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Transformer Without Magic: How Large Language Models Actually Work
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Publisher: Independently Published
Published: Feb 5 2026
Pages: 280
Weight: 0.83
Height: 0.59 Width: 6.00 Depth: 9.00
Language: English
You use ChatGPT, Claude, or Gemini every day - but do you actually understand what's happening under the hood?
The transformer is the most consequential software architecture of the decade, powering every major large language model from GPT-4 to LLaMA. Yet most explanations either drown you in linear algebra proofs or hand-wave with vague analogies about paying attention to words. Neither approach leaves you with real understanding.
Transformers Without Magic takes a different path. Starting from first principles and building layer by layer, this book walks you through the complete transformer architecture - from raw text to generated output - with clarity, precision, and zero mysticism. No prerequisites beyond curiosity and a willingness to think carefully.
What you'll learn:
- How text becomes vectors and why tokenization choices matter
- What attention actually computes and why it works so well
- How multi-head attention, feed-forward networks, residual connections, and layer normalization fit together
- What the residual stream is and why it changes how you think about deep networks
- How the output head and sampling strategies turn hidden states into readable text
- What the KV cache is and why it's critical for fast inference
- How quantization, batching, and the serving stack make LLMs practical at scale
- How training works and where the fundamental limitations lie
Each chapter builds on the last, giving you a complete mental model of the forward pass - from a single prompt entering the system to a token being generated on the other side. By the end, you won't just know the buzzwords. You'll understand the machinery.
Written by Sumeet Kumar, a technologist who has spent years working at the intersection of machine learning and production systems, this book is for engineers, technical leaders, and ambitious learners who refuse to treat AI as a black box.
If you want to stop hand-waving and start understanding, scroll up and grab your copy now.
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