class_docstr: Optimizer that implements the YellowFin algorithm.
  
  See [Zhang et. al., 2017](https://arxiv.org/abs/1706.03471) for details.
docstr: Get lr minimizing the surrogate.
  
  Returns:
    The lr_t.
docstr_tok: ["Get","lr","minimizing","the","surrogate",".","Returns",":","The","lr_t","."]
code: def _get_lr_tensor(self):
      """Get lr minimizing the surrogate.
  
      Returns:
        The lr_t.
      """
      lr = tf.squared_difference(1.0, tf.sqrt(self._mu)) / self._h_min
      return lr
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow.compat.v1
label_desc: Use image node_id 8 for calling the YellowFinOptimizer obj's underlying member method code with example usage: obj._get_lr_tensor() and returns: lr