tff.learning.build_federated_evaluation

Builds the TFF computation for federated evaluation of the given model.

tff.learning.build_federated_evaluation(
    model_fn: Union[Callable[[], tff.learning.models.VariableModel], tff.learning.models.FunctionalModel],
    broadcast_process: Optional[tff.templates.MeasuredProcess] = None,
    metrics_aggregator: Optional[_MetricsAggregator] = None,
    use_experimental_simulation_loop: bool = False
) -> tff.Computation

Used in the notebooks

Used in the tutorials
Differential Privacy in TFF

Args
model_fn	A no-arg function that returns a tff.learning.models.VariableModel, or an instance of a tff.learning.models.FunctionalModel. When passing a callable, the callable must not capture TensorFlow tensors or variables and use them. The model must be constructed entirely from scratch on each invocation, returning the same pre-constructed model each call will result in an error.
broadcast_process	A tff.templates.MeasuredProcess that broadcasts the model weights on the server to the clients. It must support the signature (input_values@SERVER -> output_values@CLIENTS) and have empty state. If set to default None, the server model is broadcast to the clients using the default tff.federated_broadcast.
metrics_aggregator	An optional function that takes in the metric finalizers (i.e., tff.learning.models.VariableModel.metric_finalizers()) and a tff.types.StructWithPythonType of the unfinalized metrics (i.e., the TFF type of tff.learning.models.VariableModel.report_local_unfinalized_metrics()), and returns a federated TFF computation of the following type signature local_unfinalized_metrics@CLIENTS -> aggregated_metrics@SERVER. If None, uses tff.learning.metrics.sum_then_finalize, which returns a federated TFF computation that sums the unfinalized metrics from CLIENTS, and then applies the corresponding metric finalizers at SERVER.
use_experimental_simulation_loop	Controls the reduce loop function for input dataset. An experimental reduce loop is used for simulation.

Returns
A federated computation (an instance of tff.Computation) that accepts model parameters and federated data, and returns the evaluation metrics.