[Frontend] API support for beam search for MQLLMEngine (#9117)

vllm/utils.py

@@ -1370,22 +1370,3 @@ class AtomicCounter:
     @property
     def value(self):
         return self._value
-
-
-def get_beam_search_score(
-    tokens: List[int],
-    cumulative_logprob: float,
-    eos_token_id: int,
-    length_penalty: float = 1.0,
-) -> float:
-    """Calculate the beam search score with length penalty.
-
-    Adapted from
-
-    https://github.com/huggingface/transformers/blob/ccb92be23def445f2afdea94c31286f84b89eb5b/src/transformers/generation/beam_search.py#L938
-    """
-    seq_len = len(tokens)
-    if tokens[-1] == eos_token_id:
-        seq_len -= 1
-
-    return cumulative_logprob / (seq_len**length_penalty)