Add dataset loading script

dataset.py

@@ -0,0 +1,39 @@
+.# dataset.py
+import json
+import os
+from datasets import GeneratorBasedBuilder, DatasetInfo, SplitGenerator, Split, Features, Value, Sequence, Image
+
+class TLPD(GeneratorBasedBuilder):
+    def _info(self):
+        return DatasetInfo(
+            features=Features({
+                "image": Image(),
+                "label": Value("string"),
+                "points": Sequence(Sequence(Value("float32")))
+            }),
+            description="TLPD: Taiwan License Plate Dataset with polygon labels from LabelMe.",
+        )
+
+    def _split_generators(self, dl_manager):
+        return [
+            SplitGenerator(
+                name=Split.TRAIN,
+                gen_kwargs={"images_dir": "images", "labels_dir": "labels"}
+            )
+        ]
+
+    def _generate_examples(self, images_dir, labels_dir):
+        for fname in sorted(os.listdir(labels_dir)):
+            if fname.endswith(".json"):
+                json_path = os.path.join(labels_dir, fname)
+                with open(json_path, "r") as f:
+                    data = json.load(f)
+                image_name = data["imagePath"]
+                image_path = os.path.join(images_dir, image_name)
+                points = data["shapes"][0]["points"]
+                label = data["shapes"][0]["label"]
+                yield fname, {
+                    "image": image_path,
+                    "label": label,
+                    "points": points
+                }