Loads the intermediate state of the bootstrapping from file.

def _load(self, hdf5):
    """Loads the intermediate state of the bootstrapping from file."""
    positives = set(hdf5.get("PositiveIndices"))
    negatives = set(hdf5.get("NegativeIndices"))
    hdf5.cd("Model")
    model = bob.learn.boosting.BoostedMachine(hdf5)
    return model, positives, negatives