directory for ``data_prefix`` and
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``ann_file``. Defaults to ''.
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data_prefix (str | dict): Prefix for the data. Defaults to ''.
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extensions (Sequence[str]): A sequence of allowed extensions. Defaults
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to ('.jpg', '.jpeg', '.png', '.ppm', '.bmp', '.pgm', '.tif').
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lazy_init (bool): Whether to load annotation during instantiation.
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In some cases, such as visualization, only the meta information of
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the dataset is needed, which is not necessary to load annotation
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file. ``Basedataset`` can skip load annotations to save time by set
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``lazy_init=False``. Defaults to False.
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**kwargs: Other keyword arguments in :class:`BaseDataset`.
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"""
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def __init__(self,
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ann_file: str = '',
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metainfo: Optional[dict] = None,
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data_root: str = '',
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data_prefix: Union[str, dict] = '',
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extensions: Sequence[str] = ('.jpg', '.jpeg', '.png', '.ppm',
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'.bmp', '.pgm', '.tif'),
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lazy_init: bool = False,
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**kwargs):
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assert (ann_file or data_prefix or data_root), \
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'One of `ann_file`, `data_root` and `data_prefix` must '\
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'be specified.'
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self.extensions = tuple(set([i.lower() for i in extensions]))
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super().__init__(
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# The base class requires string ann_file but this class doesn't
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ann_file=ann_file,
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metainfo=metainfo,
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data_root=data_root,
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data_prefix=data_prefix,
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# Force to lazy_init for some modification before loading data.
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lazy_init=True,
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**kwargs)
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# Full initialize the dataset.
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if not lazy_init:
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self.full_init()
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def _find_samples(self, file_client):
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"""find samples from ``data_prefix``."""
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classes, folder_to_idx = find_folders(self.img_prefix, file_client)
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samples, empty_classes = get_samples(
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self.img_prefix,
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folder_to_idx,
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is_valid_file=self.is_valid_file,
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file_client=file_client,
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)
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if len(samples) == 0:
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raise RuntimeError(
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f'Found 0 files in subfolders of: {self.data_prefix}. '
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f'Supported extensions are: {",".join(self.extensions)}')
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if self.CLASSES is not None:
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assert len(self.CLASSES) == len(classes), \
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f"The number of subfolders ({len(classes)}) doesn't match " \
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f'the number of specified classes ({len(self.CLASSES)}). ' \
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'Please check the data folder.'
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else:
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self._metainfo['classes'] = tuple(classes)
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if empty_classes:
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logger = MMLogger.get_current_instance()
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logger.warning(
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'Found no valid file in the folder '
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f'{", ".join(empty_classes)}. '
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f"Supported extensions are: {', '.join(self.extensions)}")
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self.folder_to_idx = folder_to_idx
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return samples
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def load_data_list(self):
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"""Load image paths and gt_labels."""
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if self.img_prefix:
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file_client = FileClient.infer_client(uri=self.img_prefix)
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if not self.ann_file:
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samples = self._find_samples(file_client)
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else:
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lines = mmengine.list_from_file(self.ann_file)
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samples = [x.strip().rsplit(' ', 1) for x in lines]
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def add_prefix(filename, prefix=''):
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if not prefix:
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return filename
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else:
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return file_client.join_path(prefix, filename)
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data_list = []
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for filename, gt_label in samples:
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img_path = add_prefix(filename, self.img_prefix)
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info = {'img_path': img_path, 'gt_label': int(gt_label)}
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data_list.append(info)
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return data_list
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def is_valid_file(self, filename: str) -> bool:
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"""Check if a file is a valid sample."""
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return filename.lower().endswith(self.extensions)
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