code: def get_initial_trajectory(
      config: MPPIConfig, env_spec: specs.EnvironmentSpec
  ):
      """Returns the initial empty trajectory `T_0`."""
      return jnp.zeros(
          (max(1, config.horizon),) + env_spec.actions.shape
      )
  
file_path: acme/acme/agents/jax/mbop/mppi.py
imports: import dataclasses
  import functools
  from typing import Callable, Optional
  from acme import specs
  from acme.agents.jax.mbop import models
  from acme.jax import networks
  import jax
  from jax import random
  import jax.numpy
label_desc: Use image node_id 3 for calling a global function with example usage: get_initial_trajectory(config, env_spec) and returns: jnp