我正在使用 pycocotools 库,并实现 DETR(用于对象检测的可变形变压器)。
我正在调试代码的一部分,该代码调用[此处][1]找到的 loadRes 函数。
我在行前和行后添加了打印语句
res = COCO()
,因为这条线
res.dataset['images'] = [img for img in self.dataset['images']]
给出错误 (AttributeError: 'NoneType' object has no attribute 'dataset'
)。
当我尝试跟踪代码并找到
res
的当前值(特别是为什么它是 None)时,我注意到我的打印语句没有出现在输出中,尽管在回溯中明显存在.
为什么会发生这种情况?
AttributeError Traceback (most recent call last)
<ipython-input-4-ff0c7180ea84> in <module>
175
--> 176 test_stats, coco_evaluator = evaluate(
177 model, criterion, postprocessors, data_loader_val, base_ds, "cuda", args["output_dir"]
178 )
~/anaconda3/lib/python3.8/site-packages/torch/autograd/grad_mode.py in decorate_context(*args, **kwargs)
25 def decorate_context(*args, **kwargs):
26 with self.clone():
---> 27 return func(*args, **kwargs)
28 return cast(F, decorate_context)
29
~/Desktop/traffic_sign_relevance-main/attention/engine.py in evaluate(model, criterion, postprocessors, data_loader, base_ds, device, output_dir)
128 res = {target['image_id'].item(): output for target, output in zip(targets, results)}
129 if coco_evaluator is not None:
--> 130 coco_evaluator.update(res)
131
132 if panoptic_evaluator is not None:
~/Desktop/traffic_sign_relevance-main/attention/datasets/coco_eval.py in update(self, predictions)
52 with open(os.devnull, 'w') as devnull:
53 with contextlib.redirect_stdout(devnull):
---> 54 coco_dt = COCO.loadRes(self.coco_gt, results) if results else COCO()
55 coco_eval = self.coco_eval[iou_type]
56
~/anaconda3/lib/python3.8/site-packages/pycocotools/coco.py in loadRes(self, resFile)
316 print("In loadRes")
317 print(type(res))
--> 318 res.dataset['images'] = [img for img in self.dataset['images']]
319
320 print('Loading and preparing results...')
AttributeError: 'NoneType' object has no attribute 'dataset' ```
[1]: https://github.com/cocodataset/cocoapi/blob/master/PythonAPI/pycocotools/coco.py
也许您的笔记本阻止在已安装的包内打印语句?
发生这种情况是因为第 52、53 行阻止了 pycocotools 打印。如果您注释掉块 52-54 并从像
这样的块中取出 coco_dt = ... 51 """
52 with open(os.devnull, 'w') as devnull:
53 with contextlib.redirect_stdout(devnull):
54 coco_dt = COCO.loadRes(self.coco_gt, results) if results else COCO()
55 """
56 coco_dt = COCO.loadRes(self.coco_gt, results) if results else COCO()
57 coco_eval = self.coco_eval[iou_type]
您的打印报表将显示在屏幕上。