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base_model: meta-llama/Meta-Llama-3-8B
library_name: peft
license: llama3
tags:
- sparse-retrieval
- information-retrieval
- msmarco
---
# AdaSparse-8B (LLaMA-3-8B, MS MARCO)
AdaSparse sparse retriever built on `meta-llama/Meta-Llama-3-8B`, trained on MS MARCO with
contrastive + knowledge-distillation loss, an adaptive top-k pruning and a learned per-term threshold. This repository
contains the LoRA adapter (including the learned `q_thres`/`d_thres` thresholding modules),
the tokenizer, and the retriever config.
## Usage
Requires the [AdaSparse](https://github.com/ViViVidam/AdaSparse) codebase:
```python
import torch
from transformers import AutoTokenizer
from scaling_retriever.modeling.llm_encoder import LlamaBiSparse
model = LlamaBiSparse.load_from_lora("Johonson/adasparse-8B")
tokenizer = AutoTokenizer.from_pretrained("Johonson/adasparse-8B")
queries = ["What is the capital of France?"]
passages = ["Paris is the capital of France."]
tokenized_queries = tokenizer(queries, max_length=192, truncation=True,
padding="longest", return_tensors="pt")
tokenized_passages = tokenizer(passages, max_length=192, truncation=True,
padding="longest", return_tensors="pt")
query_embeds = model.query_encode(**tokenized_queries)
doc_embeds = model.doc_encode(**tokenized_passages)
scores = torch.matmul(query_embeds, doc_embeds.T)
```
Note: the base model `meta-llama/Meta-Llama-3-8B` is gated — request access on its model page first.
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