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Build a new dataset that only yields examples with a particular label.

This can be used for creating pathological non-iid (in label space) datasets.

dataset the base tf.data.Dataset that yields examples that are structures of string key -> tensor value pairs.
label_key the str key that holds the label for the example.
desired_label the label value to restrict the resulting dataset to.

A tf.data.Dataset that is composed of only examples that have a label matching desired_label.