code: def __call__(self, x):
      self.count += 1
      return x
  
imports: import itertools
  from absl.testing import parameterized
  from sonnet.src import test_utils
  from sonnet.src.nets import mlp
  import tensorflow
label_desc: Use image node_id 2 for calling the CountingActivation obj's underlying member method code with example usage: obj.__call__(x) and returns: x