title: Tensorflow Output for custom object detection
body: <p>I'm a newbee in using tensorflow. Why am I getting so many metrics while training custom tensorflow 2.x object detection?</p>
  <pre><code>Use fn_output_signature instead
  INFO:tensorflow:Step 100 per-step time 8.507s
  I0607 17:52:10.328038 16488 model_lib_v2.py:699] Step 100 per-step time 8.507s
  INFO:tensorflow:{'Loss/classification_loss': 21.313017,
   'Loss/localization_loss': 2.1917934,
   'Loss/regularization_loss': 221.82864,
   'Loss/total_loss': 245.33345,
   'learning_rate': 0.014666351}
  I0607 17:52:10.349220 16488 model_lib_v2.py:700] {'Loss/classification_loss': 21.313017,
   'Loss/localization_loss': 2.1917934,
   'Loss/regularization_loss': 221.82864,
   'Loss/total_loss': 245.33345,
   'learning_rate': 0.014666351}
  Use fn_output_signature instead
  INFO:tensorflow:Step 100 per-step time 8.507s
  I0607 17:52:10.328038 16488 model_lib_v2.py:699] Step 100 per-step time 8.507s
  INFO:tensorflow:{'Loss/classification_loss': 21.313017,
   'Loss/localization_loss': 2.1917934,
   'Loss/regularization_loss': 221.82864,
   'Loss/total_loss': 245.33345,
   'learning_rate': 0.014666351}
  I0607 17:52:10.349220 16488 model_lib_v2.py:700] {'Loss/classification_loss': 21.313017,
   'Loss/localization_loss': 2.1917934,
   'Loss/regularization_loss': 221.82864,
   'Loss/total_loss': 245.33345,
   'learning_rate': 0.014666351}
  </code></pre>