title: AWS Blazing text supervised hyperparameter not logging objective metric
body: <p>I am running a Hyperparameter tuning job using Sagemakers built in training image for Blazing text (blazingtext:latest) however when my jobs complete they only log out #train accuracy:</p>
  
  <pre><code>...
  06:00:36 ##### Alpha: 0.0000 Progress: 100.00% Million Words/sec: 0.00 #####
  06:13:19 Training finished.
  06:13:19 Average throughput in Million words/sec: 0.00
  06:13:19 Total training time in seconds: 1888.88
  06:13:19 #train_accuracy: 0.4103
  06:13:19 Number of train examples: 55783
  </code></pre>
  
  <p>The Hyperparameter job does not allow for me to pick #train_accuracy as an objective metric, only "validation:accuracy" or train:mean_rho appear in the dropdown.
  <a href="https://i.stack.imgur.com/ICAmu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ICAmu.png" alt="Objective metric"></a></p>
  
  <p>After the job completes under "Best training job" tab I see:</p>
  
  <blockquote>
    <p>Best training job summary data is available when you have completed training jobs that are emiting metrics.</p>
  </blockquote>
  
  <p>Am I missing something obvious?</p>