Only write updated dataset_info.json when adding a new format

PiperOrigin-RevId: 684334542

Author: tomvdw

tensorflow_datasets/core/dataset_info.py

@@ -668,6 +668,10 @@ def write_to_directory(
           self.redistribution_info.license
       )
 
+    self.write_dataset_info_json(dataset_info_dir)
+
+  def write_dataset_info_json(self, dataset_info_dir: epath.PathLike) -> None:
+    """Writes only the dataset_info.json file to the given directory."""
     dataset_info_path(dataset_info_dir).write_text(self.as_json)
 
   def read_from_directory(self, dataset_info_dir: epath.PathLike) -> None:

tensorflow_datasets/scripts/cli/convert_format_utils.py

@@ -178,7 +178,7 @@ def convert_metadata(
     # Add the file format to `alternative_file_formats` field.
     if out_file_format not in info.alternative_file_formats:
       info.add_alternative_file_format(out_file_format.value)
-      info.write_to_directory(out_path)
+      info.write_dataset_info_json(out_path)
     else:
       logging.info(
           'File format %s is already an alternative file format of the dataset'