About the correlation process

[hmf21]

Hi @sungonce, thanks for your impressive works and sharing! I notice that you use the "torch.bmm( )" as the correlation process in "compute_crossscale_correlation( )" function. However in general, the correlation process between two images is represented as the equation bellow. Using the multiplication to represent the correlation between two images seems to be uncommon. So could you please explain the reason for such design? Sincerely for your reply!