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Returns a small synthetic dataset for testing.

Each client produced has exactly 10 examples, one label for each digit. The images are derived from a fixed set of hard-coded images, and transformed using tff.simulation.datasets.emnist.get_infinite to produce the desired number of clients.

num_clients The number of synthetic clients to generate.

A tff.simulation.ClientData object that matches the characteristics (other than size) of those provided by tff.simulation.datasets.emnist.load_data.