It’s Day 8 of Building LLMs from Scratch:
Implemented self-attention, the core mechanism behind transformers and GPT models! This involves computing attention scores using scaled dot-product attention:
1. Project inputs into Query (Q), Key (K), and Value (V) matrices
2. Compute attention scores using Q · Kᵀ / sqrt(d_k)
3. Apply softmax to get attention weights
4. Multiply with V to get the weighted output
This lets the model focus on relevant parts of the input—like how each word relates to others in a sentence!
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