code: def save_params(self, dirname):
      for i in range(self.ensemble_num):
          fluid.io.save_params(
              executor=self.fluid_executor,
              dirname=dirname,
              main_program=self.learn_programs[i],
          )
  
file_path: PARL/examples/NeurIPS2018-AI-for-Prosthetics-Challenge/opensim_agent.py
imports: import numpy
  import re
  import parl
  from parl import layers
  from paddle import fluid
  from paddle.fluid.executor import _fetch_var
  from parl.utils import logger
label_desc: Use image node_id 6 for calling the OpenSimAgent obj's underlying member method code with example usage: obj.save_params(dirname) without return types