code: def __call__(self):
      if not hasattr(self, "v"):
          self.v = tf.Variable(1.0)
      return self.v
  
imports: import os
  from absl import logging
  from absl.testing import parameterized
  from sonnet.src import initializers
  from sonnet.src import test_utils
  from sonnet.src.distribute import replicator
  from sonnet.src.distribute import replicator_test_utils
  import tensorflow
label_desc: Use image node_id 1 for calling the TrainableVariable obj's underlying member method code with example usage: obj.__call__() and returns: self