Features for forward() in SPARTA_H

[grannycola]

Hi, I have a question regarding the forward() method in SPARTA_H:

def forward(self, src, tgt):
    CTD_output = self.CTD(src, src)
    FTD_output = self.FTD(src, tgt)
    return CTD_output, FTD_output

What exactly do src and tgt represent in this context?

From what I understand, src refers to the current pose sequence. If we are working with a large temporal window, say of size 48, does src correspond to the first 24 frames or the last 24 frames?
Additionally, I noticed that in the current implementation, both inputs to CTD are src. Wouldn't it make more sense to use tgt instead, like this?

def forward(self, src, tgt):
    CTD_output = self.CTD(tgt, tgt)
    FTD_output = self.FTD(src, tgt)
    return CTD_output, FTD_output

Is the current implementation intentional, or is this a potential mistake?
Thanks in advance for your clarification!