class_docstr: Optimizer implementing SGD.
code: def __init__(self, learning_rate):
      self._lr = learning_rate
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import functools
  import re
  import gin
  from mesh_tensorflow import layers
  from mesh_tensorflow import ops_with_redefined_builtins
  import tensorflow.compat.v1
label_desc: Use image node_id 1 to create a new SgdOptimizer object from inherited base classes: Optimizer with example: obj = SgdOptimizer(learning_rate)