fairseq/fairseq/data/roll_dataset.py

# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

import torch

from . import BaseWrapperDataset


class RollDataset(BaseWrapperDataset):
    def __init__(self, dataset, shifts):
        super().__init__(dataset)
        self.shifts = shifts

    def __getitem__(self, index):
        item = self.dataset[index]
        return torch.roll(item, self.shifts)