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An abstract interface for representing federated data source iterators.

This interface abstracts away the specifics of iterating over data in a data source.

Things one can do with a data source iterator:

  • Determine the type of the data supplied by this iterator by inspecting the federated_type property. The type returned must match that of the data source that returned this iterator.

  • Return a new selection of federated data from the iterator by invoking select.

Please see tff.program.FederatedDataSource for additional context and the high-level description of how to use data sources.

federated_type The type of the data returned by calling select.



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Deserializes the object from bytes.


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Returns a new selection of federated data from this iterator.

The selection contains data distributed across a cohort of logical clients. The manner in which this cohort is constructed is a function of the arguments supplied here by the caller (such as num_clients) as well as by the capabilities of the data source itself (e.g., whether it offers data selected uniformly at random, performs sampling without replacement, guarantees determinism, etc.).

num_clients Optional, the number of clients to select. Must be a positive integer, or None if unspecified.

An object of type federated_type representing the selected data, and that can be supplied as an argument to a tff.Computation. See tff.program.FederatedContext for more information about these types.


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Serializes the object to bytes.