title: google colab setting a '^C' in the proccess
body: <p>I'm running this <a href="https://drive.google.com/open?id=1gZTADeRnAX4li-yK-" rel="noreferrer">code</a> that i got from this <a href="https://www.youtube.com/watch?v=COlbP62-B-U&amp;list=PLQVvvaa0QuDcNK5GeCQnxYnSSaar2tpku" rel="noreferrer">tutorial</a>
  I'm trying running the tensorflow object detection api, all code work well, if you run all calls, all cell will works well, and in the end, my images are classified.</p>
  
  <p>Buuut have 1 cell that dont work well, it's work, but doesn't like it must work.</p>
  
  <p>When i will train my model with <code>!python legacy/train.py --logtostderr --train_dir=training/ --pipeline_config_path=training/ssd_mobilenet_v1_pets.config</code>
  it start the tensorflow and start the training, buuut it only run 3 steps, 4 steps, some times 20,21,23 steps and in the end, the google colab set a <code>^C</code> in the process</p>
  
  <p>I never can finish my training because the google colab close my process, some one know whatsap happening?</p>
  
  <p>I already try use GPU and TPU instances.</p>
  
  <pre><code>[...]
  INFO:tensorflow:Restoring parameters from training/model.ckpt-0
  I1022 20:41:48.368024 139794549495680 tf_logging.py:115] Restoring parameters from training/model.ckpt-0
  INFO:tensorflow:Running local_init_op.
  I1022 20:41:52.779153 139794549495680 tf_logging.py:115] Running local_init_op.
  INFO:tensorflow:Done running local_init_op.
  I1022 20:41:52.997912 139794549495680 tf_logging.py:115] Done running local_init_op.
  INFO:tensorflow:Starting Session.
  I1022 20:41:59.072830 139794549495680 tf_logging.py:115] Starting Session.
  INFO:tensorflow:Saving checkpoint to path training/model.ckpt
  I1022 20:41:59.245162 139793493063424 tf_logging.py:115] Saving checkpoint to path training/model.ckpt
  INFO:tensorflow:Starting Queues.
  I1022 20:41:59.252097 139794549495680 tf_logging.py:115] Starting Queues.
  INFO:tensorflow:global_step/sec: 0
  I1022 20:42:10.151180 139793484670720 tf_logging.py:159] global_step/sec: 0
  INFO:tensorflow:Recording summary at step 0.
  I1022 20:42:16.119055 139793476278016 tf_logging.py:115] Recording summary at step 0.
  INFO:tensorflow:global step 1: loss = 14.0911 (28.770 sec/step)
  I1022 20:42:28.496783 139794549495680 tf_logging.py:115] global step 1: loss = 14.0911 (28.770 sec/step)
  INFO:tensorflow:global step 2: loss = 12.4958 (10.529 sec/step)
  I1022 20:42:39.334129 139794549495680 tf_logging.py:115] global step 2: loss = 12.4958 (10.529 sec/step)
  INFO:tensorflow:global step 3: loss = 11.6073 (8.267 sec/step)
  I1022 20:42:47.601801 139794549495680 tf_logging.py:115] global step 3: loss = 11.6073 (8.267 sec/step)
  ^C
  </code></pre>