---
language: en
license: apache-2.0
library_name: crom-efficientllm
tags:
- rag
- llm
- retrieval
- rerank
- reranker
- context-management
- prompt-engineering
- observability
- python
---
# CRoM-Context-Rot-Mitigation--EfficientLLM: Context Reranking and Management for Efficient LLMs

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**CRoM (Context Rot Mitigation)-EfficientLLM** is a Python toolkit designed to optimize the context provided to Large Language Models (LLMs). It provides a suite of tools to intelligently select, re-rank, and manage text chunks to fit within a model\'s context budget while maximizing relevance and minimizing performance drift.

This project is ideal for developers building RAG (Retrieval-Augmented Generation) pipelines who need to make the most of limited context windows.

## Key Features

*   **Budget Packer:** Greedily packs the highest-scoring text chunks into a defined token budget using a stable sorting algorithm.
*   **Hybrid Reranker:** Combines sparse (TF-IDF) and dense (Sentence-Transformers) retrieval scores for robust and high-quality reranking of documents.
*   **Drift Estimator:** Monitors the semantic drift between sequential model responses using L2 or cosine distance with EWMA smoothing.
*   **Observability:** Exposes Prometheus metrics for monitoring token savings and drift alerts in production.
*   **Extensible Plugins:** Supports optional plugins for advanced reranking (`FlashRank`), compression (`LLMLingua`), and drift analysis (`Evidently`).
*   **Comprehensive Benchmarking:** Includes a CLI for end-to-end pipeline evaluation, budget sweeps, and quality-vs-optimal analysis.

## Installation

Install the package directly from source using pip. For development, it\'s recommended to install in editable mode with the `[dev]` extras.

```bash
# Clone the repository
git clone https://github.com/Flamehaven/CRoM-Context-Rot-Mitigation--EfficientLLM.git
cd CRoM-Context-Rot-Mitigation--EfficientLLM

# Install in editable mode with development and plugin dependencies
pip install -e .[dev,plugins]
```

## Quickstart

### Demo

Run a simple, self-contained demonstration of the core components:

```bash
# Run the demo script
crom-demo demo
```

### CLI Benchmarking Examples

The package includes a powerful `crom-bench` CLI for evaluation.

```bash
# Default E2E (Search→Rerank→Pack→Mock LLM)
crom-bench e2e --budget 0.3

# Optional: High-precision configuration with plugins
crom-bench e2e --budget 0.3 \
  --use-flashrank --flashrank-model ms-marco-TinyBERT-L-2-v2 \
  --use-llmlingua --compress-ratio=0.6 \
  --use-evidently
```

### Plotting

If `matplotlib` is installed (`pip install -e .[dev]`), you can save benchmark plots directly:

```bash
# Save budget sweep result plots
crom-bench sweep --save-plots

# Save DP-curve plots
crom-bench dp-curve --save-plots
```

## Release & Changelog

This project follows semantic versioning. For detailed changes, see the [**CHANGELOG.md**](CHANGELOG.md).

Releases are automated via GitHub Actions when a `v*` tag is pushed.

## License

This project is licensed under the Apache 2.0 License. See the [LICENSE](LICENSE) file for details.