Peek: An Interactive Transformer Visualization Tutorial to Make Large Model Working Principles Clear at a Glance

The Peek project trains a small Transformer model with only 825,000 parameters (based on Shakespearean text) to demonstrate the mathematical principles and computational processes behind large language models in a fully visual and interactive way. It addresses the black box dilemma in LLM understanding and provides a new transparent paradigm for deep learning education.

Large language models have permeated daily life, but most users and developers still have a superficial understanding of their internal mechanisms. Existing Transformer tutorials mostly stay at abstract formulas or simplified diagrams, lacking tools that can intuitively show internal computational processes, leading to a knowledge gap between theory and practice.

Peek was created by developer shawn14, adopting a "small-scale to understand large-scale" strategy: the model has only 825,000 parameters (compared to GPT-3's 175 billion and GPT-4's trillion-level), with an architecture identical to large models, trained on Shakespearean text to generate stylized content. Its controllable scale allows it to fully display weight matrices and every step of computation, just like using a model airplane to understand aerodynamics.

The core concept of Peek is "full transparency", showing:

• Embedding layer: Geometric relationships of vocabulary mapped to high-dimensional vector space
• Attention mechanism: Heatmaps showing attention relationships between words
• Feedforward network: Numerical changes of input vectors transformed into output probabilities
• Positional encoding: Processing method of sequence order information All weights, biases, and attention matrices are visible to users.

Peek provides rich interactive functions:

• Input custom text to observe attention patterns under different inputs
• Modify weights to view real-time impacts on outputs
• Replay training processes to observe loss function decline and weight adjustments Interventional learning helps understand the working mechanism of complex systems.

Peek fills the gap in AI education: it connects highly mathematical theoretical derivations with framework usage tutorials, demonstrating the specific implementation and effects of Transformer's mathematical operations. It is suitable for deep learning students, graduate students, and practitioners who want to deeply understand LLMs.

Peek is built based on the Next.js framework, with model inference running entirely in the browser:

• Supports offline use
• No data privacy concerns
• Fast response speed The UI uses the Geist font, with a simple design focusing on visualization display.

Peek model limitations: It can only generate simple text, with knowledge scope limited to Shakespearean text, but its design intent is educational. Through small models, one can gain intuition about large models:

• Relationship between parameter scale and representation ability
• Core reasons for the success of the Transformer architecture
• Importance of massive data for training Conclusion: Peek represents a new paradigm of transparent education, promoting the construction of an AI-literate society.