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This tutorial explains how to build a distributed reinforcement‑learning pipeline using the GRPO algorithm, covering data preparation, evaluation and reward functions, multi‑GPU DataParallel implementation, and full fine‑tuning of the Qwen2.5‑1.5B‑Instruct model with PyTorch, FlashAttention2 and Weights & Biases.
The article reviews reinforcement-learning fundamentals and the progression from policy-gradient to PPO, then introduces Group Relative Policy Optimization (GRPO)—a critic-free method that normalizes rewards across multiple sampled outputs to compute group-relative advantages—and shows how DeepSeek-R1 leverages GRPO with rule-based rewards to achieve strong reasoning performance.
This article explains how DeepSeek‑R1‑Zero uses group‑relative policy optimization (GRPO) to enhance inference without labeled data, introduces reinforcement learning with human feedback (RLHF) and its components, and compares the PPO and GRPO algorithms, highlighting their suitable engineering scenarios and practical implications for AI applications.
DeepSeek‑R1 demonstrates that large‑scale reinforcement learning, especially with the novel Group Relative Policy Optimization and a rule‑based reward scheme, can markedly boost reasoning in LLMs without heavy supervised fine‑tuning, while a brief cold‑start SFT phase, two‑stage alignment, and knowledge distillation further improve performance and efficiency, despite remaining challenges such as language mixing.
This article explains how to replicate Deepseek RI's slow‑thinking inference using the GRPO reinforcement‑learning algorithm on the Qwen2.5‑7B model in a free Colab notebook, covering the underlying COT concept, reward‑function design, data preparation, training configuration, and observed results.
DeepSeek AI’s new open‑source model DeepSeek‑R1 leverages a novel Group‑Related Policy Optimization (GRPO) reinforcement‑learning framework and multi‑stage training to dramatically boost complex reasoning performance, achieving AIME 2024 Pass@1 scores comparable to OpenAI’s o1 model.