<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update_session_entity_type( self, session_entity_type, update_mask=None, retry=google.api_core.gapic_v1.method.DEFAULT, timeout=google.api_core.gapic_v1.method.DEFAULT, metadata=None):
 """ Updates the specified session entity type. Example: Args: session_entity_type (Union[dict, ~google.cloud.dialogflow_v2.types.SessionEntityType]):
 Required. The entity type to update. Format: ``projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity Type Display Name>``. If a dict is provided, it must be of the same form as the protobuf message :class:`~google.cloud.dialogflow_v2.types.SessionEntityType` update_mask (Union[dict, ~google.cloud.dialogflow_v2.types.FieldMask]):
 Optional. The mask to control which fields get updated. If a dict is provided, it must be of the same form as the protobuf message :class:`~google.cloud.dialogflow_v2.types.FieldMask` retry (Optional[google.api_core.retry.Retry]):
 A retry object used to retry requests. If ``None`` is specified, requests will not be retried. timeout (Optional[float]):
 The amount of time, in seconds, to wait for the request to complete. Note that if ``retry`` is specified, the timeout applies to each individual attempt. metadata (Optional[Sequence[Tuple[str, str]]]):
 Additional metadata that is provided to the method. Returns: A :class:`~google.cloud.dialogflow_v2.types.SessionEntityType` instance. Raises: google.api_core.exceptions.GoogleAPICallError: If the request failed for any reason. google.api_core.exceptions.RetryError: If the request failed due to a retryable error and retry attempts failed. ValueError: If the parameters are invalid. """

        # Wrap the transport method to add retry and timeout logic.
        if 'update_session_entity_type' not in self._inner_api_calls:
            self._inner_api_calls[
                'update_session_entity_type'] = google.api_core.gapic_v1.method.wrap_method(
                    self.transport.update_session_entity_type,
                    default_retry=self._method_configs[
                        'UpdateSessionEntityType'].retry,
                    default_timeout=self._method_configs[
                        'UpdateSessionEntityType'].timeout,
                    client_info=self._client_info,
                )

        request = session_entity_type_pb2.UpdateSessionEntityTypeRequest(
            session_entity_type=session_entity_type,
            update_mask=update_mask,
        )
        return self._inner_api_calls['update_session_entity_type'](
            request, retry=retry, timeout=timeout, metadata=metadata)