I am trying to use the CTC loss created by @SeanNaren. But I am not very clear how to fill the tensor for the labels. If I have two sequences of labels seq1 and seq2, they have length L1, L2. should the label tensor be [ seq1[0:L1], seq2[0:L2] ], or should it be [seq1[0], seq2[0], seq1[1], seq2[1], …]?
Also, I noticed that the labels are not zero. Does 0 by default reserved for the blank symbol?
Thanks a lot