relu activation function using lambda

Question

Hi I want to implement a lambda function in python which gives me back x if x> 1 and 0 otherhwise (relu):

so I have smth. like:

p = [-1,0,2,4,-3,1]

relu_vals = lambda x: x if x>0 else 0 

print(relu_vals(p))

It is important to note that I want to pass the value of lambda to a function

but it fails....

Answer 1

You want to use map to apply this function on every element of the list

list(map(relu_vals, p))

gives you

[0, 0, 2, 4, 0, 1]

Also it's better to define the lambda function within map if you are not planning to use it again

print(list(map(lambda x: x if x > 0 else 0, p)))