code: def get_class_colors():
      """Returns a [num_classes, 3] array of colors for the model output labels."""
      cm = np.stack(
          [c.color for c in CLASSES if not c.ignore_in_eval], axis=0
      )
      return cm / 255.0
  
file_path: scenic/scenic/dataset_lib/cityscapes_dataset.py
imports: import collections
  import functools
  from typing import Optional
  from absl import logging
  import jax.numpy
  import numpy
  from scenic.dataset_lib import dataset_utils
  from scenic.dataset_lib import datasets
  import tensorflow
label_desc: Use image node_id 4 for calling a global function with example usage: get_class_colors() and returns: unknown