Question about Eq(8)

[jamiechoi1995]

My question is, in Eq(8),

v represents the spatial image features, and I think it should be time-invariant, so why it has a subscript "t"?

Thanks.

[miroblog]

Right... shouldn't it be just v_i?

[kangkang59812]

I think it just keep its form the same as αti