• 动手学习RAG: 向量模型
• 动手学习RAG: moka-ai/m3e 模型微调deepspeed与对比学习
• 动手学习RAG：rerank模型微调实践 bge-reranker-v2-m3
• 动手学习RAG：迟交互模型colbert微调实践 bge-m3
• 动手学习RAG: 大模型向量模型微调 intfloat/e5-mistral-7b-instruct
• 动手学习RAG：大模型重排模型 bge-reranker-v2-gemma微调

1. 环境准备

pip install transformers
pip install open-retrievals

• 注意安装时是pip install open-retrievals，但调用时只需要import retrievals
• 欢迎关注最新的更新 https://github.com/LongxingTan/open-retrievals

2. 使用Mistral作为向量模型

这里直接将query_instruction和document_instruction写进了text里

from retrievals import AutoModelForEmbeddingmodel_name = 'intfloat/e5-mistral-7b-instruct'
model = AutoModelForEmbedding.from_pretrained(model_name,pooling_method='last',use_fp16=True,)texts = [
'Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: how much protein should a female eat', 
'Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: summit define', 
"As a general guideline, the CDC's average requirement of protein for women ages 19 to 70 is 46 grams per day. But, as you can see from this chart, you'll need to increase that if you're expecting or training for a marathon. Check out the chart below to see how much protein you should be eating each day.", 
'Definition of summit for English Language Learners. : 1  the highest point of a mountain : the top of a mountain. : 2  the highest level. : 3  a meeting or series of meetings between the leaders of two or more governments.'
]embeds = model.encode(texts, normalize_embeddings=True)
print(embeds)scores = (embeds[:2] @ embeds[2:].T) * 100
print(scores.tolist())

• 也可以把prompt写在函数中

from retrievals import AutoModelForEmbeddingmodel_name = 'intfloat/e5-mistral-7b-instruct'
model = AutoModelForEmbedding.from_pretrained(model_name,pooling_method='last',use_fp16=True,query_instruction='Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: ',document_instruction='',)query_texts = ['how much protein should a female eat', 'summit define']
document_texts = ["As a general guideline, the CDC's average requirement of protein for women ages 19 to 70 is 46 grams per day. But, as you can see from this chart, you'll need to increase that if you're expecting or training for a marathon. Check out the chart below to see how much protein you should be eating each day.", 'Definition of summit for English Language Learners. : 1  the highest point of a mountain : the top of a mountain. : 2  the highest level. : 3  a meeting or series of meetings between the leaders of two or more governments.']query_embeds = model.encode(query_texts, normalize_embeddings=True, is_query=True)
print(query_embeds)doc_embeds = model.encode(document_texts, normalize_embeddings=True, is_query=False)
print(doc_embeds)scores = (query_embeds @ doc_embeds.T) * 100
print(scores.tolist())

3. LoRA微调E5-mistral向量模型

数据还是按照惯例采用t2-ranking

MODEL_NAME="intfloat/e5-mistral-7b-instruct"
TRAIN_DATA="/root/kag101/src/open-retrievals/t2/t2_ranking.jsonl"
OUTPUT_DIR="/root/kag101/src/open-retrievals/t2/ft_out"torchrun --nproc_per_node 1 \-m retrievals.pipelines.embed \--output_dir $OUTPUT_DIR \--overwrite_output_dir \--model_name_or_path $MODEL_NAME \--pooling_method last \--do_train \--data_name_or_path $TRAIN_DATA \--positive_key positive \--negative_key negative \--use_lora True \--query_instruction 'Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: ' \--document_instruction '' \--learning_rate 1e-5 \--bf16 \--num_train_epochs 3 \--per_device_train_batch_size 2 \--gradient_accumulation_steps 16 \--dataloader_drop_last True \--query_max_length 64 \--document_max_length 256 \--train_group_size 2 \--logging_strategy steps \--logging_steps 100 \--temperature 0.02 \--use_inbatch_negative false \--save_total_limit 1

由于trainer中可以使用多种方式使用多GPU，因此retrievals也都支持。

# torchrun --nnodes 1 --nproc-per-node 4
# deepspeed --include localhost:0,1,2,3
# CUDA_VISIBLE_DEVICES=1,2,3 python
# accelerate launch --config_file conf_ds.yaml \accelerate launch \--config_file conf_llm.yaml \llm_finetune_for_embed.py \--model_name_or_path mistralai/Mistral-7B-v0.1 \--train_data  \--output_dir output \

4. 评测

微调前性能 c-mteb t2-ranking score

微调后性能

微调后，map从0.651上升到0.699，mrr从0.758上升到0.808