注意

您正在阅读 MMSelfSup 0.x 版本的文档，而 MMSelfSup 0.x 版本将会在 2022 年末开始逐步停止维护。我们建议您及时升级到 MMSelfSup 1.0.0rc 版本，享受由 OpenMMLab 2.0 带来的更多新特性和更佳的性能表现。阅读 MMSelfSup 1.0.0rc 的发版日志, 代码和文档获取更多信息。

mmselfsup.datasets.dataset_wrappers 源代码

# Copyright (c) OpenMMLab. All rights reserved.
from torch.utils.data.dataset import ConcatDataset as _ConcatDataset

from .builder import DATASETS


[文档]@DATASETS.register_module()
class ConcatDataset(_ConcatDataset):
    """A wrapper of concatenated dataset.

    Same as :obj:`torch.utils.data.dataset.ConcatDataset`, but
    concat the group flag for image aspect ratio.

    Args:
        datasets (list[:obj:`Dataset`]): A list of datasets.
    """

    def __init__(self, datasets):
        super(ConcatDataset, self).__init__(datasets)
        self.CLASSES = datasets[0].CLASSES


[文档]@DATASETS.register_module()
class RepeatDataset(object):
    """A wrapper of repeated dataset.

    The length of repeated dataset will be `times` larger than the original
    dataset. This is useful when the data loading time is long but the dataset
    is small. Using RepeatDataset can reduce the data loading time between
    epochs.

    Args:
        dataset (:obj:`Dataset`): The dataset to be repeated.
        times (int): Repeat times.
    """

    def __init__(self, dataset, times):
        self.dataset = dataset
        self.times = times
        self.CLASSES = dataset.CLASSES

        self._ori_len = len(self.dataset)

    def __getitem__(self, idx):
        return self.dataset[idx % self._ori_len]

    def __len__(self):
        return self.times * self._ori_len