Write `DatasetInfo` as JSON to `dataset_info_dir`.

def write_to_directory(self, dataset_info_dir):
    """Write `DatasetInfo` as JSON to `dataset_info_dir`."""
    # Save the metadata from the features (vocabulary, labels,...)
    if self.features:
      self.features.save_metadata(dataset_info_dir)

    if self.redistribution_info.license:
      with tf.io.gfile.GFile(self._license_filename(dataset_info_dir),
                             "w") as f:
        f.write(self.redistribution_info.license)

    with tf.io.gfile.GFile(self._dataset_info_filename(dataset_info_dir),
                           "w") as f:
      f.write(self.as_json)