This commit is contained in:
yumoqing 2025-06-21 09:56:42 +08:00
parent db6f2fa39a
commit 388ece4b18
2 changed files with 38 additions and 2 deletions

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@ -1,7 +1,9 @@
import torch
classs BaseReranker:
def __init__(self, model_id, **kw):
self.model_id = model_id
def use_mps_if_prosible(self):
if torch.backends.mps.is_available():
device = torch.device("mps")
@ -35,10 +37,14 @@ classs BaseReranker:
scores = batch_scores[:, 1].exp().tolist()
return scores
def rerank(self, query, docs, top_n=5, sys_prompt="", task=""):
def build_pairs(self, query, docs, sys_prompt="", task=""):
sys_str = self.build_sys_prompt(sys_prompt)
ass_str = self.build_assistant_prompt()
pairs = [ sys_str + '\n' + self.build_user_prompt(task, query, doc) + '\n' + ass_str for doc in docs ]
return pairs
def rerank(self, query, docs, top_n=5, sys_prompt="", task=""):
pairs = self.build_pairs(query, docs, sys_prompt=sys_prompt, task=task)
inputs = self.process_inputs(pairs)
scores = self.compute_logits(inputs)
data = []

30
llmengine/bge_reranker.py Normal file
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@ -0,0 +1,30 @@
import torch
from transformers import AutoModelForSequenceClassification, AutoTokenizer
from llmengine.base_reranker import BaseReranker, llm_register
class BgeReranker(BaseReranker):
def __init__(self, model_id, max_length=8096):
if 'bge-reranker' not in model_id:
e = Exception(f'{model_id} is not a bge-reranker')
raise e
self.tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForSequenceClassification.from_pretrained(model_id)
model.eval()
self.model = model
self.model_id = model_id
self.model_name = model_id.split('/')[-1]
def build_pairs(self, query, docs, **kw):
return [[query, doc] for doc in docs]
def process_inputs(self, pairs):
inputs = tokenizer(pairs, padding=True,
truncation=True, return_tensors='pt', max_length=512)
return inputs
def compute_logits(self, inputs):
scores = self.model(**inputs,
return_dict=True).logits.view(-1, ).float()
return scores
llm_register('bge-reranker', BgeReranker)