How to make a DataLoader shuffle per batch

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1

I know that a DataLoader will shuffle per epoch, to avoid duplicate sampling.

However, I need my DataLoader to shuffle per batch, to allow duplicate sampling.

Is this possible without a Sampler?
Is this possible with a Sampler, or not possible even with a Sampler?

2

However, I need my DataLoader to shuffle per batch, to allow duplicate sampling.

I assume this means you would like to sample n times with replacement for a given batch of n size. You should be able to write your own BatchSampler to do that and pass your custom implementation to DataLoader.

Alternatively, you can write a collate_fn that re-samples and collates the batch, and pass that collate_fn to DataLoader.