code: def receive_parameter(self) -> ParameterRecord | None:
      return self._params
  
file_path: nni/test/ut/sdk/helper/trial_command_channel.py
imports: from __future__ import annotations
  import copy
  from typing_extensions import Literal
  from nni.runtime.trial_command_channel import TrialCommandChannel
  from nni.typehint import TrialMetric, ParameterRecord
label_desc: Use image node_id 4 for calling the TestHelperTrialCommandChannel obj's underlying member method code with example usage: obj.receive_parameter() and returns: self