title: tensorflow lite toco python APl: NameError: "name 'tempfile' is not defined"
body: <p>I ran the example from <a href="https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/lite/toco/g3doc/python_api.md" rel="nofollow noreferrer">https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/lite/toco/g3doc/python_api.md</a></p>
  
  <pre><code>import tensorflow as tf
  
  img = tf.placeholder(name="img", dtype=tf.float32, shape=(1, 64, 64, 3))
  val = img + tf.constant([1., 2., 3.]) + tf.constant([1., 4., 4.])
  out = tf.identity(val, name="out")
  with tf.Session() as sess:
    tflite_model = tf.contrib.lite.toco_convert(sess.graph_def, [img], [out])
    open("test.tflite", "wb").write(tflite_modeL)
  </code></pre>
  
  <p>but I got the error as "NameError: name 'tempfile' is not defined" in python3 and "NameError: global name 'tempfile' is not defined" in python2</p>
  
  <pre><code>NameError                                 Traceback (most recent call last)
  &lt;ipython-input-21-24c36564faa4&gt; in &lt;module&gt;()
        5 out = tf.identity(val, name="out")
        6 with tf.Session() as sess:
  ----&gt; 7   tflite_model = tf.contrib.lite.toco_convert(sess.graph_def, [img], [out])
    8   open("test.tflite", "wb").write(tflite_modeL)
  
  python3.5/site-packages/tensorflow/contrib/lite/python/lite.py in toco_convert(input_data, input_tensors, output_tensors, inference_type, input_format, output_format, quantized_input_stats, drop_control_dependency)
      196   data = toco_convert_protos(model.SerializeToString(),
      197                              toco.SerializeToString(),
  --&gt; 198                              input_data.SerializeToString())
      199   return data
      200 
  
  python3.5/site-packages/tensorflow/contrib/lite/python/lite.py in toco_convert_protos(model_flags_str, toco_flags_str, input_data_str)
       89     return _toco_convert_protos(model_flags_str, toco_flags_str, input_data_str)
       90 
  ---&gt; 91   with tempfile.NamedTemporaryFile() as fp_toco, \
       92            tempfile.NamedTemporaryFile() as fp_model, \
       93            tempfile.NamedTemporaryFile() as fp_input, \
  
  NameError: name 'tempfile' is not defined
  </code></pre>
  
  <p>How to make it work?</p>