FFN

MLP: Why Transformers Need the Multilayer Perceptron

In a Llama 2 70B layer the attention projections hold 151M parameters and the MLP next to them holds 704.6M — 82% of the layer, roughly 80% of the model, and most of the bytes decode streams for every token. This post builds the block the attention posts walked past: two matmuls and a gate, why the transformer collapses without it, and where the frontier is taking it.