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Deep Neural Networks are nonlinear Activation Functions

Almost any process imaginable can be represented as a functional computation in a neural network, provided that the activation function is non-linear.


https://en.wikipedia.org/wiki/Activation_function


Non-linear functions address the problems of a linear activation function:

  1. They allow backpropagation because they have a derivative function which is related to the inputs.

  2. They allow “stacking” of multiple layers of neurons to create a deep neural network. Multiple hidden layers of neurons are needed to learn complex data sets with high levels of accuracy.


https://missinglink.ai/guides/neural-network-concepts/7-types-neural-network-activation-functions-right/

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