Reset to default lm attrs

language_model/attrs.json

@@ -1 +1 @@
-{"alpha": 0.5, "beta": 1.0, "unk_score_offset": -10.0, "score_boundary": true}
+{"alpha": 0.5, "beta": 1.5, "unk_score_offset": -10.0, "score_boundary": true}