Open-retrievals unify text embedding, retrieval, reranking and RAG. It's easy, flexible and scalable to fine-tune the model.
- Embedding fine-tuned through point-wise, pairwise, listwise, contrastive learning and LLM.
- Reranking fine-tuned with Cross-Encoder, ColBERT and LLM.
- Easily build enhanced modular RAG, integrated with Transformers, Langchain and LlamaIndex.
| Experiment | Model | Original | Finetuned | Demo |
|---|---|---|---|---|
| embed pairwise finetune | bge-base-zh-v1.5 | 0.657 | 0.703 |  |
| embed LLM finetune (LoRA) | e5-mistral-7b-instruct | 0.651 | 0.699 | |
| rerank cross encoder | bge-reranker-base | 0.666 | 0.706 | |
| rerank colbert | bge-m3 | 0.657 | 0.695 | |
| rerank LLM (LoRA) | bge-reranker-v2-gemma | 0.637 | 0.706 | |
- The eval metrics is MAP in 10% t2-reranking data.
- Read more examples
With pip
pip install transformers
pip install open-retrievalsEmbedding from pretrained weights
from retrievals import AutoModelForEmbedding
sentences = [
'query: how much protein should a female eat',
'query: summit define',
"passage: 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.",
"passage: 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."
]
model_name_or_path = 'intfloat/e5-base-v2'
model = AutoModelForEmbedding.from_pretrained(model_name_or_path, pooling_method="mean")
embeddings = model.encode(sentences, normalize_embeddings=True)
scores = (embeddings[:2] @ embeddings[2:].T) * 100
print(scores.tolist())Index building for dense retrieval search
from retrievals import AutoModelForEmbedding, AutoModelForRetrieval
sentences = ['A dog is chasing car.', 'A man is playing a guitar.']
model_name_or_path = "sentence-transformers/all-MiniLM-L6-v2"
index_path = './database/faiss/faiss.index'
model = AutoModelForEmbedding.from_pretrained(model_name_or_path, pooling_method='mean')
model.build_index(sentences, index_path=index_path)
query_embed = model.encode("He plays guitar.")
matcher = AutoModelForRetrieval()
dists, indices = matcher.search(query_embed, index_path=index_path)
print(indices)Rerank using pretrained weights
from retrievals import AutoModelForRanking
model_name_or_path: str = "BAAI/bge-reranker-base"
rerank_model = AutoModelForRanking.from_pretrained(model_name_or_path)
scores_list = rerank_model.compute_score(["In 1974, I won the championship in Southeast Asia in my first kickboxing match", "In 1982, I defeated the heavy hitter Ryu Long."])
print(scores_list)RAG with LangChain integration
pip install langchain
pip install langchain_community
pip install chromadbfrom retrievals.tools.langchain import LangchainEmbedding, LangchainReranker, LangchainLLM
from retrievals import AutoModelForRanking
from langchain.retrievers import ContextualCompressionRetriever
from langchain_community.vectorstores import Chroma as Vectorstore
from langchain.prompts.prompt import PromptTemplate
from langchain.chains import RetrievalQA
persist_directory = './database/faiss.index'
embed_model_name_or_path = "sentence-transformers/all-MiniLM-L6-v2"
rerank_model_name_or_path = "BAAI/bge-reranker-base"
llm_model_name_or_path = "microsoft/Phi-3-mini-128k-instruct"
embeddings = LangchainEmbedding(model_name=embed_model_name_or_path)
vectordb = Vectorstore(
persist_directory=persist_directory,
embedding_function=embeddings,
)
retrieval_args = {"search_type" :"similarity", "score_threshold": 0.15, "k": 10}
retriever = vectordb.as_retriever(**retrieval_args)
ranker = AutoModelForRanking.from_pretrained(rerank_model_name_or_path)
reranker = LangchainReranker(model=ranker, top_n=3)
compression_retriever = ContextualCompressionRetriever(
base_compressor=reranker, base_retriever=retriever
)
llm = LangchainLLM(model_name_or_path=llm_model_name_or_path)
RESPONSE_TEMPLATE = """[INST]
<>
You are a helpful AI assistant. Use the following pieces of context to answer the user's question.<>
Anything between the following `context` html blocks is retrieved from a knowledge base.
{context}
REMEMBER:
- If you don't know the answer, just say that you don't know, don't try to make up an answer.
- Let's take a deep breath and think step-by-step.
Question: {question}[/INST]
Helpful Answer:
"""
PROMPT = PromptTemplate(template=RESPONSE_TEMPLATE, input_variables=["context", "question"])
qa_chain = RetrievalQA.from_chain_type(
llm,
chain_type='stuff',
retriever=compression_retriever,
chain_type_kwargs={
"verbose": True,
"prompt": PROMPT,
}
)
user_query = 'Introduce this'
response = qa_chain({"query": user_query})
print(response)Fine-tune embedding
import torch.nn as nn
from datasets import load_dataset
from transformers import AutoTokenizer, AdamW, get_linear_schedule_with_warmup, TrainingArguments
from retrievals import AutoModelForEmbedding, RetrievalTrainer, PairCollator, TripletCollator
from retrievals.losses import ArcFaceAdaptiveMarginLoss, InfoNCE, SimCSE, TripletLoss
model_name_or_path: str = "sentence-transformers/paraphrase-multilingual-mpnet-base-v2"
batch_size: int = 32
epochs: int = 3
train_dataset = load_dataset('shibing624/nli_zh', 'STS-B')['train']
train_dataset = train_dataset.rename_columns({'sentence1': 'query', 'sentence2': 'positive'})
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
model = AutoModelForEmbedding.from_pretrained(model_name_or_path, pooling_method="mean")
model = model.set_train_type('pairwise')
optimizer = AdamW(model.parameters(), lr=5e-5)
num_train_steps = int(len(train_dataset) / batch_size * epochs)
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=0.05 * num_train_steps, num_training_steps=num_train_steps
)
training_arguments = TrainingArguments(
output_dir='./checkpoints',
num_train_epochs=epochs,
per_device_train_batch_size=batch_size,
remove_unused_columns=False,
logging_steps=100,
)
trainer = RetrievalTrainer(
model=model,
args=training_arguments,
train_dataset=train_dataset,
data_collator=PairCollator(tokenizer, query_max_length=32, document_max_length=128),
loss_fn=InfoNCE(nn.CrossEntropyLoss(label_smoothing=0.05)),
)
trainer.optimizer = optimizer
trainer.scheduler = scheduler
trainer.train()Fine-tune LLM embedding
import torch.nn as nn
from datasets import load_dataset
from transformers import AutoTokenizer, AdamW, get_linear_schedule_with_warmup, TrainingArguments
from retrievals import AutoModelForEmbedding, RetrievalTrainer, PairCollator, TripletCollator
from retrievals.losses import InfoNCE, SimCSE, TripletLoss
def add_instructions(example):
example['query'] = query_instruction + example['query']
example['positive'] = document_instruction + example['positive']
return example
model_name_or_path: str = "Qwen/Qwen2-1.5B-Instruct"
batch_size: int = 8
epochs: int = 3
query_instruction = "Retrieve relevant passages that answer the query\nQuery: "
document_instruction = "Document: "
train_dataset = load_dataset('shibing624/nli_zh', 'STS-B')['train']
train_dataset = train_dataset.rename_columns({'sentence1': 'query', 'sentence2': 'positive'})
train_dataset = train_dataset.map(add_instructions)
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
model = AutoModelForEmbedding.from_pretrained(model_name_or_path, pooling_method="last", use_lora=True)
model = model.set_train_type('pairwise', loss_fn=InfoNCE(nn.CrossEntropyLoss(label_smoothing=0.05)))
optimizer = AdamW(model.parameters(), lr=5e-5)
num_train_steps = int(len(train_dataset) / batch_size * epochs)
scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=0.05 * num_train_steps, num_training_steps=num_train_steps)
training_arguments = TrainingArguments(
output_dir='./checkpoints',
num_train_epochs=epochs,
per_device_train_batch_size=batch_size,
remove_unused_columns=False,
logging_steps=100,
)
trainer = RetrievalTrainer(
model=model,
args=training_arguments,
train_dataset=train_dataset,
data_collator=PairCollator(tokenizer, query_max_length=64, document_max_length=128),
)
trainer.optimizer = optimizer
trainer.scheduler = scheduler
trainer.train()Fine-tune cross-encoder reranking
from transformers import AutoTokenizer, TrainingArguments, get_cosine_schedule_with_warmup, AdamW
from retrievals import RerankCollator, AutoModelForRanking, RerankTrainer, RerankTrainDataset
model_name_or_path: str = "BAAI/bge-reranker-base"
max_length: int = 128
learning_rate: float = 3e-5
batch_size: int = 4
epochs: int = 3
output_dir: str = "./checkpoints"
train_dataset = RerankTrainDataset("C-MTEB/T2Reranking", positive_key="positive", negative_key="negative", dataset_split='dev')
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
model = AutoModelForRanking.from_pretrained(model_name_or_path)
optimizer = AdamW(model.parameters(), lr=learning_rate)
num_train_steps = int(len(train_dataset) / batch_size * epochs)
scheduler = get_cosine_schedule_with_warmup(
optimizer,
num_warmup_steps=0.05 * num_train_steps,
num_training_steps=num_train_steps,
)
training_args = TrainingArguments(
learning_rate=learning_rate,
per_device_train_batch_size=batch_size,
num_train_epochs=epochs,
output_dir=output_dir,
remove_unused_columns=False,
logging_steps=100,
report_to="none",
)
trainer = RerankTrainer(
model=model,
args=training_args,
train_dataset=train_dataset,
data_collator=RerankCollator(tokenizer, max_length=max_length),
)
trainer.optimizer = optimizer
trainer.scheduler = scheduler
trainer.train()Fine-tune ColBERT reranking
import os
import transformers
from transformers import (
AdamW,
AutoTokenizer,
TrainingArguments,
get_cosine_schedule_with_warmup,
)
from retrievals import ColBERT, ColBertCollator, RerankTrainer, RetrievalTrainDataset
from retrievals.losses import ColbertLoss
transformers.logging.set_verbosity_error()
os.environ["WANDB_DISABLED"] = "true"
model_name_or_path: str = "BAAI/bge-m3"
learning_rate: float = 5e-6
batch_size: int = 32
epochs: int = 3
colbert_dim: int = 1024
output_dir: str = './checkpoints'
train_dataset = RetrievalTrainDataset('C-MTEB/T2Reranking', positive_key='positive', negative_key='negative', dataset_split='dev')
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
data_collator = ColBertCollator(
tokenizer,
query_max_length=128,
document_max_length=256,
positive_key='positive',
negative_key='negative',
)
model = ColBERT.from_pretrained(
model_name_or_path,
colbert_dim=colbert_dim,
loss_fn=ColbertLoss(use_inbatch_negative=False),
)
optimizer = AdamW(model.parameters(), lr=learning_rate)
num_train_steps = int(len(train_dataset) / batch_size * epochs)
scheduler = get_cosine_schedule_with_warmup(optimizer, num_warmup_steps=0.05 * num_train_steps, num_training_steps=num_train_steps)
training_args = TrainingArguments(
learning_rate=learning_rate,
per_device_train_batch_size=batch_size,
num_train_epochs=epochs,
output_dir=output_dir,
remove_unused_columns=False,
logging_steps=100,
)
trainer = RerankTrainer(
model=model,
args=training_args,
train_dataset=train_dataset,
data_collator=data_collator,
)
trainer.optimizer = optimizer
trainer.scheduler = scheduler
trainer.train()Fine-tune LLM reranking
from transformers import (
AdamW,
AutoTokenizer,
TrainingArguments,
get_cosine_schedule_with_warmup,
)
from retrievals import (
LLMRanker,
LLMRerankCollator,
RerankTrainer,
RetrievalTrainDataset,
)
from retrievals.losses import TokenLoss
model_name_or_path: str = "Qwen/Qwen2-1.5B-Instruct"
max_length: int = 512
learning_rate: float = 3e-5
batch_size: int = 8
epochs: int = 3
task_prompt: str = (
"""Given a query A and a passage B, determine whether the passage contains an answer to the query"""
"""by providing a prediction of either 'Yes' or 'No'."""
)
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
train_dataset = RetrievalTrainDataset(
data_name_or_path='C-MTEB/T2Reranking',
positive_key='positive',
negative_key='negative',
query_instruction='A: ',
document_instruction='B: ',
dataset_split='dev',
)
data_collator = LLMRerankCollator(tokenizer=tokenizer, max_length=max_length, prompt=task_prompt, add_target_token='Yes')
token_index = tokenizer('Yes', add_special_tokens=False)['input_ids'][-1]
model = LLMRanker.from_pretrained(
model_name_or_path,
causal_lm=True,
use_fp16=True,
loss_fn=TokenLoss(token_index=token_index),
use_lora=True,
)
optimizer = AdamW(model.parameters(), lr=learning_rate)
num_train_steps = int(len(train_dataset) / batch_size * epochs)
scheduler = get_cosine_schedule_with_warmup(
optimizer,
num_warmup_steps=0.05 * num_train_steps,
num_training_steps=num_train_steps,
)
training_args = TrainingArguments(
learning_rate=learning_rate,
per_device_train_batch_size=batch_size,
num_train_epochs=epochs,
output_dir="./checkpoints",
remove_unused_columns=False,
)
trainer = RerankTrainer(
model=model,
args=training_args,
train_dataset=train_dataset,
data_collator=data_collator,
)
trainer.optimizer = optimizer
trainer.scheduler = scheduler
trainer.train()