title: Tensorflow serving No versions of servable <MODEL> found under base path
body: <p>I was following <a href="https://medium.com/towards-data-science/how-to-deploy-machine-learning-models-with-tensorflow-part-2-containerize-it-db0ad7ca35a7" rel="noreferrer">this</a> tutorial to use <code>tensorflow serving</code> using my object detection model. I am using <a href="https://github.com/tensorflow/models/tree/master/object_detection" rel="noreferrer">tensorflow object detection</a> for generating the model. I have created a frozen model using <a href="https://github.com/tensorflow/models/blob/master/object_detection/g3doc/exporting_models.md" rel="noreferrer">this</a> exporter (the generated frozen model <strong>works</strong> using python script).</p>
  <p>The frozen graph directory has following contents ( nothing on <code>variables</code> directory)</p>
  <blockquote>
  <p>variables/</p>
  <p>saved_model.pb</p>
  </blockquote>
  <p>Now when I try to serve the model using the following command,</p>
  <pre><code>tensorflow_model_server --port=9000 --model_name=ssd --model_base_path=/serving/ssd_frozen/
  </code></pre>
  <p>It always shows me</p>
  <blockquote>
  <p>...</p>
  <p>tensorflow_serving/model_servers/server_core.cc:421]  (Re-)adding
  model: ssd 2017-08-07 10:22:43.892834: W
  tensorflow_serving/sources/storage_path/file_system_storage_path_source.cc:262]
  No versions of servable ssd found under base path /serving/ssd_frozen/
  2017-08-07 10:22:44.892901: W
  tensorflow_serving/sources/storage_path/file_system_storage_path_source.cc:262]
  No versions of servable ssd found under base path /serving/ssd_frozen/</p>
  <p>...</p>
  </blockquote>