Function CalcErrors

catboost/libs/train_lib/train_model.cpp:349–374

}

static void CalcErrors(
    const TTrainingDataProviders& data,
    const TMetricsData& metricsData,
    int iter,
    TLearnContext* ctx) {

    ctx->LearnProgress->MetricsAndTimeHistory.LearnMetricsHistory.emplace_back();
    if (data.GetTestSampleCount() > 0) {
        ctx->LearnProgress->MetricsAndTimeHistory.TestMetricsHistory.emplace_back();
    }

    auto calcAllMetrics = ShouldCalcAllMetrics(iter, metricsData, *ctx);
    auto calcErrorTrackerMetric = ShouldCalcErrorTrackerMetric(iter, metricsData, *ctx);

    if (ctx->Params.SystemOptions->IsMaster()) {
        CalcErrorsDistributed(data, metricsData.Metrics, calcAllMetrics, calcErrorTrackerMetric, ctx);
    } else {
        CalcErrorsLocally(
            data,
            metricsData.Metrics,
            calcAllMetrics,
            calcErrorTrackerMetric,
            /*calcNonAdditiveMetricsOnly*/ false,
            ctx);
    }
}

static void Train(
    const TTrainModelInternalOptions& internalOptions,