Architecture.

Top-k routing has become a default. It shouldn't be. A look at the tradeoffs nobody's measuring and the experiments that change my mind.

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A neural network never sees a word, an image, or a sound — only a list of numbers. Starting from that one fact and a single neuron, this day-zero guide builds the whole machine: how any input becomes numbers, why weights, biases, and activations each exist, how neurons stack into layers and layers into a model, and how to compute a model's size and running cost by hand.