An app teaches language-model fundamentals through a step-by-step training UI

danshipper · x · 2026-07-22

Felix Rieseberg says he built an app that teaches the fundamentals of language models and gives users everything they need to build one themselves.

The attached screenshot shows a guided “build your model” interface with chapters on tokenization, embeddings, transformers, training data, pre-training, sampling, fine-tuning, and direct preference optimization. It also visualizes a live training run, loss curve, and checkpoints so learners can watch a small model train step by step.

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