kaknikhil commented on a change in pull request #525:
URL: https://github.com/apache/madlib/pull/525#discussion_r560533501



##########
File path: src/ports/postgres/modules/deep_learning/madlib_keras.py_in
##########
@@ -520,21 +544,35 @@ def fit_transition(state, dependent_var, independent_var, 
dependent_var_shape,
         and only gets cleared in eval transition at the last row of the last 
iteration.
 
     """
-    if not independent_var or not dependent_var:
+    if not dependent_var_shape:
+        plpy.error("fit_transition called with no data")
+
+    if not prev_serialized_weights or not model_architecture:
         return state

Review comment:
       makes sense 




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