code: def __len__(self):
      return len(self.blocks)
  
file_path: euler/tf_euler/python/dataflow/base_dataflow.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
label_desc: Use image node_id 3 for calling the DataFlow obj's underlying member method code with example usage: obj.__len__() and returns: len