guides/functional_api.py/CustomRNN/__init__
class CustomRNN:    def __init__(self):
        super().__init__()
        self.units = units
        self.projection_1 = layers.Dense(units=units, activation="tanh")
        self.projection_2 = layers.Dense(units=units, activation="tanh")
        # Our previously-defined Functional model
        self.classifier = model