trl

Train language models with reinforcement learning workflows including SFT, reward modeling, RLHF, and DPO.

Updated Apr 19, 2026

Search Tags:#llm #ppo #dpo #trl #rlhf #reward-model

Ready to run

npx skills add https://github.com/CHENyiru3/AI-Skills-Collections --skill trl-chenyiru3

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: trl
Source: https://github.com/CHENyiru3/AI-Skills-Collections/tree/main/skills-market/ai-ml/llm/trl
Command: npx skills add https://github.com/CHENyiru3/AI-Skills-Collections --skill trl-chenyiru3

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Streamlines end-to-end reinforcement-learning workflows for language model training, covering SFT, reward modeling, RLHF, and DPO in a cohesive toolkit.

Core Features & Use Cases

Full-stack TRL support for supervised fine-tuning, reward modeling, PPO-based RLHF, and Direct Preference Optimization.
Integrates with transformers and PEFT for efficient fine-tuning, plus bitsandbytes for quantization.
Use cases include instruction-following alignment, preference learning, and scalable policy optimization across datasets.

Quick Start

Configure an SFT or RLHF workflow and run trainer.train() on your prepared dataset.

Frequently Asked Questions about trl

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I run PPO or DPO for RLHF on my language model?▼

You can run PPO or DPO for RLHF by configuring the specific trainer for your workflow and calling trainer.train() on your prepared dataset. This toolkit provides full-stack support for reinforcement learning-based language model training.

What's the best way to align an instruction-following model using preference data?▼

The best way to align an instruction-following model is using Direct Preference Optimization (DPO) or reward modeling. This requires formatting your dataset correctly and configuring the respective trainer for preference-based reward learning.

Can I use PEFT and bitsandbytes for quantization during RLHF training?▼

Yes, you can use PEFT for parameter-efficient fine-tuning and bitsandbytes for efficient quantization. The RLHF workflows integrate directly with these libraries to support scalable policy optimization across datasets.

How does Direct Preference Optimization differ from PPO-based RLHF?▼

Direct Preference Optimization (DPO) streamlines policy optimization by directly learning from preference data, bypassing explicit reward modeling. PPO-based RLHF requires training a separate reward model first, then optimizing the policy against it.

Do I need to perform supervised fine-tuning before starting reward modeling?▼

Supervised fine-tuning (SFT) is generally the foundational step in the workflow. You prepare your dataset, configure the SFT trainer, and run trainer.train() to establish a baseline model before advancing to reward modeling or RLHF.

Why does my RLHF trainer configuration fail on unformatted datasets?▼

RLHF trainers require clear data formatting to map instructions, references, and evaluation prompts correctly. Without properly structured preference or instruction datasets, the trainer cannot process the inputs for iterative policy optimization.