class_docstr: CategoricalStats contains following basic information:
      - _total_count: total count of values
      - _frequency_count: a dictionary maps categorical value to its frequency count
code: def frequency_count(self):
      return self._frequency_count
  
file_path: contextual-ai/xai/data/explorer/categorical/categorical_stats.py
imports: from typing import Dict
  from xai.data.abstract_stats import AbstractStats
  from xai.data.constants import STATSKEY
  from xai.data.exceptions import InvalidTypeError
label_desc: Use image node_id 2 for calling the CategoricalStats obj's underlying member method code with example usage: obj.frequency_count() and returns: self