Function LoadFeatureNames

catboost/libs/data/loader.cpp:265–306

    }

    TVector<TString> LoadFeatureNames(const TPathWithScheme& featureNamesPath) {
        TVector<TString> featureNames;

        if (featureNamesPath.Inited()) {
            auto reader = GetLineDataReader(featureNamesPath);
            TString line;
            for (size_t lineNumber = 0; reader->ReadLine(&line); ++lineNumber) {
                TVector<TString> tokens = StringSplitter(line).Split('\t');
                if (tokens.empty()) {
                    continue;
                }
                try {
                    CB_ENSURE(tokens.size() == 2, "expect two items, got " << tokens.size());

                    size_t featureIdx;
                    CB_ENSURE(
                        TryFromString(tokens[0], featureIdx),
                        "Wrong format: first field is not unsigned integer");

                    CB_ENSURE(
                        !tokens[1].empty(),
                        "feature name is empty");

                    if (featureIdx >= featureNames.size()) {
                        featureNames.resize(featureIdx + 1);
                    } else {
                        CB_ENSURE(
                            featureNames[featureIdx].empty(),
                            "feature index " << featureIdx << " specified multiple times");
                    }

                    featureNames[featureIdx] = tokens[1];

                } catch (std::exception& e) {
                    throw TCatBoostException() << "Feature names data from " << featureNamesPath
                        << ", line number " << lineNumber << ": " << e.what();
                }
            }
        }

        return featureNames;
    }

    static size_t GetFeatureCount(TConstArrayRef<TColumn> columns) {
        size_t featureCount = 0;