add bytes and os.PathLike to ImageFolder type hint

[wztdream]

Hi all,
This is to add bytes and os.PathLike type to ImageFolder type hint to avoid type checking warning see issue

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[NicolasHug]

Thanks for the PR @wztdream !

I'm confused, are we really allowing bytes type? @pmeier ?

[pmeier]

As long as we only use it within os.path functions, it should be fine. Question is if we want to do that. I'm not sure if it is worth it.

[NicolasHug]

yeah, I feel like this isn't something we'd want to explicitly support.
Or at the very least, I'm worried that we'll have to update the type annotation every single time os.path decides to support yet another thing

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[pmeier]

@wztdream Thanks for the PR! Unfortunately, you would need to fix the annotation in more places, since DataFolder internally uses functions that currently are only annotated to take str's. You can run mypy to detect all these cases.

[vivekkumar7089]

@wztdream, If you are busy with some other works, then please let me know. I will be happy to make a PR for this issue :).

[wztdream]

@wztdream, If you are busy with some other works, then please let me know. I will be happy to make a PR for this issue :).

Sorry for the delay, I am busy these days, it is great you can help to fix this issue, go ahead and thank you for help :)

[wztdream]

@wztdream Thanks for the PR! Unfortunately, you would need to fix the annotation in more places, since DataFolder internally uses functions that currently are only annotated to take str's. You can run mypy to detect all these cases.

Sorry for delay, I just have some time to update this PR, but I found it seems modify the type hint not a good way to solve this issue, as vivekkumar7089 have mentioned, following is the errors after run mypy. The impact seems too large, I think we need better way to handle pathlike typehint.

torchvision/datasets/vision.py:73: error: On Python 3 '{}'.format(b'abc') produces "b'abc'", not 'abc'; use '{!r}'.format(b'abc') if this is desired behavior 
[str-bytes-safe]
                body.append("Root location: {}".format(self.root))
                            ^
torchvision/datasets/folder.py:44: error: On Python 3 '{}'.format(b'abc') produces "b'abc'", not 'abc'; use '{!r}'.format(b'abc') if this is desired behavior 
[str-bytes-safe]
            raise FileNotFoundError(f"Couldn't find any class folder in {directory}.")
                                    ^
torchvision/datasets/folder.py:47: error: Incompatible return value type (got "Tuple[List[Union[str, bytes]], Dict[Union[str, bytes], int]]", expected
"Tuple[List[str], Dict[str, int]]")  [return-value]
        return classes, class_to_idx
               ^
torchvision/datasets/folder.py:154: error: Argument 1 to "find_classes" of "DatasetFolder" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
            classes, class_to_idx = self.find_classes(self.root)
                                                      ^
torchvision/datasets/folder.py:155: error: Argument 1 to "make_dataset" of "DatasetFolder" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
            samples = self.make_dataset(self.root, class_to_idx, extensions, is_valid_file)
                                        ^
torchvision/datasets/flickr.py:78: error: Argument 1 to "Flickr8kParser" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            parser = Flickr8kParser(self.root)
                                    ^
torchvision/datasets/flickr.py:154: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            filename = os.path.join(self.root, img_id)
                                    ^
torchvision/datasets/widerface.py:109: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            filepath = os.path.join(self.root, "wider_face_split", filename)
                                    ^
torchvision/datasets/widerface.py:119: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                        img_path = os.path.join(self.root, "WIDER_" + self.split, "images", line)
                                                ^
torchvision/datasets/widerface.py:152: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            filepath = os.path.join(self.root, "wider_face_split", "wider_face_test_filelist.txt")
                                    ^
torchvision/datasets/widerface.py:158: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                    img_path = os.path.join(self.root, "WIDER_test", "images", line)
                                            ^
torchvision/datasets/widerface.py:168: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                extracted_dir = os.path.join(self.root, file)
                                             ^
torchvision/datasets/widerface.py:180: error: Argument 2 to "download_file_from_google_drive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
                download_file_from_google_drive(file_id, self.root, filename, md5)
                                                         ^
torchvision/datasets/widerface.py:181: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                filepath = os.path.join(self.root, filename)
                                        ^
torchvision/datasets/widerface.py:186: error: Argument "download_root" to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected
"str"  [arg-type]
                                         download_root=self.root,
                                                       ^
torchvision/datasets/voc.py:103: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            voc_root = os.path.join(self.root, base_dir)
                                    ^
torchvision/datasets/voc.py:106: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                download_and_extract_archive(self.url, self.root, filename=self.filename, md5=self.md5)
                                                       ^
torchvision/datasets/usps.py:52: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            full_path = os.path.join(self.root, filename)
                                     ^
torchvision/datasets/usps.py:55: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                download_url(url, self.root, filename, md5=checksum)
                                  ^
torchvision/datasets/svhn.py:70: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            loaded_mat = sio.loadmat(os.path.join(self.root, self.filename))
                                                  ^
torchvision/datasets/svhn.py:113: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            fpath = os.path.join(root, self.filename)
                                 ^
torchvision/datasets/svhn.py:118: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            download_url(self.url, self.root, self.filename, md5)
                                   ^
torchvision/datasets/stl10.py:93: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                self.root, self.base_folder, self.class_names_file)
                ^
torchvision/datasets/stl10.py:144: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                    self.root, self.base_folder, labels_file)
                    ^
torchvision/datasets/stl10.py:148: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            path_to_data = os.path.join(self.root, self.base_folder, data_file)
                                        ^
torchvision/datasets/stl10.py:161: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                fpath = os.path.join(root, self.base_folder, filename)
                                     ^
torchvision/datasets/stl10.py:170: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            download_and_extract_archive(self.url, self.root, filename=self.filename, md5=self.tgz_md5)
                                                   ^
torchvision/datasets/stl10.py:181: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                self.root, self.base_folder, self.folds_list_file)
                ^
torchvision/datasets/semeion.py:46: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            fp = os.path.join(self.root, self.filename)
                              ^
torchvision/datasets/semeion.py:81: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            fpath = os.path.join(root, self.filename)
                                 ^
torchvision/datasets/semeion.py:92: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            download_url(self.url, root, self.filename, self.md5_checksum)
                                   ^
torchvision/datasets/sbu.py:48: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            file1 = os.path.join(self.root, 'dataset', 'SBU_captioned_photo_dataset_urls.txt')
                                 ^
torchvision/datasets/sbu.py:49: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            file2 = os.path.join(self.root, 'dataset', 'SBU_captioned_photo_dataset_captions.txt')
                                 ^
torchvision/datasets/sbu.py:54: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                filename = os.path.join(self.root, 'dataset', photo)
                                        ^
torchvision/datasets/sbu.py:68: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            filename = os.path.join(self.root, 'dataset', self.photos[index])
                                    ^
torchvision/datasets/sbu.py:86: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            fpath = os.path.join(root, self.filename)
                                 ^
torchvision/datasets/sbu.py:99: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            download_url(self.url, self.root, self.filename, self.md5_checksum)
                                   ^
torchvision/datasets/sbu.py:102: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            with tarfile.open(os.path.join(self.root, self.filename), 'r:gz') as tar:
                                           ^
torchvision/datasets/sbu.py:106: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            with open(os.path.join(self.root, 'dataset', 'SBU_captioned_photo_dataset_urls.txt')) as fh:
                                   ^
torchvision/datasets/sbu.py:110: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                        download_url(url, os.path.join(self.root, 'dataset'))
                                                       ^
torchvision/datasets/sbd.py:75: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            image_dir = os.path.join(sbd_root, 'img')
                                     ^
torchvision/datasets/sbd.py:76: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            mask_dir = os.path.join(sbd_root, 'cls')
                                    ^
torchvision/datasets/sbd.py:79: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                download_and_extract_archive(self.url, self.root, filename=self.filename, md5=self.md5)
                                                       ^
torchvision/datasets/sbd.py:80: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                extracted_ds_root = os.path.join(self.root, "benchmark_RELEASE", "dataset")
                                                 ^
torchvision/datasets/sbd.py:83: error: Argument 2 to "move" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                    shutil.move(old_path, sbd_root)
                                          ^
torchvision/datasets/sbd.py:84: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                download_url(self.voc_train_url, sbd_root, self.voc_split_filename,
                                                 ^
torchvision/datasets/sbd.py:91: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            split_f = os.path.join(sbd_root, image_set.rstrip('\n') + '.txt')
                                   ^
torchvision/datasets/places365.py:108: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            return path.join(self.root, dir)
                             ^
torchvision/datasets/places365.py:116: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            file = path.join(self.root, file)
                             ^
torchvision/datasets/places365.py:131: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            file = path.join(self.root, file)
                             ^
torchvision/datasets/places365.py:143: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
            download_and_extract_archive(urljoin(self._BASE_URL, file), self.root, md5=md5)
                                                                        ^
torchvision/datasets/places365.py:153: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
            download_and_extract_archive(urljoin(self._BASE_URL, file), self.root, md5=md5)
                                                                        ^
torchvision/datasets/phototour.py:83: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.data_dir = os.path.join(self.root, name)
                                         ^
torchvision/datasets/phototour.py:84: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.data_down = os.path.join(self.root, '{}.zip'.format(name))
                                          ^
torchvision/datasets/phototour.py:85: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.data_file = os.path.join(self.root, '{}.pt'.format(name))
                                          ^
torchvision/datasets/phototour.py:139: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                fpath = os.path.join(self.root, filename)
                                     ^
torchvision/datasets/phototour.py:141: error: Argument 2 to "download_url" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                download_url(url, self.root, filename, md5)
                                  ^
torchvision/datasets/omniglot.py:50: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.target_folder = join(self.root, self._get_target_folder())
                                      ^
torchvision/datasets/omniglot.py:83: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            if not check_integrity(join(self.root, zip_filename + '.zip'), self.zips_md5[zip_filename]):
                                        ^
torchvision/datasets/omniglot.py:95: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
            download_and_extract_archive(url, self.root, filename=zip_filename, md5=self.zips_md5[filename])
                                              ^
torchvision/datasets/mnist.py:147: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            return os.path.join(self.root, self.__class__.__name__, 'raw')
                                ^
torchvision/datasets/mnist.py:151: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            return os.path.join(self.root, self.__class__.__name__, 'processed')
                                ^
torchvision/datasets/kitti.py:135: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            return os.path.join(self.root, self.__class__.__name__, "raw")
                                ^
torchvision/datasets/imagenet.py:69: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            if not check_integrity(os.path.join(self.root, META_FILE)):
                                                ^
torchvision/datasets/imagenet.py:70: error: Argument 1 to "parse_devkit_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                parse_devkit_archive(self.root)
                                     ^
torchvision/datasets/imagenet.py:74: error: Argument 1 to "parse_train_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                    parse_train_archive(self.root)
                                        ^
torchvision/datasets/imagenet.py:76: error: Argument 1 to "parse_val_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
                    parse_val_archive(self.root)
                                      ^
torchvision/datasets/imagenet.py:80: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            return os.path.join(self.root, self.split)
                                ^
torchvision/datasets/cityscapes.py:113: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.images_dir = os.path.join(self.root, 'leftImg8bit', split)
                                           ^
torchvision/datasets/cityscapes.py:114: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.targets_dir = os.path.join(self.root, self.mode, split)
                                            ^
torchvision/datasets/cityscapes.py:139: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                    image_dir_zip = os.path.join(self.root, 'leftImg8bit{}'.format('_trainextra.zip'))
                                                 ^
torchvision/datasets/cityscapes.py:141: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                    image_dir_zip = os.path.join(self.root, 'leftImg8bit{}'.format('_trainvaltest.zip'))
                                                 ^
torchvision/datasets/cityscapes.py:144: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                    target_dir_zip = os.path.join(self.root, '{}{}'.format(self.mode, '_trainvaltest.zip'))
                                                  ^
torchvision/datasets/cityscapes.py:146: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                    target_dir_zip = os.path.join(self.root, '{}{}'.format(self.mode, '.zip'))
                                                  ^
torchvision/datasets/cityscapes.py:149: error: Argument "to_path" to "extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Optional[str]" 
[arg-type]
                    extract_archive(from_path=image_dir_zip, to_path=self.root)
                                                                     ^
torchvision/datasets/cityscapes.py:150: error: Argument "to_path" to "extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Optional[str]" 
[arg-type]
                    extract_archive(from_path=target_dir_zip, to_path=self.root)
                                                                      ^
torchvision/datasets/cifar.py:83: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                file_path = os.path.join(self.root, self.base_folder, file_name)
                                         ^
torchvision/datasets/cifar.py:98: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            path = os.path.join(self.root, self.base_folder, self.meta['filename'])
                                ^
torchvision/datasets/cifar.py:136: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                fpath = os.path.join(root, self.base_folder, filename)
                                     ^
torchvision/datasets/cifar.py:145: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str"  [arg-type]
            download_and_extract_archive(self.url, self.root, filename=self.filename, md5=self.tgz_md5)
                                                   ^
torchvision/datasets/celeba.py:134: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                fpath = os.path.join(self.root, self.base_folder, filename)
                                     ^
torchvision/datasets/celeba.py:142: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            return os.path.isdir(os.path.join(self.root, self.base_folder, "img_align_celeba"))
                                              ^
torchvision/datasets/celeba.py:152: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                download_file_from_google_drive(file_id, os.path.join(self.root, self.base_folder), filename, md5)
                                                                      ^
torchvision/datasets/celeba.py:154: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            with zipfile.ZipFile(os.path.join(self.root, self.base_folder, "img_align_celeba.zip"), "r") as f:
                                              ^
torchvision/datasets/celeba.py:155: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                f.extractall(os.path.join(self.root, self.base_folder))
                                          ^
torchvision/datasets/celeba.py:158: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            X = PIL.Image.open(os.path.join(self.root, self.base_folder, "img_align_celeba", self.filename[index]))
                                            ^
torchvision/datasets/caltech.py:57: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            self.categories = sorted(os.listdir(os.path.join(self.root, "101_ObjectCategories")))
                                                             ^
torchvision/datasets/caltech.py:72: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                n = len(os.listdir(os.path.join(self.root, "101_ObjectCategories", c)))
                                                ^
torchvision/datasets/caltech.py:86: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
            img = Image.open(os.path.join(self.root,
                                          ^
torchvision/datasets/caltech.py:96: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]"  [arg-type]
                    data = scipy.io.loadmat(os.path.join(self.root,
                                                         ^
torchvision/datasets/caltech.py:113: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            return os.path.exists(os.path.join(self.root, "101_ObjectCategories"))
                                               ^
torchvision/datasets/caltech.py:125: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
                self.root,
                ^
torchvision/datasets/caltech.py:130: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
                self.root,
                ^
torchvision/datasets/caltech.py:172: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            self.categories = sorted(os.listdir(os.path.join(self.root, "256_ObjectCategories")))
                                                             ^
torchvision/datasets/caltech.py:176: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
                n = len(os.listdir(os.path.join(self.root, "256_ObjectCategories", c)))
                                                ^
torchvision/datasets/caltech.py:188: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            img = Image.open(os.path.join(self.root,
                                          ^
torchvision/datasets/caltech.py:205: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            return os.path.exists(os.path.join(self.root, "256_ObjectCategories"))
                                               ^
torchvision/datasets/caltech.py:217: error: Argument 2 to "download_and_extract_archive" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "str" 
[arg-type]
                self.root,
                ^
torchvision/datasets/kinetics.py:171: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            tar_path = path.join(self.root, "tars")
                                 ^
torchvision/datasets/kinetics.py:172: error: Argument 1 to "join" has incompatible type "Union[str, bytes, _PathLike[Any]]"; expected "Union[str, _PathLike[str]]" 
[arg-type]
            file_list_path = path.join(self.root, "files")
                                       ^