Fix a spelling mistake in train.py.

code/train.py

@@ -125,7 +125,7 @@ if __name__ == "__main__":
     logger.info('Experiment id: {}'.format(experiment_id))
 
     """
-    If the experiment configuration isn't comming from
+    If the experiment configuration isn't coming from
     an already existing file, save it to a json file to
     keep trace of it.
     """