code: def make_q_func(self, env):
      return make_distrib_ff_q_func(env)
  
imports: import unittest
  import basetest_dqn_like
  import numpy
  import pytest
  import torch
  from basetest_training import _TestBatchTrainingMixin
  import pfrl
  from pfrl.agents import CategoricalDQN, categorical_dqn
  from pfrl.agents.categorical_dqn import compute_value_loss, compute_weighted_value_loss
label_desc: Use image node_id 1 for calling the TestCategoricalDQNOnDiscreteABC obj's underlying member method code with example usage: obj.make_q_func(env) and returns: make_distrib_ff_q_func