code: def preprocess_atari_inputs(x):
      """Input normalization for Atari 2600 input frames."""
      return x.astype(jnp.float32) / 255.0
  
imports: import itertools
  import time
  from typing import Optional, Sequence, Tuple, Union
  from absl import logging
  from dopamine.discrete_domains import atari_lib
  from flax import linen
  import gin
  import jax
  import jax.numpy
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: preprocess_atari_inputs(x) and returns: unknown