"    node_def {"
      "      name: 'add2'"
      "      op: 'Add'"
      "      input: 'add1:z:0'"
      "      input: 'read2:value:0'"
      "      attr {"
      "        key: 'T'"
      "        value {"
      "          type: DT_FLOAT"
      "        }"
      "      }"
      "    }"
      "    ret {"
      "      key: 'sum'"
      "      value: 'add2:z:0'"
      "    }",
      &def));

            return new Integer(3);
        }

        /**
         * @param arg1
         * @param arg2
         * @return int
         */
        public int add2(final int arg1, final int arg2) {
            return arg1 + arg2;
        }

        /**
         * @param arg
         * @return Integer
         */
        public Integer echo(final Integer arg) {