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llm-from-scratch-learning: A Practical Learning Journey to Build Large Language Models from Scratch

Code implementations and study notes based on the book 'Build a Large Language Model (From Scratch)', helping developers gain an in-depth understanding of the internal working principles of large language models

llmtransformereducationfrom-scratchdeep-learning
Published 2026-04-07 18:15Recent activity 2026-04-07 18:18Estimated read 5 min
llm-from-scratch-learning: A Practical Learning Journey to Build Large Language Models from Scratch
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Section 01

[Main Post/Introduction] llm-from-scratch-learning: A Practical Learning Project for Building Large Language Models from Scratch

This project is based on the book 'Build a Large Language Model (From Scratch)'. Through code implementations and study notes, it helps developers gain an in-depth understanding of the internal working principles of large language models and addresses the scarcity of learning resources on the underlying principles of LLMs.

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Section 02

Project Background and Significance

Large Language Models (LLMs) are a hot technology in the AI field, but most developers still feel unfamiliar with their internal mechanisms. While there are many tutorials on using LLMs, there are few resources that delve into the underlying principles. The book 'Build a Large Language Model (From Scratch)' fills this gap, and this project is a practical code repository based on the book, helping developers break through the 'black box' perception of LLMs.

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Section 03

Progressive Learning Path Design

The project organizes code according to the chapter structure of the book, starting from basic data preprocessing and gradually deepening into core components such as attention mechanisms, Transformer architecture, pre-training, and fine-tuning. This design allows beginners in deep learning to follow the code and understand the construction principles of LLMs step by step.

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Section 04

Core Content Analysis: From Data to Model Construction

The core content of the project includes: 1. Data preparation and preprocessing (text cleaning, tokenization, vocabulary construction); 2. Implementation of attention mechanisms (self-attention, multi-head attention); 3. Transformer architecture construction (encoder/decoder design, positional encoding, layer normalization); 4. Pre-training and fine-tuning practices (unsupervised pre-training on large-scale corpora, supervised fine-tuning for specific tasks).

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Section 05

Code Features and Learning Value

The project code has three main features: 1. Clear and readable (standard variable naming, detailed comments); 2. Modular structure (clear responsibilities of functional modules, low coupling, easy for experimental modifications); 3. Supporting study notes (recording the author's thoughts, problems, and solutions during practice, providing references for learners).

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Section 06

Target Audience and Application Scenarios

This project is suitable for the following groups: AI researchers who want to deeply understand LLM principles, engineers who want to build language models from scratch, students learning deep learning, and technology enthusiasts interested in the Transformer architecture. Through practice, learners can master theoretical knowledge and gain engineering experience.

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Section 07

Summary and Outlook

llm-from-scratch-learning provides an excellent practical platform for learning LLMs, helping developers truly understand the internal mechanisms of LLMs (rather than just calling APIs). This in-depth understanding is crucial for model optimization, troubleshooting, and innovative research. As LLM technology develops, mastering the underlying principles will become a core competency for AI practitioners.