[Typing][A-88] Add type annotations for python/paddle/vision/datasets/folder.py

[enkilee]

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• [Type Hints] 为公开 API 标注类型提示信息 #65008
  A-88

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[megemini]

示例中有两个地方可能要 ignore 一下：

            >>> data_folder_2 = DatasetFolder(
            ...     fake_data_dir,
            ...     loader=lambda x: cv2.imread(x),  # load image with OpenCV
            ...     extensions=(".jpg",),  # type: ignore # only load *.jpg files 
            ...     transform=transform,  # apply transform to every image
            ... )

            >>> print([img_path for img_path, label in data_folder_2.samples])
            >>> # doctest: +SKIP(it's different with windows)
            ['./temp_dir/class_0/abc.jpg', './temp_dir/class_1/mno/stu.jpg']
            >>> # doctest: -SKIP
            >>> print(len(data_folder_2))
            2

            >>> for img, label in iter(data_folder_2):
            ...     # do something with img and label
            ...     print(type(img), img.shape, label) # type: ignore
            ...     # <class 'paddle.Tensor'> [3, 64, 64] 0

[megemini]

ImageFolder 的示例也要改一下滴 ～～～

[megemini]

@enkilee

... print(type(img), img.size) # type: ignore

这里是不需要 ignore 的，而

... print(type(img), img.shape)

这里需要 ～

主要是因为 Tensor, PILImage, ndarray 都有 size 属性，但是 PILImage 没有 shape ，所以 mypy 检查的时候取类型中属性集合的交集就报错了～

mypy 会检查无用的 ignore，所以报错了 <string>:42: error: Unused "type: ignore" comment [unused-ignore] ～

[enkilee]

收到，谢谢解惑。

[SigureMo]

CI 报错得看看

[SigureMo]

LGTMeow