code: public JRecordExtractor<T, DoubleNamedSparseArray>
    extractWithSettingsDoubleNamedSparseArray(String settings) {
      return new JRecordExtractor<>(
              JavaOps.extractWithSettingsDoubleNamedSparseArray(self, settings));
    }
docs: Java wrapper for {@link FeatureSpec#extractWithSettings(String, FeatureBuilder, ClassTag).