Applied Deep Learning – Class 42 | Target Contextual Embeddings (Q,KV)

Описание: In this session of Applied Deep Learning, we complete our exploration of Self-Attention by introducing and explaining Query, Key, and Value vectors — the core components that make attention work.

This lecture is theory-only, focused on intuition and understanding how self-attention actually computes meaningful representations for sequence data.

📚 In this lecture, we cover:

🔹 What Query, Key, and Value vectors are
Learn how each word in a sentence generates three distinct vectors — Query (Q), Key (K), and Value (V) — that help the model decide what to focus on.

🔹 Example with a sentence
We walk through a sentence example and show how Q, K, and V are assigned to each word.

🔹 Parallel computation using matrices
See how multiple Q, K, V vectors from an entire sentence are used together as matrices to compute attention scores in parallel — not one word at a time.

🔹 Random initialization and learning
Understand that Q, K, and V matrices start with random values, and during training:
✔ Predictions are made
✔ A loss is calculated
✔ Backpropagation updates these vectors
This learning process allows the network to refine attention patterns automatically.

🔹 Why this matters
This mechanism is what lets self-attention models generate contextualized embeddings, where each word’s representation adapts to the full sentence rather than being fixed.

📂 Notebook Link:
https://github.com/GenEd-Tech/Applied...

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