class_docstr: A fake adanet.Summary.
class_docstr_tok: ["A","fake","adanet.Summary","."]
code: def histogram(self, name, values, family=None):
      return "fake_histogram"
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import contextlib
  from absl.testing import parameterized
  from adanet import ensemble
  from adanet import subnetwork
  from adanet import tf_compat
  from adanet.core.summary import Summary
  import mock
  import tensorflow.compat.v2
  from tensorflow.python.eager import context
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 3 for calling the _FakeSummary obj's underlying member method code with example usage: obj.histogram(name, values, family) and returns: str