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A tff.program.FederatedDataSourceIterator that prefetches data.

Inherits From: FederatedDataSourceIterator

iterator A tff.program.FederatedDataSourceIterator used to prefetch data from.
context The tff.framework.AsyncExecutionContext to prefetch data in.
total_rounds The total number of rounds.
num_rounds_to_prefetch The number of rounds to prefetch.
num_clients_to_prefetch The number of clients to prefetch per round. Must be greater than 1 and must be identical across all rounds; attempts to select any other number of clients will fail.
prefetch_threshold The threshold below which the data source starts prefetching.

ValueError If num_clients_to_prefetch is not greater than 1.

federated_type The type of the data returned by calling select.



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Returns a new selection of data from this iterator.

num_clients A number of clients to use when selecting data. Must be a positive integer and equal to num_clients_to_prefetch.

ValueError If num_clients is not a positive integer or if num_clients is not equal to num_clients_to_prefetch.