The activation function plays an important role in the neural network model learning and understanding of very complex problems. The following statement about the activation function is correct.

The activation function plays an important role in the neural network model learning and understanding of very complex problems. The following statement about the activation function is correct.
A . Activation functions are linear functions
B . Activation functions are non-linear functions
C . The activation function is partly a nonlinear function, partly a linear function
D . Most of the activation functions are nonlinear functions, and a few are linear functions

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Answer: B