in src/run_paraphrase.py [0:0]
def collater(batch):
batch = list(batch)
x1 = collate_tokens([x[0] for x in batch], pad_idx=PAD_TOKEN)
x2 = collate_tokens([x[1] for x in batch], pad_idx=PAD_TOKEN)
len1 = torch.stack([x[2] for x in batch])
len2 = torch.stack([x[3] for x in batch])
y = torch.stack([x[4] for x in batch])
return (x1, x2, len1, len2, y)