code: def make_a2c_agent(self, env, model, opt, gpu, num_processes):
      return A2C(
          model,
          opt,
          gpu=gpu,
          gamma=0.99,
          num_processes=num_processes,
          use_gae=self.use_gae,
      )
  
imports: import os
  import tempfile
  import numpy
  import pytest
  import torch
  from torch import nn
  import pfrl
  from pfrl.agents.a2c import A2C
  from pfrl.envs.abc import ABC
  from pfrl.experiments.evaluator import batch_run_evaluation_episodes
  from pfrl.nn import Branched
  from pfrl.policies import GaussianHeadWithStateIndependentCovariance, SoftmaxCategoricalHead
label_desc: Use image node_id 8 for calling the TestA2C obj's underlying member method code with example usage: obj.make_a2c_agent(env, model, opt, gpu, num_processes) and returns: A2C