import torch
from functools import lru_cache
from unicore.data import UnicoreDataset


class FromStrLabelDataset(UnicoreDataset):
    def __init__(self, labels):
        super().__init__()
        self.labels = labels

    @lru_cache(maxsize=16)
    def __getitem__(self, index):
        return self.labels[index]

    def __len__(self):
        return len(self.labels)

    def collater(self, samples):
        return torch.tensor(list(map(float, samples)))