How should Exponential Moving Average be used in custom TF2.4 training loop

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I have a custom training loop that can be simplified as follow

inputs = tf.keras.Input(dtype=tf.float32, shape=(None, None, 3))
model = tf.keras.Model({"inputs": inputs}, {"loss": f(inputs)})
optimizer = tf.keras.optimizers.SGD(learning_rate=0.1, momentum=0.9, nesterov=True)

for inputs in batches:
    with tf.GradientTape() as tape:
        results = model(inputs, training=True)
    grads = tape.gradient(results["loss"], model.trainable_weights)
    optimizer.apply_gradients(zip(grads, model.trainable_weights))

The TensorFlow documentation of ExponentialMovingAverage is not clear on how it should be used in from-scratch training loop. As anyone worked with this?

Additionally, how should the shadow variable be restored into the model if both are still in memory, and how can I check that that training variables were correctly updated?



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