code: public void marshall(ClassifierMetadata classifierMetadata, ProtocolMarshaller protocolMarshaller) {
  
          if (classifierMetadata == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(classifierMetadata.getNumberOfLabels(), NUMBEROFLABELS_BINDING);
              protocolMarshaller.marshall(classifierMetadata.getNumberOfTrainedDocuments(), NUMBEROFTRAINEDDOCUMENTS_BINDING);
              protocolMarshaller.marshall(classifierMetadata.getNumberOfTestDocuments(), NUMBEROFTESTDOCUMENTS_BINDING);
              protocolMarshaller.marshall(classifierMetadata.getEvaluationMetrics(), EVALUATIONMETRICS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.