models/bls2017.py [122:156]:
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  def train_step(self, x):
    with tf.GradientTape() as tape:
      loss, bpp, mse = self(x, training=True)
    variables = self.trainable_variables
    gradients = tape.gradient(loss, variables)
    self.optimizer.apply_gradients(zip(gradients, variables))
    self.loss.update_state(loss)
    self.bpp.update_state(bpp)
    self.mse.update_state(mse)
    return {m.name: m.result() for m in [self.loss, self.bpp, self.mse]}

  def test_step(self, x):
    loss, bpp, mse = self(x, training=False)
    self.loss.update_state(loss)
    self.bpp.update_state(bpp)
    self.mse.update_state(mse)
    return {m.name: m.result() for m in [self.loss, self.bpp, self.mse]}

  def predict_step(self, x):
    raise NotImplementedError("Prediction API is not supported.")

  def compile(self, **kwargs):
    super().compile(
        loss=None,
        metrics=None,
        loss_weights=None,
        weighted_metrics=None,
        **kwargs,
    )
    self.loss = tf.keras.metrics.Mean(name="loss")
    self.bpp = tf.keras.metrics.Mean(name="bpp")
    self.mse = tf.keras.metrics.Mean(name="mse")

  def fit(self, *args, **kwargs):
    retval = super().fit(*args, **kwargs)
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models/ms2020.py [285:319]:
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  def train_step(self, x):
    with tf.GradientTape() as tape:
      loss, bpp, mse = self(x, training=True)
    variables = self.trainable_variables
    gradients = tape.gradient(loss, variables)
    self.optimizer.apply_gradients(zip(gradients, variables))
    self.loss.update_state(loss)
    self.bpp.update_state(bpp)
    self.mse.update_state(mse)
    return {m.name: m.result() for m in [self.loss, self.bpp, self.mse]}

  def test_step(self, x):
    loss, bpp, mse = self(x, training=False)
    self.loss.update_state(loss)
    self.bpp.update_state(bpp)
    self.mse.update_state(mse)
    return {m.name: m.result() for m in [self.loss, self.bpp, self.mse]}

  def predict_step(self, x):
    raise NotImplementedError("Prediction API is not supported.")

  def compile(self, **kwargs):
    super().compile(
        loss=None,
        metrics=None,
        loss_weights=None,
        weighted_metrics=None,
        **kwargs,
    )
    self.loss = tf.keras.metrics.Mean(name="loss")
    self.bpp = tf.keras.metrics.Mean(name="bpp")
    self.mse = tf.keras.metrics.Mean(name="mse")

  def fit(self, *args, **kwargs):
    retval = super().fit(*args, **kwargs)
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