Add diagnostic logging for label mapping file loading

code/cube3d/training/process_single_ldr.py

@@ -121,12 +121,26 @@ def onehot_to_rotation(one_hot):
     return rotation_matrix
 
 def load_mappings(label_mapping_file, label_inverse_mapping_file):
-    with open(label_mapping_file, 'r') as f:
-        label_mapping = json.load(f)
-    
-    with open(label_inverse_mapping_file, 'r') as f:
-        label_inverse_mapping = json.load(f)
-    
+    print(f"🔍 [DEBUG] load_mappings() called")
+    print(f"   Forward file: {label_mapping_file}")
+    print(f"   Inverse file: {label_inverse_mapping_file}")
+
+    try:
+        with open(label_mapping_file, 'r') as f:
+            label_mapping = json.load(f)
+        print(f"   ✅ Forward mapping loaded: {len(label_mapping)} entries")
+    except Exception as e:
+        print(f"   ❌ Failed to load forward mapping: {e}")
+        raise
+
+    try:
+        with open(label_inverse_mapping_file, 'r') as f:
+            label_inverse_mapping = json.load(f)
+        print(f"   ✅ Inverse mapping loaded: {len(label_inverse_mapping)} entries")
+    except Exception as e:
+        print(f"   ❌ Failed to load inverse mapping: {e}")
+        raise
+
     return label_mapping, label_inverse_mapping
 
 # 读取LDR文件，逐行读取