code: def _load_params(self, dirname):
      logger.info(
          "[{}]: Loading model from {}".format(self.stage_name, dirname)
      )
      fluid.io.load_params(
          executor=self.fluid_executor,
          dirname=dirname,
          main_program=self.ensemble_predict_program,
      )
  
imports: import numpy
  import parl.layers
  from mlp_model import ActorModel, CriticModel
  from paddle import fluid
  from parl.utils import logger
label_desc: Use image node_id 2 for calling the EnsembleBaseModel obj's underlying member method code with example usage: obj._load_params(dirname) without return types