[xdoctest][task 293-296] reformat example code with google style in vision
#56458
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| # <class 'paddle.Tensor'> [3, 281, 500] | ||
| print(type(label), label.shape) | ||
| # <class 'numpy.ndarray'> (281, 500) | ||
| >>> import itertools |
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这个应该是下载数据集超时了，@megemini 是否有方法通过 directive 来修改超时时间呢，比如 # doctest: +TIMEOUT(15)
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好问题！简单的说，不行 ～ xdoctest 不支持自定义 directive ～
不过，之前也有想过，目前这个 timeout 不太灵活，如果能指定时间就好了 ～
#56400 这个 PR 里面看看能不能一起搞定吧！
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是要添加# doctest: +TIMEOUT()吗
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暂时还不可以加，等 #56400 合入后 merge 一下才可以，这个 PR 应该近期就可以 merge
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#56400 已 merge，麻烦 merge 下最新的 develop 尝试加上 TIMEOUT directive
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我添加了# doctest: +TIMEOUT(15)，是15太短了吗，还是我命令写的有问题，现在失败了，pr-ci-static-check直接暂停了
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2023-08-23 13:57:24 ----------------End of the Check--------------------
2023-08-23 13:57:24 7 sample codes ran success
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.datasets.DatasetFolder:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.datasets.FashionMNIST:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.datasets.ImageFolder:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.datasets.MNIST:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.get_image_backend:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.image_load:1:0 ln 1)>
2023-08-23 13:57:24 <DocTest(<modname?> paddle.vision.set_image_backend:1:0 ln 1)>
2023-08-23 13:57:24 1 sample codes ran timeout
2023-08-23 13:57:24 paddle.vision.datasets.VOC2012:1 - more than 15.0s
2023-08-23 13:57:24 Sample code check is successful!15秒太短，看日志里面下载没跑完～～～
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示例中有大量的
>>> for i in range(len(data_folder_1)):
... img, label = data_folder_1[i]
... # do something with img and label
... print(type(img), img.size, label)
... # <class 'PIL.Image.Image'> (32, 32) 0类似的输出 ～ 我觉得不用改，这样就挺好，不然输出有可能受文件顺序的影响，而且也太繁琐。
@SigureMo 看看怎么搞？
for 循环的我觉得确实可以不用展开，目的不是对比输出，主要是展示输出是什么（如果没记错当初这些示例代码还是我统一的写法） |
…vision` (PaddlePaddle#56458) * [Doctest]fix No.293-296, test=docs_preview * empty commit * code style * empty commit * fix timeout * fix timeout
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Description
修改如下文件的示例代码，使其通过
xdoctest检查：python/paddle/vision/datasets/folder.pypython/paddle/vision/datasets/mnist.pypython/paddle/vision/datasets/voc2012.pypython/paddle/vision/image.py预览：
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@sunzhongkai588 @SigureMo @megemini