code: def categorical_grid(dim: Categorical, num: int):
      """Build categorical grid, that is, all categories"""
      categories = dim.interval()
      if len(categories) != num:
          log.warning(
              f"Categorical dimension {dim.name} does not have {num} choices: {categories}. "
              "Will use {len(categories)} choices instead."
          )
      return categories
  
imports: from __future__ import annotations
  import itertools
  import logging
  import numpy
  from orion.algo.base import BaseAlgorithm
  from orion.algo.space import Categorical, Dimension, Fidelity, Integer, Real, Space
  from orion.core.utils import format_trials
label_desc: Use image node_id 3 for calling a global function with example usage: categorical_grid(dim, num) and returns: categories