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Coders In Hoods

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LLMs for Engineers

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1 · Inside the transformer

1Tokens and embeddings
2Attention, step by step
3The transformer block
Exercise answers
- Answer: Build a block and verify parameter counts against real models
- Answer: Prove RoPE is relative, numerically

2 · How models are trained

4Pretraining and scaling laws
5Post-training an assistant

3 · Running models in production

6Sampling and hallucination
7Context windows, KV cache and caching
8Reasoning models and extended thinking
9Choosing and comparing models

CapstoneChoose a model for document extraction Reference implementation

Answers Lesson 3: The transformer block

Step-by-step answer

Core 60–90 min7 steps

Build a block and verify parameter counts against real models

Back to the exercise

Previous answerFind an induction head in GPT-2 Next answer Prove RoPE is relative, numerically

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