Writing about grpo
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Why Does My GPU Utilization Keep Dipping?
9 min read
Reading GPU telemetry on a colocated GRPO run: periodic utilization dips, memory-access spikes, and a bottleneck story of mine that didn't survive contact with the code.
#rl , #post-training , #grpo , #vllm , #ai-assisted
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Why Is My Model Suddenly Speaking Thai?
8 min read
A debugging story about special tokens, GRPO, and the skip_special_tokens flags scattered across your RL stack. When your SFT'd model nails the format in eval, then falls apart the moment it enters the GRPO rollout.
#rl , #post-training , #grpo , #tokenizers , #ai-assisted
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Why is my GRPO Loss 0?
8 min read
When your rewards look fine, but the loss is zero. A debugging story about vLLM, tokenizers, and importance-sampling ratios.
#rl , #post-training , #grpo , #vllm , #ai-assisted