Fixed bug.

Author: trebedea

nemoguardrails/eval/evaluate_topical.py

@@ -69,6 +69,7 @@ def _initialize_rails_app(self):
 
     def _initialize_embeddings_model(self):
         """Instantiate a sentence transformer if we use a similarity check for canonical forms."""
+        self._model = None
         if self.similarity_threshold > 0:
             self._model = SentenceTransformer("all-MiniLM-L6-v2")