message: Correct graph check in broadcast_to gradient.
diff: @@ -1135,7 +1135,7 @@ def _BroadcastToGrad(op, grad):
  input_value = op.inputs[0]
  broadcast_shape = op.inputs[1]
  input_value_shape = array_ops.shape(input_value)
  - if not context.executing_eagerly():
  + if not isinstance(broadcast_shape, ops.EagerTensor):
  broadcast_shape_static = tensor_shape.TensorShape(
  pywrap_tf_session.TF_TryEvaluateConstant_wrapper(
  broadcast_shape.graph._c_graph, broadcast_shape._as_tf_output())) # pylint: disable=protected-access
  