#   Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserve.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from .base_dataset import BaseDataset
from .builder import DATASETS


@DATASETS.register()
class EmptyDataset(BaseDataset):
    '''
    Dataset for models who don't need a dataset.
    '''
    def __init__(self, size=1):
        super().__init__()
        self.size = size
        self.data_infos = self.prepare_data_infos()
    
    def prepare_data_infos(self):
        return [{i: 0} for i in range(self.size)]