message: Fix error of make_graph in Protobufs.ipynb
diff: "outputs": [],
  "source": [
  "from onnx.onnx_pb2 import *\n",
  - "from onnx import checker, helper, registry"
  + "from onnx import checker, helper"
  ]
  },
  {
  " helper.make_node(\"FC\", [\"R1\", \"W2\", \"B2\"], [\"Y\"]),\n",
  " ],\n",
  " \"MLP\",\n",
  - " [\"X\", \"W1\", \"B1\", \"W2\", \"B2\"],\n",
  - " [\"Y\"]\n",
  + " [\n",
  + " helper.make_tensor_value_info('X' , TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('W1', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('B1', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('W2', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('B2', TensorProto.FLOAT, [1]),\n",
  + " ],\n",
  + " [\n",
  + " helper.make_tensor_value_info('Y', TensorProto.FLOAT, [1]),\n",
  + " ]\n",
  ")\n",
  "\n",
  "print(\"\\ngraph proto:\\n\")\n",
  " helper.make_node(\"FC\", [\"R1\", \"W2\", \"B2\"], [\"Y\"]),\n",
  " ],\n",
  " \"MLP\",\n",
  - " [\"X\", \"W1\", \"B1\", \"W2\", \"B2\"],\n",
  - " [\"Y\"]\n",
  + " [\n",
  + " helper.make_tensor_value_info('X' , TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('W1', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('B1', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('W2', TensorProto.FLOAT, [1]),\n",
  + " helper.make_tensor_value_info('B2', TensorProto.FLOAT, [1]),\n",
  + " ],\n",
  + " [\n",
  + " helper.make_tensor_value_info('Y', TensorProto.FLOAT, [1]),\n",
  + " ]\n",
  ")\n",
  "\n",
  "# output = ThisSpecificgraph([input, w1, b1, w2, b2])\n",
  