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The nonlinear function applied to each layer's weighted inputs before passing the result forward. Without nonlinearity a stack of layers collapses to one linear function and cannot learn complex patterns. ReLU is the workhorse for most deep networks; GELU and SwiGLU are common in transformer blocks.
Architecture reviews and paper reading require knowing why a model uses one activation over another. The choice affects training stability and final accuracy.
The nonlinear function applied to each layer's weighted inputs before passing the result forward. Without nonlinearity a stack of layers collapses to one linear function and cannot learn complex patterns. ReLU is the workhorse for most deep networks; GELU and SwiGLU are common in transformer blocks.
Architecture reviews and paper reading require knowing why a model uses one activation over another. The choice affects training stability and final accuracy.
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
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