Fix process leak #1470
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Fix process leak #1470
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Possible fix for #1467.
Problem was that tqdm.auto.tqdm creates tqdm class which inherits from autonotebook AND asyncio. Asyncio has situation, where processes can be spawned uncontrollable.
Getting iter() and/or next from iterable each time spawned copy of DataLoader workers, that were not handled. They can be easelly terminated right after creation.