code: def _check_block_size(flag_value):
      try:
          _parse_block_size_flag(flag_value)
          return True
      except:
          raise flags.ValidationError(
              'Invalid block size value "%s".' % flag_value
          )
  
file_path: model-optimization/tensorflow_model_optimization/python/core/sparsity/keras/tools/evaluate_pruning.py
imports: from __future__ import print_function
  import os
  import tempfile
  import textwrap
  import zipfile
  from absl import app
  from absl import flags
  import tensorflow
  from tensorflow_model_optimization.python.core.sparsity.keras import prune
  from tensorflow_model_optimization.python.core.sparsity.keras.tools import sparsity_tooling
label_desc: Use image node_id 2 for calling a global function with example usage: _check_block_size(flag_value) and returns: True