<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def create_summary_metadata(display_name, description, num_thresholds):
 """Create a `summary_pb2.SummaryMetadata` proto for pr_curves plugin data. Arguments: display_name: The display name used in TensorBoard. description: The description to show in TensorBoard. num_thresholds: The number of thresholds to use for PR curves. Returns: A `summary_pb2.SummaryMetadata` protobuf object. """

  pr_curve_plugin_data = plugin_data_pb2.PrCurvePluginData(
      version=PROTO_VERSION, num_thresholds=num_thresholds)
  content = pr_curve_plugin_data.SerializeToString()
  return summary_pb2.SummaryMetadata(
      display_name=display_name,
      summary_description=description,
      plugin_data=summary_pb2.SummaryMetadata.PluginData(
          plugin_name=PLUGIN_NAME,
          content=content))