channel we have a different kernel and hence the total number of multiplications in the first phase that is depth wise convolution is M times D G square times D K square next we compute the number of multiplications in the second phase that is point wise convolution here the kernels have a shape one cross one cross M where m is the depth of the input volume and hence the number of multiplications for one instance of convolution is M this is applied to the entire output of the first phase which has a width and height