code: public ServiceCall<InputStream> getCoreMlModel(GetCoreMlModelOptions getCoreMlModelOptions) {
      Validator.notNull(getCoreMlModelOptions, "getCoreMlModelOptions cannot be null");
      String[] pathSegments = { "v3/classifiers", "core_ml_model" };
      String[] pathParameters = { getCoreMlModelOptions.classifierId() };
      RequestBuilder builder = RequestBuilder.get(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments,
          pathParameters));
      builder.query("version", versionDate);
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("watson_vision_combined", "v3", "getCoreMlModel");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/octet-stream");
      return createServiceCall(builder.build(), ResponseConverterUtils.getInputStream());
    }
docs: Retrieve a Core ML model of a classifier.
  
  Download a Core ML model file (.mlmodel) of a custom classifier that returns <tt>\"core_ml_enabled\": true</tt> in
  the classifier details.
  
  @param getCoreMlModelOptions the {@link GetCoreMlModelOptions} containing the options for the call
  @return a {@link ServiceCall} with a response type of {@link InputStream}