class_docstr: Google robot pushing dataset.
code: def total_number_of_frames(self):
      # TODO(mbz): correct this number to be the real total number of frames.
      return 50 * 10 * 1000
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import io
  import os
  import numpy
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import video_utils
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling the VideoGoogleRobotPushing obj's underlying member method code with example usage: obj.total_number_of_frames() and returns: unknown