Check if allowed tokens is None (#2694)

* Upgrade outlines to 0.1.1

* Update for new API

* Check if allowed tokens is None

---------

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

server/poetry.lock

@@ -3976,4 +3976,4 @@ torch = ["torch"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.9,<3.13"
-content-hash = "5b2536579dd1d4013da43c5260666cab1c6575c8c1dd6ebb1ccfd5dc0f2874fd"
+content-hash = "40be820ced080c2457b0794ed61fdd5340615f0fe75420985eaaca7b2b6c3968"

server/text_generation_server/utils/logits_process.py

@@ -498,8 +498,9 @@ class GrammarLogitProcessor(LogitsProcessor):
     ):
         if fsm_grammar_state == -1 or self.fsm is None:
             return logits
-        allowed_tokens = self.fsm.allowed_token_ids(fsm_grammar_state)
+        allowed_tokens = self.fsm.get_next_instruction(fsm_grammar_state).tokens
         mask = torch.full_like(logits, -math.inf)
+        if allowed_tokens is not None:
 	    mask[:, allowed_tokens] = 0
         biased_scores = logits + mask
         return biased_scores
@@ -589,6 +590,7 @@ class HeterogeneousGrammarLogitProcessor(LogitsProcessor):
             if fsm_grammar_states[i] == -1 or fsm is None:
                 continue
             allowed_tokens = fsm.get_next_instruction(fsm_grammar_states[i]).tokens
+            if allowed_tokens is not None:
                 mask[i, allowed_tokens] = 0
             logits[i] += mask[i]
         return logits