Stream Dataset API

Main entry points:

• aberrant.stream.dataset.load
• aberrant.stream.dataset.download
• aberrant.stream.dataset.list_available
• aberrant.stream.dataset.get_dataset_info
• aberrant.stream.dataset.Dataset
• aberrant.stream.dataset.DatasetStreamer
• aberrant.stream.dataset.BatchStreamer

aberrant.stream re-exports dataset APIs for convenience.