Create imagefolder.py

imagefolder.py

@@ -0,0 +1,53 @@
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Optional
+
+import pyarrow as pa
+
+import datasets
+
+
+logger = datasets.utils.logging.get_logger(__name__)
+
+
+@dataclass
+class ImageFolderConfig(datasets.BuilderConfig):
+    """BuilderConfig for ImageFolder."""
+
+    features: Optional[datasets.Features] = None
+
+    @property
+    def schema(self):
+        return pa.schema(self.features.type) if self.features is not None else None
+
+
+class ImageFolder(datasets.GeneratorBasedBuilder):
+
+    BUILDER_CONFIG_CLASS = ImageFolderConfig
+
+    def _info(self):
+        return datasets.DatasetInfo(
+            features=datasets.Features(
+                {"image_file_path": datasets.Value("string"), "labels": datasets.Value("string")}
+            ),
+        )
+
+    def _split_generators(self, dl_manager):
+        if not self.config.data_files:
+            raise ValueError(f"At least one data file must be specified, but got data_files={self.config.data_files}")
+
+        data_files = self.config.data_files
+        if isinstance(data_files, str):
+            folder = data_files
+            return [datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"archive_path": folder})]
+        splits = []
+        for split_name, folder in data_files.items():
+            splits.append(datasets.SplitGenerator(name=split_name, gen_kwargs={"archive_path": folder}))
+        return splits
+
+    def _generate_examples(self, archive_path):
+        logger.info("generating examples from = %s", archive_path)
+        extensions = {".jpg", ".jpeg", ".png", ".ppm", ".bmp", ".pgm", ".tif", ".tiff", ".webp"}
+        for i, path in enumerate(Path(archive_path).glob("**/*")):
+            if path.suffix in extensions:
+                yield i, {"image_file_path": path.as_posix(), "labels": path.parent.name.lower()}