smape computes the symmetric mean absolute percentage error between
two numeric vectors.
The ground truth numeric vector.
The predicted numeric vector, where each element in the vector
is a prediction for the corresponding element in
smape is defined as two times the average of
abs(actual - predicted) / (abs(actual) + abs(predicted)).
Therefore, at the elementwise level, it will provide
NaN only if
are both zero. It has an upper bound of
2, when either
predicted are zero or when
predicted are opposite
smape is symmetric in the sense that
smape(x, y) = smape(y, x).
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