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Update ConfusionMatrix.cs #2213

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Update ConfusionMatrix.cs #2213

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3 changes: 1 addition & 2 deletions Sources/Accord.Statistics/Analysis/Performance/ConfusionMatrix.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -183,8 +183,7 @@ public ConfusionMatrix(bool[] predicted, bool[] expected)
///
public ConfusionMatrix(int[] predicted, int[] expected)
{
int[] expectedSymbols = expected.Distinct();
if (expectedSymbols.Length != 2)
if (expected.DistinctCount() > 2)
{
throw new Exception("The vector of expected values contains more than two possible symbols. Please make sure the " +
"expected vector contains only values 0 or 1, or -1 and +1. If you have a multi-class decision problem, please " +
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