A `DataLoader` with a custom `collate_fn` that batches items as required for training the model.
efficientdet_valid_dl(dataset, batch_tfms = NULL, ...)Possibly a `Dataset` object, but more generally, any `Sequence` that returns records.
Transforms to be applied at the batch level.
dataloader_kwargs: Keyword arguments that will be internally passed to a Pytorch `DataLoader`. The parameter `collate_fn` is already defined internally and cannot be passed here.
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