fix: router test bug fixes

semantic_router/index/local.py

@@ -42,8 +42,23 @@ class LocalIndex(BaseIndex):
             self.routes = np.concatenate([self.routes, routes_arr])
             self.utterances = np.concatenate([self.utterances, utterances_arr])
 
-    def _remove_and_sync(self, routes_to_delete: dict):
-        logger.warning(f"Sync remove is not implemented for {self.__class__.__name__}.")
+    def _remove_and_sync(self, routes_to_delete: dict) -> np.ndarray:
+        if self.index is None or self.routes is None or self.utterances is None:
+            raise ValueError("Index, routes, or utterances are not populated.")
+        # TODO JB: implement routes and utterances as a numpy array
+        route_utterances = np.array([self.routes, self.utterances]).T
+        # initialize our mask with all true values (ie keep all)
+        mask = np.ones(len(route_utterances), dtype=bool)
+        for route, utterances in routes_to_delete.items():
+            # TODO JB: we should be able to vectorize this?
+            for utterance in utterances:
+                mask &= ~((route_utterances[:, 0] == route) & (route_utterances[:, 1] == utterance))
+        # apply the mask to index, routes, and utterances
+        self.index = self.index[mask]
+        self.routes = self.routes[mask]
+        self.utterances = self.utterances[mask]
+        # return what was removed
+        return route_utterances[~mask]
 
     def get_utterances(self) -> List[Utterance]:
         """