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Inside a Transformer
🔴 Advanced · 6–8 min

Stacking Transformer Layers

One layer refines meaning once. Stack many, and understanding gets deeper layer by layer.

Overview

Why not just one layer?

A single transformer layer improves the tokens once. Real models stack many layers, each one refining the meaning a little more before passing it on. Let's watch that happen.

Playground

Slide to add more layers

Move the slider and watch the sentence pass through more transformer layers. Each new layer adds a little more understanding.

"The cat chased the mouse because it was hungry."
Layers 1 of 6
123456
Input sentence enters here
Why stack layers?

Refine again and again

One transformer layer improves the token representations once. Stacking many layers lets the model refine the meaning again and again, so deeper layers can catch more complex relationships.

Simple comparison

One layer vs many layers

One layer
Input
Basic understanding
Many layers
Input
Refined understanding
Deeper context
Better final representation
🔑
Key takeaways
  • • One layer improves the input once.
  • • Many layers refine the meaning step by step.
  • • Deeper layers can understand more complex relationships.
  • • Large language models use many stacked transformer layers.
  • • Each layer passes improved representations to the next layer.
Summary

Stacking transformer layers lets the model refine meaning step by step. Each layer improves the representation before passing it to the next layer.

Inside a Transformer section complete