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Data eXplore : Data Science, ML, Big Data, LLMs and AI Security Data eXplore : Data Science, ML, Big Data, LLMs and AI Security @dataxplore · 583 subscribers
Post #2025 169
Dude completely implemented the architecture of GPT-OSS-20B from scratch in PyTorch. All components were written from scratch:

⁠☞ RoPE with YaRN + NTK-by-parts for context scaling
⁠☞ RMSNorm
⁠☞ SwiGLU with clamping and residual connections
⁠☞ Mixture-of-Experts (MoE)
⁠☞ Self-Attention, optimized via Grouped Query Attention (GQA)
⁠☞ Learned sinks
⁠☞ Banded (sliding window) attention
⁠☞ Support for KV caching

All of this works on a single A100 SXM (80GB). He also wrote detailed documentation with the theory of each component, as well as instructions for setup and inference.

Repository

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