try to let 0 example happens here

piano_sound_quality.py

@@ -105,7 +105,8 @@ class piano_sound_quality(datasets.GeneratorBasedBuilder):
 
         for index in _URLS.keys():
             for file in dl_manager.iter_files([data_files[index]]):
-                dataset.append(file)
+                if file.endswith(".wav"):
+                    dataset.append(file)
 
         random.shuffle(dataset)
         count = len(dataset)
@@ -135,10 +136,8 @@ class piano_sound_quality(datasets.GeneratorBasedBuilder):
 
     def _generate_examples(self, files):
         for i, path in enumerate(files):
-            file_name = os.path.basename(path)
-            if file_name.endswith(".wav"):
-                yield i, {
-                    "audio": path,
-                    "label": os.path.basename(os.path.dirname(path)),
-                    "pitch": _PITCHES[file_name[1:4]],
-                }
+            yield i, {
+                "audio": path,
+                "label": os.path.basename(os.path.dirname(path)),
+                "pitch": _PITCHES[os.path.basename(path)[1:4]],
+            }