code: def compute_actions(
      self,
      obs_batch,
      state_batches=None,
      prev_action_batch=None,
      prev_reward_batch=None,
      episodes=None,
      explore=None,
      timestep=None,
      **kwargs,
  ):
      return obs_batch.argmax(axis=1), [], {}
  
imports: import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.env.multi_agent_env import MultiAgentEnv
  from ray.rllib.evaluation.rollout_worker import RolloutWorker
  from ray.rllib.examples.env.mock_env import MockEnv3
  from ray.rllib.policy import Policy
  from ray.rllib.utils import override
label_desc: Use image node_id 1 for calling the EchoPolicy obj's underlying member method code with example usage: obj.compute_actions(obs_batch, state_batches, prev_action_batch, prev_reward_batch, episodes, explore, timestep) and returns: obs_batch,  list,  dict