Reinforcement-learning-guidance

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Reinforcement-learning-guidance

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RLG: Inference-Time Alignment Control for Diffusion Models with Reinforcement Learning Guidance

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<h1 align="center"> RLG:<br>Inference-Time Alignment Control for Diffusion Models with Reinforcement Learning Guidance </h1>
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## ✨ Overview

This repository presents **Reinforcement Learning Guidance (RLG)**, an innovative inference-time method designed to enhance and control the alignment of diffusion models. RLG builds upon the widely used Classifier-Free Guidance (CFG) by introducing a novel approach: it harmonizes the outputs of a base diffusion model and an RL-fine-tuned model through a geometric average. This unique combination empowers users with dynamic and precise control over alignment strength *without requiring any additional training*.

## 🚀 Quick Start Guide

Let's get RLG up and running! Follow these simple steps to set up your environment and generate stunning images.

### 1. 🌐 Environment Setup

Begin by cloning the repository and installing the necessary packages.

```bash
git clone https://github.com/jinluo12345/Reinforcement-learning-guidance.git
cd Reinforcement-learning-guidance
conda create -n rlg python=3.10.16 -y
conda activate rlg # Activate your new environment
pip install -e .
```

### 2. ⬇️ Model Downloads

RLG requires both a reference base model and an RL-fine-tuned model to operate. Please download them in advance.

#### Base Model

RLG currently primarily supports `stable-diffusion-3.5` as its base model.

* **SD3.5**: Accessible via `stabilityai/stable-diffusion-3.5-medium`.

#### RL-fine-tuned Model

RLG currently supports models fine-tuned with Flow-GRPO.

* **PickScore Alignment**: Download from [🤗PickScore](https://huggingface.co/jieliu/SD3.5M-FlowGRPO-PickScore).
* **Text Rendering**: Download from [🤗Text](https://huggingface.co/jieliu/SD3.5M-FlowGRPO-Text).

#### Evaluation Models

For comprehensive evaluation, you might need these models:

* **PickScore**:

* `laion/CLIP-ViT-H-14-laion2B-s32B-b79K`
  * `yuvalkirstain/PickScore_v1`
* **Aesthetic Score**: `openai/clip-vit-large-patch14`
* **ImageReward Score**: `zai-org/ImageReward`

### 3. 🖼️ Image Generation

Unleash the power of RLG to generate images!

#### Running Inference with RLG

To generate images using the Reinforcement Learning Guidance (RLG) framework, use the following command:

```python
python scripts/generate.py \
  --config="config/dgx.py:pickscore_sd3" \
  --lora_path="{your downloaded RL-finetuned model's ckpt path}" \
  --tuned_guidance_scale=1.6 \
  --output_dir="logs/" \
  --prompt_file="dataset/pickscore/test.txt"
```

**Note:** If you wish to generate images using the *original base model* or the *RL-fine-tuned model without RLG*, simply set `tuned_guidance_scale` accordingly:

* Set `tuned_guidance_scale` to `0.0` for the original base model.
* Set `tuned_guidance_scale` to `1.0` for the original RL-fine-tuned model (sampling without RLG).

#### Parameter Descriptions

* `--config`: Specifies the configuration file and model setup (e.g., `config/dgx.py:pickscore_sd3` refers to the `pickscore_sd3` configuration in `dgx.py`, fine-tuned on PickScore reward).
* `--lora_path`: The file path to the LoRA (Low-Rank Adaptation) weights of your downloaded RL-fine-tuned model.
* `--tuned_guidance_scale`: Adjusts the strength of RL-guided alignment during inference.

* **Recommended range**: `1.0` to `3.0`.
  * Higher values enhance alignment but might reduce image diversity.
* `--output_dir`: The directory where all your magnificent generated images will be saved.
* `--prompt_file`: Path to a text file containing the prompts for image generation.

---

### 4. 📈 Evaluation Model Preparation

The above steps install tools for generation. Evaluation models, however, may have specific dependency versions that could conflict if installed in a single environment. To prevent this, install only the specific reward models you intend to use.

#### PickScore

PickScore requires no additional installation steps. It's ready to go!

#### ImageReward

To use ImageReward, install it along with the CLIP library:

```bash
pip install image-reward
pip install git+https://github.com/openai/CLIP.git
```

#### Running Evaluations

We provide scripts to evaluate Aesthetic Score, PickScore, and ImageReward. To run evaluations, use the following command:

```bash
python scripts/cal_aes.py --input_dir logs/ --batch_size 1
```

This script will by default evaluate all supported rewards and save the results into a CSV file within your input directories.

**Customizing Evaluation:** If you wish to evaluate only specific scores (e.g., just PickScore), you can modify the `score_dict` within `cal_aes.py` by setting other scores to `0.0`:

```python
# Example to evaluate only PickScore
score_dict = {
    "aesthetic": 0.0,
    "imagereward": 0.0,
    "pickscore": 1.0, # Enable PickScore evaluation
}
```

## 🤗 Acknowledgement
This repo is based on [Flow-GRPO](https://github.com/yifan123/flow_grpo). We thank the authors for their valuable contributions to the AIGC community. Special thanks to Liu Jie for the excellent *flow_grpo* repo.

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