Cross-Encoder for MS Marco

本模型基于 MS Marco Passage Ranking 任务进行训练。

该模型可用于信息检索：给定一个查询，对所有可能的段落进行编码（例如使用 ElasticSearch 检索）。然后按降序排列段落。更多详情请参阅 SBERT.net Retrieve & Re-rank。训练代码见：SBERT.net Training MS Marco

与 SentenceTransformers 配合使用

当您已安装 SentenceTransformers 时，使用预训练模型非常方便：

from sentence_transformers import CrossEncoder

model = CrossEncoder('cross-encoder/ms-marco-MiniLM-L6-v2')
scores = model.predict([
    ("How many people live in Berlin?", "Berlin had a population of 3,520,031 registered inhabitants in an area of 891.82 square kilometers."),
    ("How many people live in Berlin?", "Berlin is well known for its museums."),
])
print(scores)
# [ 8.607138 -4.320078]

与 Transformers 配合使用

from transformers import AutoTokenizer, AutoModelForSequenceClassification
import torch

model = AutoModelForSequenceClassification.from_pretrained('cross-encoder/ms-marco-MiniLM-L6-v2')
tokenizer = AutoTokenizer.from_pretrained('cross-encoder/ms-marco-MiniLM-L6-v2')

features = tokenizer(['How many people live in Berlin?', 'How many people live in Berlin?'], ['Berlin has a population of 3,520,031 registered inhabitants in an area of 891.82 square kilometers.', 'New York City is famous for the Metropolitan Museum of Art.'],  padding=True, truncation=True, return_tensors="pt")

model.eval()
with torch.no_grad():
    scores = model(**features).logits
    print(scores)

性能

下表展示了各种预训练 Cross-Encoder 在 TREC Deep Learning 2019 和 MS Marco Passage Reranking 数据集上的性能。

注：运行时间基于 V100 GPU 计算。