Not able to understand, this specific part of the code about lm-lstm-crf

[airship-explorer]

buckets[idx][1].append([label[ind] * label_size + label[ind + 1] for ind in range(0, cur_len)] + [
            label[cur_len] * label_size + pad_label] + [pad_label * label_size + pad_label] * (
                                   thresholds[idx] - cur_len_1))

there is a part of the code where targets are formed using the above function in construct_bucket_vb

what is it happening in this part of code?

You can read the code part crit.forward(scores, tg_v, mask_v) . The author preprocess the tags for easily calculating the score of golden sentence which is part of total loss. (Main idea: transform the 2-d index into 1-d.)