code: public Observable<ImageCreateSummary> createImagesFromFilesAsync(UUID projectId, ImageFileCreateBatch batch) {
          return createImagesFromFilesWithServiceResponseAsync(projectId, batch).map(new Func1<ServiceResponse<ImageCreateSummary>, ImageCreateSummary>() {
              @Override
              public ImageCreateSummary call(ServiceResponse<ImageCreateSummary> response) {
                  return response.body();
              }
          });
      }
docs: Add the provided batch of images to the set of training images.
  This API accepts a batch of files, and optionally tags, to create images. There is a limit of 64 images and 20 tags.
  
  @param projectId The project id
  @param batch The batch of image files to add. Limited to 64 images and 20 tags per batch
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ImageCreateSummary object