fix
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@ -119,6 +119,9 @@ struct EvalMClassBase : public IEvaluator {
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utils::Check(preds.size() % info.labels.size() == 0,
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"label and prediction size not match");
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const size_t nclass = preds.size() / info.labels.size();
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utils::Check(nclass > 1,
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"mlogloss and merror are only used for multi-class classification,"\
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" use logloss for binary classification");
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const bst_omp_uint ndata = static_cast<bst_omp_uint>(info.labels.size());
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float sum = 0.0, wsum = 0.0;
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int label_error = 0;
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