import torch.utils.data
from torch.utils.data.dataloader import default_collate
from cogdl.data import Batch, Data
[docs]class DataLoader(torch.utils.data.DataLoader):
r"""Data loader which merges data objects from a
:class:`cogdl.data.dataset` to a mini-batch.
Args:
dataset (Dataset): The dataset from which to load the data.
batch_size (int, optional): How may samples per batch to load.
(default: :obj:`1`)
shuffle (bool, optional): If set to :obj:`True`, the data will be
reshuffled at every epoch (default: :obj:`True`)
"""
def __init__(self, dataset, batch_size=1, shuffle=True, **kwargs):
super(DataLoader, self).__init__(
# dataset, batch_size, shuffle, collate_fn=lambda data_list: Batch.from_data_list(data_list), **kwargs
dataset,
batch_size,
shuffle,
collate_fn=self.collate_fn,
**kwargs,
)
[docs] @staticmethod
def collate_fn(batch):
item = batch[0]
if isinstance(item, Data):
return Batch.from_data_list(batch)
elif isinstance(item, torch.Tensor):
return default_collate(batch)
elif isinstance(item, float):
return torch.tensor(batch, dtype=torch.float)
raise TypeError("DataLoader found invalid type: {}".format(type(item)))