Question about xcorr

[songtianhui]

Hi, I am looking at the correlation operation, which in the file xcorr.py.
I'm confused about the function xcorr_fast and xcorr_depthwise, that using F.con2d with group to speed up. The operation may indroduce some problems.
In detail, before each F.conv2d(), px will be reshaped to size of (1, batch * channel, w, h), pk is (batch, channel, w, h). Referring to the implemention of conv2d, for each channel of output, the result is the sum of the convolution of one kernel(channel, w, h) and all layers of the x which is totally batch * channel layers.
That's to say, for each batch of the output, it integrate the information of all other batches where I think every batch is independent.
Does this operation make sense?
Thank you!