Fix CPPE-5 dataset feature access

train_rtdetr_detection.py

@@ -72,8 +72,8 @@ if MAX_TRAIN_SAMPLES:
     dataset["test"] = dataset["test"].select(range(min(100, len(dataset["test"]))))
     print(f"Using {len(dataset['train'])} train, {len(dataset['test'])} test samples")
 
-# Get categories
-categories = dataset["train"].features["objects"].feature["category"].names
+# Get categories - CPPE-5 uses ClassLabel in objects dict
+categories = dataset["train"].features["objects"]["category"].feature.names
 id2label = {i: label for i, label in enumerate(categories)}
 label2id = {label: i for i, label in enumerate(categories)}
 print(f"Classes: {categories}")