Allow empty feature vectors and better define haussmann distance #56
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This might cause issues with distances that do not work with null vectors, or with vectors that are both null in some indices. The haussmann distance can handle all those cases though.
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By allowing empty feature vectors some distances might end up with a division by zero, hence they will not work. This happens for example with the canberra distance when both vectors are null in some indices.
In such a case we suggest using the haussmann distance that can correctly handle all those cases.