class_docstr: A simple subnetwork builder that takes feature_columns.
code: def name(self):
      return self._name
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl import logging
  from adanet import tf_compat
  from adanet.core import testing_utils
  from adanet.core.estimator import Estimator
  from adanet.core.report_materializer import ReportMaterializer
  from adanet.subnetwork import Builder
  from adanet.subnetwork import SimpleGenerator
  from adanet.subnetwork import Subnetwork
  import tensorflow.compat.v2
  from tensorflow_estimator.python.estimator.head import regression_head
label_desc: Use image node_id 2 for calling the _SimpleBuilder obj's underlying member method code with example usage: obj.name() and returns: self