Is Neural Network a combination of multiple linear functions?

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

I want to know is Neural Network a linear model or non linear?

What I think about NN is that It uses linear function to calculate the parameters and used non linear activation function to get the values between certain range.

2

At every layer of neural network, we are using two functions in sequence: first a linear function followed by the non-linear activation function. In mathematics, that is called “composition” of two functions. Since the second function is non-linear, that means the composition of the two functions is non-linear. Then when we have multiple layers, we are composing those functions: the composition of non-linear functions is also non-linear.

1 Like