A note on the separability index

Understand

In discriminating between objects from different classes, the more separable these classes are the less computationally expensive and complex a classifier can be used.

• One thus seeks a measure that can quickly capture this separability concept between classes whilst having an intuitive interpretation on what it is quantifying.
• A previously proposed separability measure, the separability index (SI) has been shown to intuitively capture the class separability property very well.
• This short note highlights the limitations of this measure and proposes a slight variation to it by combining it with another form of separability measure that captures a quantity not covered by the Separability Index.