Improve image extension handling, add methods to modify / get defaults. Fix #1335 fix #1274.

timm/data/__init__.py

@@ -6,7 +6,8 @@ from .dataset import ImageDataset, IterableImageDataset, AugMixDataset
 from .dataset_factory import create_dataset
 from .loader import create_loader
 from .mixup import Mixup, FastCollateMixup
-from .parsers import create_parser
+from .parsers import create_parser,\
+    get_img_extensions, is_img_extension, set_img_extensions, add_img_extensions, del_img_extensions
 from .real_labels import RealLabelsImagenet
 from .transforms import *
-from .transforms_factory import create_transform
+from .transforms_factory import create_transform

timm/data/parsers/__init__.py

@@ -1 +1,2 @@
 from .parser_factory import create_parser
+from .img_extensions import *

timm/data/parsers/constants.py

@@ -1 +0,0 @@
-IMG_EXTENSIONS = ('.png', '.jpg', '.jpeg')

timm/data/parsers/img_extensions.py

@@ -0,0 +1,50 @@
+from copy import deepcopy
+
+__all__ = ['get_img_extensions', 'is_img_extension', 'set_img_extensions', 'add_img_extensions', 'del_img_extensions']
+
+
+IMG_EXTENSIONS = ('.png', '.jpg', '.jpeg')  # singleton, kept public for bwd compat use
+_IMG_EXTENSIONS_SET = set(IMG_EXTENSIONS)  # set version, private, kept in sync
+
+
+def _set_extensions(extensions):
+    global IMG_EXTENSIONS
+    global _IMG_EXTENSIONS_SET
+    dedupe = set()  # NOTE de-duping tuple while keeping original order
+    IMG_EXTENSIONS = tuple(x for x in extensions if x not in dedupe and not dedupe.add(x))
+    _IMG_EXTENSIONS_SET = set(extensions)
+
+
+def _valid_extension(x: str):
+    return x and isinstance(x, str) and len(x) >= 2 and x.startswith('.')
+
+
+def is_img_extension(ext):
+    return ext in _IMG_EXTENSIONS_SET
+
+
+def get_img_extensions(as_set=False):
+    return deepcopy(_IMG_EXTENSIONS_SET if as_set else IMG_EXTENSIONS)
+
+
+def set_img_extensions(extensions):
+    assert len(extensions)
+    for x in extensions:
+        assert _valid_extension(x)
+    _set_extensions(extensions)
+
+
+def add_img_extensions(ext):
+    if not isinstance(ext, (list, tuple, set)):
+        ext = (ext,)
+    for x in ext:
+        assert _valid_extension(x)
+    extensions = IMG_EXTENSIONS + tuple(ext)
+    _set_extensions(extensions)
+
+
+def del_img_extensions(ext):
+    if not isinstance(ext, (list, tuple, set)):
+        ext = (ext,)
+    extensions = tuple(x for x in IMG_EXTENSIONS if x not in ext)
+    _set_extensions(extensions)

timm/data/parsers/parser_factory.py

@@ -1,7 +1,6 @@
 import os
 
 from .parser_image_folder import ParserImageFolder
-from .parser_image_tar import ParserImageTar
 from .parser_image_in_tar import ParserImageInTar
 
 

timm/data/parsers/parser_image_folder.py

@@ -6,15 +6,35 @@ on the folder hierarchy, just leaf folders by default.
 Hacked together by / Copyright 2020 Ross Wightman
 """
 import os
+from typing import Dict, List, Optional, Set, Tuple, Union
 
 from timm.utils.misc import natural_key
 
-from .parser import Parser
 from .class_map import load_class_map
-from .constants import IMG_EXTENSIONS
+from .img_extensions import get_img_extensions
+from .parser import Parser
 
 
-def find_images_and_targets(folder, types=IMG_EXTENSIONS, class_to_idx=None, leaf_name_only=True, sort=True):
+def find_images_and_targets(
+        folder: str,
+        types: Optional[Union[List, Tuple, Set]] = None,
+        class_to_idx: Optional[Dict] = None,
+        leaf_name_only: bool = True,
+        sort: bool = True
+):
+    """ Walk folder recursively to discover images and map them to classes by folder names.
+
+    Args:
+        folder: root of folder to recrusively search
+        types: types (file extensions) to search for in path
+        class_to_idx: specify mapping for class (folder name) to class index if set
+        leaf_name_only: use only leaf-name of folder walk for class names
+        sort: re-sort found images by name (for consistent ordering)
+
+    Returns:
+        A list of image and target tuples, class_to_idx mapping
+    """
+    types = get_img_extensions(as_set=True) if not types else set(types)
     labels = []
     filenames = []
     for root, subdirs, files in os.walk(folder, topdown=False, followlinks=True):
@@ -51,7 +71,8 @@ class ParserImageFolder(Parser):
         self.samples, self.class_to_idx = find_images_and_targets(root, class_to_idx=class_to_idx)
         if len(self.samples) == 0:
             raise RuntimeError(
-                f'Found 0 images in subfolders of {root}. Supported image extensions are {", ".join(IMG_EXTENSIONS)}')
+                f'Found 0 images in subfolders of {root}. '
+                f'Supported image extensions are {", ".join(get_img_extensions())}')
 
     def __getitem__(self, index):
         path, target = self.samples[index]

timm/data/parsers/parser_image_in_tar.py

@@ -9,20 +9,20 @@ Labels are based on the combined folder and/or tar name structure.
 
 Hacked together by / Copyright 2020 Ross Wightman
 """
-import os
-import tarfile
-import pickle
 import logging
-import numpy as np
+import os
+import pickle
+import tarfile
 from glob import glob
-from typing import List, Dict
+from typing import List, Tuple, Dict, Set, Optional, Union
+
+import numpy as np
 
 from timm.utils.misc import natural_key
 
-from .parser import Parser
 from .class_map import load_class_map
-from .constants import IMG_EXTENSIONS
-
+from .img_extensions import get_img_extensions
+from .parser import Parser
 
 _logger = logging.getLogger(__name__)
 CACHE_FILENAME_SUFFIX = '_tarinfos.pickle'
@@ -39,7 +39,7 @@ class TarState:
         self.tf = None
 
 
-def _extract_tarinfo(tf: tarfile.TarFile, parent_info: Dict, extensions=IMG_EXTENSIONS):
+def _extract_tarinfo(tf: tarfile.TarFile, parent_info: Dict, extensions: Set[str]):
     sample_count = 0
     for i, ti in enumerate(tf):
         if not ti.isfile():
@@ -60,7 +60,14 @@ def _extract_tarinfo(tf: tarfile.TarFile, parent_info: Dict, extensions=IMG_EXTE
     return sample_count
 
 
-def extract_tarinfos(root, class_name_to_idx=None, cache_tarinfo=None, extensions=IMG_EXTENSIONS, sort=True):
+def extract_tarinfos(
+        root,
+        class_name_to_idx: Optional[Dict] = None,
+        cache_tarinfo: Optional[bool] = None,
+        extensions: Optional[Union[List, Tuple, Set]] = None,
+        sort: bool = True
+):
+    extensions = get_img_extensions(as_set=True) if not extensions else set(extensions)
     root_is_tar = False
     if os.path.isfile(root):
         assert os.path.splitext(root)[-1].lower() == '.tar'
@@ -176,8 +183,8 @@ class ParserImageInTar(Parser):
         self.samples, self.targets, self.class_name_to_idx, tarfiles = extract_tarinfos(
             self.root,
             class_name_to_idx=class_name_to_idx,
-            cache_tarinfo=cache_tarinfo,
-            extensions=IMG_EXTENSIONS)
+            cache_tarinfo=cache_tarinfo
+        )
         self.class_idx_to_name = {v: k for k, v in self.class_name_to_idx.items()}
         if len(tarfiles) == 1 and tarfiles[0][0] is None:
             self.root_is_tar = True

timm/data/parsers/parser_image_tar.py

@@ -8,13 +8,15 @@ Hacked together by / Copyright 2020 Ross Wightman
 import os
 import tarfile
 
-from .parser import Parser
-from .class_map import load_class_map
-from .constants import IMG_EXTENSIONS
 from timm.utils.misc import natural_key
 
+from .class_map import load_class_map
+from .img_extensions import get_img_extensions
+from .parser import Parser
+
 
 def extract_tarinfo(tarfile, class_to_idx=None, sort=True):
+    extensions = get_img_extensions(as_set=True)
     files = []
     labels = []
     for ti in tarfile.getmembers():
@@ -23,7 +25,7 @@ def extract_tarinfo(tarfile, class_to_idx=None, sort=True):
         dirname, basename = os.path.split(ti.path)
         label = os.path.basename(dirname)
         ext = os.path.splitext(basename)[1]
-        if ext.lower() in IMG_EXTENSIONS:
+        if ext.lower() in extensions:
             files.append(ti)
             labels.append(label)
     if class_to_idx is None: