Merge pull request #717 from RasaHQ/fallback_listen

predict action listen after fallback

rasa_core/policies/fallback.py

@@ -93,7 +93,12 @@ def predict_action_probabilities(self, tracker, domain):
         # to not override standard behaviour
         nlu_confidence = nlu_data["intent"].get("confidence", 1.0)
 
-        if self.should_fallback(nlu_confidence, tracker.latest_action_name):
+        # if the last action was fallback, we should always predict
+        # action listen after
+        if tracker.latest_action_name == self.fallback_action_name:
+            idx = domain.index_for_action('action_listen')
+            score = 1.1
+        elif self.should_fallback(nlu_confidence, tracker.latest_action_name):
             logger.debug("NLU confidence {} is lower "
                          "than NLU threshold {}. "
                          "Predicting fallback action: {}"