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Implementation of federated HyperLogLog for counting distinct items.
See https://en.wikipedia.org/wiki/HyperLogLog for additional details on this algorithm.
Functions
build_client_hyperloglog_computation(...): Builds a tff.Computation for computing client hyperloglog sketches.
build_federated_secure_max_computation(...): Builds a tff.Computation for computing max in a secure fashion.
create_federated_hyperloglog_computation(...): Creates a tff.Computation to estimate the number of distinct strings.