麻烦问下这里是什么意思，谢谢！

[alwayslikethat]

    for i in range(BATCH_SIZE):
        s_len = seqlen_1d[i]
        mask[i, 0:s_len] = 1
    mask = torch.FloatTensor(mask).to(self.device)

[ll0ruc]

@alwayslikethat
generate sentence mask, get its final feature representation according to the actual length of sentence
refer to line 60 in model.py
xx_m = torch.mul(xx, mask.unsqueeze(2)