Attention

June 2024 Status Update: Removing DataPipes and DataLoader V2

We are re-focusing the torchdata repo to be an iterative enhancement of torch.utils.data.DataLoader. We do not plan on continuing development or maintaining the [DataPipes] and [DataLoaderV2] solutions, and they will be removed from the torchdata repo. We’ll also be revisiting the DataPipes references in pytorch/pytorch. In release torchdata==0.8.0 (July 2024) they will be marked as deprecated, and in 0.9.0 (Oct 2024) they will be deleted. Existing users are advised to pin to torchdata==0.8.0 or an older version until they are able to migrate away. Subsequent releases will not include DataPipes or DataLoaderV2. Please reach out if you suggestions or comments (please use this issue for feedback)

Concater

class torchdata.datapipes.map.Concater(*datapipes: MapDataPipe)

Concatenate multiple Map DataPipes (functional name: concat).

The new index of is the cumulative sum of source DataPipes. For example, if there are 2 source DataPipes both with length 5, index 0 to 4 of the resulting ConcatMapDataPipe would refer to elements of the first DataPipe, and 5 to 9 would refer to elements of the second DataPipe.

Parameters:

datapipes – Map DataPipes being concatenated

Example

>>> # xdoctest: +SKIP
>>> from torchdata.datapipes.map import SequenceWrapper
>>> dp1 = SequenceWrapper(range(3))
>>> dp2 = SequenceWrapper(range(3))
>>> concat_dp = dp1.concat(dp2)
>>> list(concat_dp)
[0, 1, 2, 0, 1, 2]