code: def get_adjusted_environment_spec(
      environment_spec: specs.EnvironmentSpec, stack_size: int
  ) -> specs.EnvironmentSpec:
      """Returns a spec where the observation spec accounts for stacking."""
  
      def stack_observation_spec(obs_spec: specs.Array) -> specs.Array:
          """Adjusts last axis shape to account for observation stacking."""
          new_shape = obs_spec.shape[:-1] + (
              obs_spec.shape[-1] * stack_size,
          )
          return obs_spec.replace(shape=new_shape)
  
      adjusted_observation_spec = jax.tree_map(
          stack_observation_spec, environment_spec.observations
      )
  
      return environment_spec._replace(
          observations=adjusted_observation_spec
      )
  
imports: from typing import Any, Mapping, NamedTuple, Tuple
  from acme import specs
  from acme import types
  from acme.agents.jax import actor_core
  from acme.jax import networks
  from acme.jax import types
  from acme.jax import utils
  from acme.tf import utils
  import jax
  import jax.numpy
  import reverb
  import tensorflow
  import tree
label_desc: Use image node_id 2 for calling a global function with example usage: get_adjusted_environment_spec(environment_spec, stack_size) and returns: environment_spec, obs_spec