---
base_model: sentence-transformers/all-MiniLM-L6-v2
library_name: transformers
pipeline_tag: text-classification
tags:
- cross-encoder-reranker
- l2
- repository-library
- repository_library_search_stack
- research-library
- retrieval
---

# Cross Encoder Reranker

Reranks retrieved candidates with a cross-encoder scoring pass.

## Model Details

- Artifact type: full fine-tuned model
- Base model: `sentence-transformers/all-MiniLM-L6-v2`
- Backbone type: `encoder`
- Model ID: `L2`
- Tier: `repository_library_search_stack`
- Role in stack: search-stack component for retrieval, reranking, or routing

This model is part of the Repository Library stack, a research system for indexing, retrieving, aligning, and reasoning over scientific papers, structured paper content, repositories, and cross-domain links between them.

## Model Sources

- Hugging Face repo: `https://huggingface.co/PeytonT/cross-encoder-reranker`
- Hugging Face collection: `https://huggingface.co/collections/PeytonT/research-library-6a49c589ef4d763f7539b50d`
- GitHub repository: `https://github.com/peytontolbert/research_library`
- Experiment config: `https://github.com/peytontolbert/research_library/blob/main/models/experiments/l2_cross_encoder_reranker.json`
- Models directory: `https://github.com/peytontolbert/research_library/tree/main/models`

## Intended Use

- Primary use: Reranks retrieved candidates with a cross-encoder scoring pass.
- Downstream use: retrieval, ranking, planning, paper understanding, or cross-domain reasoning inside the broader Repository Library system, depending on the model family.
- Out of scope: production safety claims, benchmark claims beyond the tracked experiment config, or deployment without task-specific validation.

## Training Data

The training inputs for this package were assembled from the following Repository Library data sources:

- Source `github_repos`: repository graph and code chunk data exported from the Repository Library repo pipeline.

## Training Procedure

- Sources: `github_repos`
- Input fields: `query, candidate_row`
- Target fields: `relevance_label`
- Train/val/test split: `[0.9, 0.1, 0.0]`
- Max samples: `4000`
- Batch size: `8`
- Precision: `bf16`
- Objective: `cross_entropy`
- Learning rate: `5e-05`
- Max source tokens: `256`
- Max target tokens: `256`
- Fine-tune strategy: `full_finetune`
- Max steps: `1000`
- Notes: Search-stack role added to match models.md coverage; dataset builder may need role-specific supervised labels before promotion.

## Compute

- Hardware: not specified
- Distributed strategy: `unknown`
- Estimated GPU hours in config: `unknown`

## Evaluation

- Declared metrics: `accuracy`
- Status: this card reflects the current tracked experiment configuration and packaged weights in the Repository Library model stack.

## Usage

```python
from transformers import AutoModelForSequenceClassification, AutoTokenizer

repo_id = "PeytonT/cross-encoder-reranker"

tokenizer = AutoTokenizer.from_pretrained(repo_id)
model = AutoModelForSequenceClassification.from_pretrained(repo_id)
```

## Limitations

- These cards are generated from tracked experiment metadata and packaged artifacts, not from a separate benchmark report or external audit.
- Several training sources are pipeline outputs from the Repository Library codebase rather than standalone public datasets.
- These models are components of a larger research system and should be validated in their target workflow before deployment.

## Project Context

- GitHub repository: `https://github.com/peytontolbert/research_library`
- Model collection: `https://huggingface.co/collections/PeytonT/research-library-6a49c589ef4d763f7539b50d`
- Publisher: `PeytonT`