def METHOD_NAME(keypoints_all,
                   annotated_all,
                   imgs_all,
                   keypoints_info,
                   skeleton_info,
                   dataset,
                   img_root,
                   save_path,
                   start_img_id=0,
                   start_ann_id=0):
    """Save annotations in coco-format.
    :param keypoints_all: keypoint annotations.
    :param annotated_all: images annotated or not.
    :param imgs_all: the array of images.
    :param keypoints_info: information about keypoint name.
    :param skeleton_info: information about skeleton connection.
    :param dataset: information about dataset name.
    :param img_root: the path to save images.
    :param save_path: the path to save transformed annotation file.
    :param start_img_id: the starting point to count the image id.
    :param start_ann_id: the starting point to count the annotation id.
    """
    images = []
    annotations = []
    img_id = start_img_id
    ann_id = start_ann_id
    num_annotations, keypoints_num, _ = keypoints_all.shape
    for i in range(num_annotations):
        img = imgs_all[i]
        keypoints = np.concatenate(
            [keypoints_all[i], annotated_all[i][:, None] * 2], axis=1)
        min_x, min_y = np.min(keypoints[keypoints[:, 2] > 0, :2], axis=0)
        max_x, max_y = np.max(keypoints[keypoints[:, 2] > 0, :2], axis=0)
        anno = {}
        anno['keypoints'] = keypoints.reshape(-1).tolist()
        anno['image_id'] = img_id
        anno['id'] = ann_id
        anno['num_keypoints'] = int(sum(keypoints[:, 2] > 0))
        anno['bbox'] = [
            float(min_x),
            float(min_y),
            float(max_x - min_x + 1),
            float(max_y - min_y + 1)
        ]
        anno['iscrowd'] = 0
        anno['area'] = anno['bbox'][2] * anno['bbox'][3]
        anno['category_id'] = 1
        annotations.append(anno)
        ann_id += 1
        image = {}
        image['id'] = img_id
        image['file_name'] = f'{img_id}.jpg'
        image['height'] = img.shape[0]
        image['width'] = img.shape[1]
        images.append(image)
        img_id += 1
        cv2.imwrite(os.path.join(img_root, image['file_name']), img)
    skeleton = np.concatenate(
        [np.arange(keypoints_num)[:, None], skeleton_info[:, 0][:, None]],
        axis=1) + 1
    skeleton = skeleton[skeleton.min(axis=1) > 0]
    cocotype = {}
    cocotype['info'] = {}
    cocotype['info'][
        'description'] = 'DeepPoseKit-Data Generated by MMPose Team'
    cocotype['info']['version'] = '1.0'
    cocotype['info']['year'] = time.strftime('%Y', time.localtime())
    cocotype['info']['date_created'] = time.strftime('%Y/%m/%d',
                                                     time.localtime())
    cocotype['images'] = images
    cocotype['annotations'] = annotations
    cocotype['categories'] = [{
        'supercategory': 'animal',
        'id': 1,
        'name': dataset,
        'keypoints': keypoints_info,
        'skeleton': skeleton.tolist()
    }]
    os.makedirs(os.path.dirname(save_path), exist_ok=True)
    json.dump(cocotype, open(save_path, 'w'), indent=4)
    print('number of images:', img_id)
    print('number of annotations:', ann_id)
    print(f'done {save_path}')