obs : array
exp : (‘uniform’, ‘indep_rows’) or array, optional
Matrix of expected values of the same size as obs. If no
array is given, then for ‘uniform’ – evenly distributes all
observations. In ‘indep_rows’ case contingency table takes into
account frequencies relative across different columns, so, if
the contingency table is predictions vs targets, it would
account for dis-balance among different targets. Although
‘uniform’ is the default, for confusion matrices ‘indep_rows’ is
preferable.
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