code: from tensorflow.python import pywrap_tensorflow
  checkpoint_path = 'checkpoints/VGGnet_fast_rcnn_iter_50000.ckpt'
  reader = pywrap_tensorflow.NewCheckpointReader(checkpoint_path)
  var_to_shape_map = reader.get_variable_to_shape_map()
  for key in var_to_shape_map:
      print("tensor_name: ", key)
  
apis: tensorflow.python.pywrap_tensorflow.NewCheckpointReader