you can use this formula [(W−K+2P)/S]+1
.
- W is the input volume – in your case 128
- K is the Kernel size – in your case 5
- P is the padding – in your case 0 i believe
- S is the stride – which you have not provided.
So, we input into the formula:
Output_Shape = (128-5+0)/1+1
Output_Shape = (124,124,40)
NOTE: Stride defaults to 1 if not provided and the 40
in (124, 124, 40)
is the number of filters provided by the user.