fix url func

pianos.py

@@ -83,10 +83,10 @@ class pianos(datasets.GeneratorBasedBuilder):
         try:
             # easy for local test
             with socket.create_connection((ip, port), timeout=5):
-                return f'http://{ip}/{_NAME}/data/{_NAME}_data.zip'
+                return f'http://{ip}/{_NAME}/data/pianos_data.zip'
 
         except (socket.timeout, socket.error):
-            return f"{_HOMEPAGE}/resolve/main/data/{_NAME}_data.zip",
+            return f"{_HOMEPAGE}/resolve/main/data/pianos_data.zip"
 
     def _split_generators(self, dl_manager):
         data_files = dl_manager.download_and_extract(self._cdn_url())