class_docstr: One categorical column in a dataset.
class_docstr_tok: ["One","categorical","column","in","a","dataset","."]
code: def __init__(self, col_num, col_name, num_levels, na_fraction):
      self.col_num = col_num
      self.col_name = col_name
      self.num_levels = num_levels
      self.na_fraction = na_fraction
  
imports: import sys
  import os
  import re
  from random import random
  from random import randrange
  from random import uniform
label_desc: Use image node_id 1 to create a new CategoricalColumn object  with example: obj = CategoricalColumn(col_num, col_name, num_levels, na_fraction)