code: def proba_vals(obs, state, mask):
      # Return fixed mean, std
      return np.array([-0.4]), np.array([[0.1]])
  
imports: import pytest
  import numpy
  from stable_baselines import A2C, ACKTR, PPO1, PPO2, TRPO
  from stable_baselines.common.identity_env import IdentityEnvBox
label_desc: Use image node_id 1 for calling the Helper obj's underlying member method code with example usage: obj.proba_vals(obs, state, mask) and returns: np,  np