verl-rl-training

Configure Verl backends and launch GRPO-based RL fine-tuning jobs.

1.0k|117|Updated Feb 26, 2026
One-click install
npx skills add https://github.com/OpenLAIR/dr-claw --skill verl-rl-training-openlair
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: verl-rl-training
Source: https://github.com/OpenLAIR/dr-claw/tree/main/skills/post-training/verl
Command: npx skills add https://github.com/OpenLAIR/dr-claw --skill verl-rl-training-openlair

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Provides structured guidance for performing reinforcement learning-based fine-tuning of large language models using Verl (Volcano Engine RL), enabling scalable, production-grade RL workflows.

Core Features & Use Cases

  • Training backends: FSDP, FSDP2, Megatron-LM with flexible backend support for large-scale training.
  • Rollout engines: vLLM, SGLang, HuggingFace Transformers for diverse inference backends.
  • Algorithms: PPO, GRPO, RLOO, REINFORCE++, DAPO, SPIN (and related hybrids) to cover common RL scenarios.
  • Use cases: Scale RLHF workflows and post-training campaigns across enterprise-grade infrastructures.

Quick Start

Launch a basic GRPO-based RL training job with Verl using your dataset and a base model.

Frequently Asked Questions about verl-rl-training

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

FAQPage Schema
How do I perform RLHF fine-tuning for large language models at scale?▼

Production RL training for LLMs requires orchestrating distributed training backends with inference rollout engines. Using Verl, you can configure these components to execute scalable post-training campaigns with algorithms like PPO and GRPO.

What reinforcement learning algorithms are supported for LLM post-training?▼

Supported reinforcement learning algorithms for LLM post-training include PPO, GRPO, RLOO, REINFORCE++, DAPO, and SPIN. These cover common RL scenarios, allowing you to select the appropriate method for your specific reward optimization workflow.

Does Verl work with FSDP and Megatron-LM for distributed training?▼

Yes, Verl works with FSDP, FSDP2, and Megatron-LM to provide flexible backend support for large-scale training. This allows you to leverage existing distributed computing infrastructure for your RL fine-tuning campaigns.

Can I use vLLM and SGLang as rollout engines for RL fine-tuning?▼

Yes, you can use vLLM and SGLang as rollout engines for RL fine-tuning, alongside HuggingFace Transformers. This flexibility allows you to optimize inference workloads across diverse backends during the training process.

How do I launch a basic GRPO training job with Verl?▼

To launch a basic GRPO training job with Verl, you need to configure your dataset and a base model within the provided quick start workflow. This initiates the RL training process using the GRPO algorithm for post-training.

What is the best way to scale RLHF workflows across enterprise infrastructure?▼

Scaling RLHF workflows across enterprise infrastructure is best achieved by utilizing flexible training backends like FSDP2 and Megatron-LM paired with efficient rollout engines. Verl structures this orchestration to handle large-scale post-training campaigns effectively.