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I cant find the scalar variable from one def to implement it on summrywriter and checkpoint for tensorboard here is the def that calculate mAP and IoU :

def evaluate(model, data_loader, device):
     n_threads = torch.get_num_threads()
     # FIXME remove this and make paste_masks_in_image run on the GPU
     torch.set_num_threads(1)
     cpu_device = torch.device("cpu")
     model.eval()
     metric_logger = utils.MetricLogger(delimiter="  ")
     header = 'Test:'
 
     coco = get_coco_api_from_dataset(data_loader.dataset)
     iou_types = _get_iou_types(model)
     coco_evaluator = CocoEvaluator(coco, iou_types)
 
     for images, targets in metric_logger.log_every(data_loader, 100, header):
         images = list(img.to(device) for img in images)
 
         if torch.cuda.is_available():
             torch.cuda.synchronize()
         model_time = time.time()
         outputs = model(images)
 
         outputs = [{k: v.to(cpu_device) for k, v in t.items()} for t in outputs]
         model_time = time.time() - model_time
 
         res = {target["image_id"].item(): output for target, output in zip(targets, outputs)}
         evaluator_time = time.time()
         coco_evaluator.update(res)
         evaluator_time = time.time() - evaluator_time
         metric_logger.update(model_time=model_time, evaluator_time=evaluator_time)
 
     # gather the stats from all processes
     metric_logger.synchronize_between_processes()
     print("Averaged stats:", metric_logger)
     coco_evaluator.synchronize_between_processes()
 
     # accumulate predictions from all images
     coco_evaluator.accumulate()
     coco_evaluator.summarize()
     torch.set_num_threads(n_threads)
     return coco_evaluator
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