class_docstr: TF GRU Cell with extra customization params. 
class_docstr_tok: ["TF","GRU","Cell","with","extra","customization","params","."]
code: def state_size(self):
      return self._num_units
  
imports: from __future__ import division, print_function, absolute_import
  import logging
  import numpy
  import tensorflow.compat.v1
  from tensorflow.python.ops import array_ops
  from tensorflow.python.util.nest import is_sequence
  from ..None import config
  from ..None import utils
  from ..None import activations
  from ..None import initializations
  from ..None import variables
  from .normalization import batch_normalization
label_desc: Use image node_id 2 for calling the GRUCell obj's underlying member method code with example usage: obj.state_size() and returns: self