Node2vec - enforce that either negative_rate or hs are positive (#502)

python/mage/node2vec_online_module/w2v_learners.py

@@ -48,7 +48,7 @@ def partial_fit(self, sentences: List[List[Any]]) -> None:
                 "epochs": self.num_epochs,
                 "workers": self.threads,
             }
-            if self.negative_rate < 0:
+            if self.negative_rate <= 0:
                 self.negative_rate = 0
                 self.model = Word2Vec(
                     sentences, negative=self.negative_rate, hs=1, **params