Linear

When the output value is proportional to the input value anywhere in the input domain, then the function is said to be a linear function. So, a linear function is just multiplying something with the input.

$f\left(x\right)=a\ast x$

1class LinearActivation():
2    def __init__(self, a):
3        self.a = a
4    
5    def forward(X):
6        return a*X