Backward and forward in L-TDM module

[aikuniverse]

Hello!
nice work you guys have done!
I have a stupid question after reading paper and code carefully:
What's the meaning of Backward and forward in L-TDM module ?

[yztongzhan]

Hi @troublecmd, thanks for your question!
Forwoard in L-TDM means F_{t+1} - F_{t}, Backward in L-TDM means F_{t} - F_{t+1}