happy llm

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Basic Information

Happy-LLM is an open, systematized tutorial repository designed to teach the principles and practical workflows of large language models (LLMs). It aims to guide learners from basic NLP concepts through Transformer architectures to building, pretraining and fine-tuning complete LLMs. The project combines theoretical explanations with hands-on code exercises and walkthroughs so readers can implement a small LLaMA2-style model, train tokenizers, run pretraining and perform supervised fine-tuning. It also introduces modern fine-tuning techniques and application topics such as Retrieval-Augmented Generation (RAG) and simple agent implementations. The materials are targeted at students, researchers and LLM enthusiasts who have basic Python and deep learning knowledge. The repository includes organized chapters, extra contributor blogs, downloadable model artifacts and a freely available PDF of the tutorial.

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Features
A structured multi-chapter curriculum covering NLP fundamentals, Transformer internals, pretraining and LLM-specific topics. Hands-on chapters show how to implement a Transformer and build a LLaMA2-style model, train tokenizers and complete the pretraining-to-finetuning pipeline. Practical coverage of industry tools is included, with sections that use PyTorch and the Transformers framework and discuss efficient fine-tuning methods such as LoRA/QLoRA. The repo provides downloadable model checkpoints hosted on ModelScope, a PDF textbook version with a watermark, an Extra-Chapter blog area for community contributions, clear learning prerequisites and contribution guidance. The content list shows chapter status and is regularly updated by a core team and contributors.
Use Cases
The repository helps learners develop both theoretical understanding and practical skills for working with LLMs. Readers gain clear explanations of attention, Transformer blocks and pretraining objectives alongside reproducible code to implement and train models. By following the guided chapters users can practice tokenizer training, pretraining a small model, applying supervised fine-tuning and experimenting with efficient fine-tuning techniques used in production. The material also outlines LLM evaluation, RAG and agent concepts so practitioners can extend models to downstream applications. Free PDF and model artifacts accelerate experimentation, and contributor guidelines plus an active community make it suitable for students and researchers who want to join open LLM development and reproduce experiments.

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