from torchmetrics.text import SacreBLEUScore
metric = SacreBLEUScore()
preds = ['the cat is on the mat']
target = [['there is a cat on the mat', 'a cat is on the mat']]
values = [ ]
for _ in range(10):
    values.append(metric(preds, target))
fig_, ax_ = metric.plot(values)