Receptive Field Size

Problem

Compute the receptive field size of a stack of convolution layers.

Start with rf = 1 and jump = 1, then for each (kernel, stride) pair do rf += (kernel - 1) * jump and jump *= stride. The two input lists have equal length.

Hint

Each layer extends the field by (k - 1) times the current jump.

Test cases

case 1

in: [[3],[1]]

expected: 3

case 2

in: [[3,3],[1,1]]

expected: 5

case 3

in: [[3,3,3],[2,2,2]]

expected: 15

case 4

in: [[5,3],[2,1]]

expected: 9

Starter codePython

def receptive_field(kernels, strides):
    # Your code here
    pass

4 test cases · run your code against them in the editor