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Neural Networks

Activation Functions

Functions that introduce non-linearity into neural-network computations.

An activation function determines how a neuron responds after its weighted inputs and bias are combined. Without non-linear activation functions, a deep network would behave like a single linear transformation.

Common choices include ReLU, sigmoid, tanh, GELU and softmax. Different functions affect gradient flow, training stability and the type of output produced by the network.

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