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Transformer Architecture (Simplified)
Last Updated: March 14, 2026
Ashish Pratap Singh
18 min read
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Before Transformers: The Bottleneck Problem
The Attention Mechanism
Self-Attention Step by Step
Multi-Head Attention: Multiple Perspectives
The Full Transformer Block
Positional Encoding: Teaching Word Order
Encoder vs. Decoder vs. Encoder-Decoder
Why Context Windows Have Limits
Putting It All Together: End-to-End Flow
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