message: Adds summarize tool to graph I/O answer
diff: @@ -30,18 +30,20 @@ Since the number of TensorFlow Lite operations is smaller than TensorFlow's,
  some inference models may not be able to convert. For unimplemented operations,
  take a look at the question on
  [missing operators](faq.md#why-are-some-operations-not-implemented-in-tensorflow-lite).
  -Unsupported operators include embeddings and LSTM/RNNs.
  -For conversion issues not related to missing operations, search our
  +Unsupported operators include embeddings and LSTM/RNNs. For conversion issues
  +not related to missing operations, search our
  [GitHub issues](https://github.com/tensorflow/tensorflow/issues?q=label%3Acomp%3Alite+)
  or file a [new one](https://github.com/tensorflow/tensorflow/issues).
  #### How do I determine the inputs/outputs for GraphDef protocol buffer?
  -The recommended approach is to visualize the GraphDef with
  -[TensorBoard](https://www.tensorflow.org/guide/summaries_and_tensorboard) and
  -look for the inputs and outputs in the graph.
  +The easiest way to inspect a graph from a `.pb` file is to use the
  +[summarize_graph](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/graph_transforms/README.md#inspecting-graphs)
  +tool.
  -To visualize a `.pb` file, use the
  +If that approach yields an error, you can visualize the GraphDef with
  +[TensorBoard](https://www.tensorflow.org/guide/summaries_and_tensorboard) and
  +look for the inputs and outputs in the graph. To visualize a `.pb` file, use the
  [`import_pb_to_tensorboard.py`](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/python/tools/import_pb_to_tensorboard.py)
  script like below:
  