Multi-processing with IterableDataset Warning

[ozen]

Hello. The warning message given when using an IterableDataset that has __len__ defined got me confused.

https://github.com/PyTorchLightning/pytorch-lightning/blob/049006a59cf62d3539aaf19037aca1caac98abfd/pytorch_lightning/utilities/data.py#L40-L45

Is the part e.g. batch size > 1 should be e.g. num_workers > 1 or am I missing something?

Is this warning about what IterableDataset doc explains about configuring the workers? If I write my IterableDataset similarly to the example provided in the doc and also define a __len__ function, will there be any problems due to using PL?

Thanks.

[awaelchli]

It was fixed in #6972, the message should be clearer now.
A longer explanation from pytorch can be found here.