title: What's the difference between capitalized and lowercase versions of Keras.losses and Keras.metrics?
body: <p>While I was constructing a simple Sequential ANN and selecting parameters for the <code>model.compile</code> method, I observed that <code>Keras.metrics</code> and <code>Keras.losses</code> contain capitalized as well as lowercase versions, for example <code>tf.keras.metrics.SparseCategoricalAccuracy</code> versus <code>tf.keras.metrics.sparse_categorical_accuracy</code>. I was wondering what the difference is between those versions and which one is more suitable to be used in <code>model.compile</code> ?</p>