MLX-GRPO: Train Large Language Models on Apple Silicon Like a Pro

MLX-GRPO: A Comprehensive Guide to Training Large Language Models on Apple Silicon Introduction: What Makes MLX-GRPO a Game-Changer for LLM Training? MLX-GRPO represents a significant advancement in the field of large language model training by offering a framework that runs exclusively on Apple Silicon hardware. This specialized training framework leverages Apple’s MLX framework with Metal backend optimization, implementing Group-based Relative Policy Optimization (GRPO) enhanced with chain-of-thought prompting structures. The complete pipeline encompasses dataset preparation, reward function definitions, and GRPO training—all operating within a pure MLX environment without any CUDA dependencies. This approach fundamentally changes how developers and researchers can train …