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vibed/edu/.beans/edu-vqxk--write-8-a-decoder...

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# edu-vqxk
title: 'Write §8: A decoder-only LM — stacking blocks and the causal mask'
status: completed
type: task
priority: normal
created_at: 2026-03-13T22:01:58Z
updated_at: 2026-03-16T02:30:26Z
parent: edu-u2w7
---
Explain how N transformer blocks are stacked. Causal mask ensures each position only attends to past tokens. Tie weights to the unembedding matrix (GPT-1 style). Final linear + softmax for logits.