loss function: mean CVMAE

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from the paper

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Implemented in 5aae785

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Note the above is missing a numerator, it should be like this

... from Choler et al. 2010

corrected in 3cf205b

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latex loss function:

F = \frac{1}{N}\sum_{j=1}^{N}CVMAE_{j}

cvmae

CVMAE_{j} = \frac{\frac{1}{i}\sum_{i=1}^{n}|fCover_{i,obs} - fCover_{i,pred}|}{\overline{fCover_{obs}}}

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coefficient of determination, aka R^2, aka Nash Sutcliffe coefficient of efficiency, aka NSE

R^{2} = 1- \frac{\sum_{i=1}^{n}(fCover_{i,obs} - fCover_{i,pred})^{2}}{\sum_{i=1}^{n}(fCover_{i,obs} - \overline{fCover_{obs}})^{2}}