code question

[cymqqqq]

 can U explain the following code?

& what's the meaning of -9e15 and adj? zero_vec = -9e15*torch.ones_like(e) attention = torch.where(adj > 0, e, zero_vec)

[ZifengDing]

e to the power of -inf approach zero, so e to the power of -9e15 equals zero. torch.where helps you select the value of an element between matrix e and zero_vec.

[cymqqqq]

thx

[sxudai]

why not just use 0

[ZhaochengD]

Because the number is passed to softmax and e^0=1