message: Support rsqrt for graphdef export.
diff: @@ -1047,6 +1047,18 @@ void ConvertSqrtOperator(const TensorFlowSqrtOperator& src_op,
  (*sqrt_op->mutable_attr())["T"].set_type(DT_FLOAT);
  }
  +void ConvertRsqrtOperator(const Model& model,
  + const TensorFlowRsqrtOperator& src_op,
  + GraphDef* tensorflow_graph) {
  + auto* rsqrt_op = tensorflow_graph->add_node();
  + rsqrt_op->set_op("Rsqrt");
  + rsqrt_op->set_name(src_op.outputs[0]);
  + CHECK_EQ(src_op.inputs.size(), 1);
  + *rsqrt_op->add_input() = src_op.inputs[0];
  + const auto data_type = GetTensorFlowDataType(model, src_op.inputs[0]);
  + (*rsqrt_op->mutable_attr())["T"].set_type(data_type);
  +}
  +
  void ConvertSplitOperator(const Model& model,
  const TensorFlowSplitOperator& src_op,
  GraphDef* tensorflow_graph) {
  @@ -1856,6 +1868,10 @@ void ConvertOperator(const Model& model, const Operator& src_op,
  } else if (src_op.type == OperatorType::kTensorFlowSqrt) {
  ConvertSqrtOperator(static_cast<const TensorFlowSqrtOperator&>(src_op),
  tensorflow_graph);
  + } else if (src_op.type == OperatorType::kTensorFlowRsqrt) {
  + ConvertRsqrtOperator(model,
  + static_cast<const TensorFlowRsqrtOperator&>(src_op),
  + tensorflow_graph);
  } else if (src_op.type == OperatorType::kTensorFlowSplit) {
  ConvertSplitOperator(model,
  static_cast<const TensorFlowSplitOperator&>(src_op),
  