class_docstr: Utility class for calculating gradients.
class_docstr_tok: ["Utility","class","for","calculating","gradients","."]
code: def _dot_grad(x, y, z, dz, op_dict, be):
      return (be.dot(dz, y.T), be.dot(x.T, dz))
  
imports: from __future__ import division
  from builtins import object, zip
  from neon.backends.backend import OpTreeNode, Tensor
  import numpy
  from functools import wraps
label_desc: Use image node_id 12 for calling the GradUtil obj's underlying member method code with example usage: obj._dot_grad(x, y, z, dz, op_dict, be) and returns: be,  be