For questions related to the Kullback–Leibler (KL) divergence, which is a measure (that is not a metric, but it is pre-metric, because it does not satisfy all properties of metrics, i.e. it is not symmetric) of divergence (or distance) between two probability measures (density functions, or mass functions), which is commonly used in many machine learning settings, e.g. in the context of variational auto-encoders (VAES).

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