message: Clarify how the strings 'accuracy', 'acc', 'crossentropy', 'ce' are interpreted in the compile API doc.
diff: @@ -242,6 +242,12 @@ class Model(network.Network, version_utils.VersionSelector):
  You can also pass a list (len = len(outputs)) of lists of metrics
  such as `metrics=[['accuracy'], ['accuracy', 'mse']]` or
  `metrics=['accuracy', ['accuracy', 'mse']]`.
  + When you pass the strings 'accuracy' or 'acc', we convert this to
  + one of `tf.keras.metrics.BinaryAccuracy`,
  + `tf.keras.metrics.CategoricalAccuracy`,
  + `tf.keras.metrics.SparseCategoricalAccuracy` based on the loss
  + function used and the model output shape. We do a similar conversion
  + for the strings 'crossentropy' and 'ce' as well.
  loss_weights: Optional list or dictionary specifying scalar
  coefficients (Python floats) to weight the loss contributions
  of different model outputs.
  