why embedding.size() is [2,128]?

[wddwzwhhxx]

Hello,thanks for your contribution，but how to do the embedding? The formula you describe in the paper is Lpull = 1/ 􏰅N( 􏰆(etk −ek)2 +(ebk −ek)2􏰇),I want to know the etk.size(). I print the tag0.size() ,it is [2,128],this makes me confused ...... can you help me ?

[wddwzwhhxx]

batch_size=2