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The Elegant Gradient of Softmax-Cross-Entropy

this year hard (>1 hr) | Backpropagation Cross-Entropy Softmax Gradients

One of the most satisfying derivations in deep learning is the gradient of the combined Softmax and Cross-Entropy loss. For a multi-class classification problem with $K$ classes, given true labels...
Deconstructing Self-Attention Scores

this year hard (>1 hr) | Attention Transformers Softmax NLP

The self-attention mechanism is a core component of Transformers. Let's break down how attention scores are calculated. 1. **Query, Key, Value**: In self-attention, each input token (or its...