class_docstr: A fake adanet.Summary.
code: def scalar(self, name, tensor, family=None):
      del name
      del tensor
      del family
      return "fake_scalar"
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import contextlib
  from absl.testing import parameterized
  from adanet import tf_compat
  from adanet.core.candidate import _Candidate
  from adanet.core.candidate import _CandidateBuilder
  import adanet.core.testing_utils
  import tensorflow.compat.v2
  from tensorflow.python.eager import context
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 1 for calling the _FakeSummary obj's underlying member method code with example usage: obj.scalar(name, tensor, family) and returns: str