出现了个错误：An error occurred: '>' not supported between instances of 'NoneType' and 'int'

[Yiyang7869]

我是初学者，运行代码时出现了个错误：An error occurred: '>' not supported between instances of 'NoneType' and 'int'
下面是运行的过程

[10/22 19:13:14 detectron2]: Command line arguments: Namespace(config_file='./configs/coco/instance-segmentation/Fast-COCO-InstanceSegmentation.yaml', dist_url='tcp://127.0.0.1:49152', eval_only=False, machine_rank=0, num_gpus=1, num_machines=1, opts=[], resume=False)
[10/22 19:13:14 detectron2]: Contents of args.config_file=./configs/coco/instance-segmentation/Fast-COCO-InstanceSegmentation.yaml:
[10/22 19:13:14 detectron2]: Full config saved to ./output/config.yaml
[10/22 19:13:20 d2.engine.defaults]: Model:
[10/22 19:13:20 fastinst.data.dataset_mappers.fastinst_instance_dataset_mapper]: [FastInstInstanceDatasetMapper] Augmentations used in training: [ResizeShortestEdge(short_edge_length=(416, 448, 480, 512, 544, 576, 608, 640), max_size=853, sample_style='choice'), RandomFlip()]
[10/22 19:13:39 d2.data.datasets.coco]: Loading datasets/coco/annotations/instances_train2017.json takes 18.91 seconds.
[10/22 19:13:40 d2.data.datasets.coco]: Loaded 118287 images in COCO format from datasets/coco/annotations/instances_train2017.json
[10/22 19:13:47 d2.data.build]: Removed 1021 images with no usable annotations. 117266 images left.
[10/22 19:13:51 d2.data.build]: Distribution of instances among all 80 categories:
[10/22 19:13:51 d2.data.build]: Using training sampler TrainingSampler
[10/22 19:13:51 d2.data.common]: Serializing the dataset using: <class 'detectron2.data.common._TorchSerializedList'>
[10/22 19:13:51 d2.data.common]: Serializing 117266 elements to byte tensors and concatenating them all ...
[10/22 19:13:54 d2.data.common]: Serialized dataset takes 451.21 MiB
/
之后报错了
An error occurred: '>' not supported between instances of 'NoneType' and 'int'

[junjiehe96]

可以提供更详细的错误信息吗

[Yiyang7869]

Traceback (most recent call last):
File "train_net.py", line 350, in
launch(
File "/root/autodl-tmp/project/detectron2/engine/launch.py", line 86, in launch
main_func(*args)
File "train_net.py", line 342, in main
trainer = Trainer(cfg)
File "/root/autodl-tmp/project/detectron2/engine/defaults.py", line 380, in init
data_loader = self.build_train_loader(cfg)
File "train_net.py", line 155, in build_train_loader
return build_detection_train_loader(cfg, mapper=mapper)
File "/root/autodl-tmp/project/detectron2/config/config.py", line 209, in wrapped
return orig_func(**explicit_args)
File "/root/autodl-tmp/project/detectron2/data/build.py", line 549, in build_detection_train_loader
return build_batch_data_loader(
File "/root/autodl-tmp/project/detectron2/data/build.py", line 339, in build_batch_data_loader
data_loader = torchdata.DataLoader(
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 183, in init
assert prefetch_factor > 0
TypeError: '>' not supported between instances of 'NoneType' and 'int'

[junjiehe96]

Traceback (most recent call last): File "train_net.py", line 350, in launch( File "/root/autodl-tmp/project/detectron2/engine/launch.py", line 86, in launch main_func(*args) File "train_net.py", line 342, in main trainer = Trainer(cfg) File "/root/autodl-tmp/project/detectron2/engine/defaults.py", line 380, in init data_loader = self.build_train_loader(cfg) File "train_net.py", line 155, in build_train_loader return build_detection_train_loader(cfg, mapper=mapper) File "/root/autodl-tmp/project/detectron2/config/config.py", line 209, in wrapped return orig_func(**explicit_args) File "/root/autodl-tmp/project/detectron2/data/build.py", line 549, in build_detection_train_loader return build_batch_data_loader( File "/root/autodl-tmp/project/detectron2/data/build.py", line 339, in build_batch_data_loader data_loader = torchdata.DataLoader( File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 183, in init assert prefetch_factor > 0 TypeError: '>' not supported between instances of 'NoneType' and 'int'

抱歉，我没有遇到过这种问题，似乎与detectron2版本有关facebookresearch/detectron2#5086 (comment) ？

[Yiyang7869]

非常感谢您的回复，再次谢谢您

[wxm000000]

您好，我也遇到了这个问题，请问您解决了吗？ @Yiyang7869

[Yiyang7869]

已经解决了，应该是prefetch_factor=None 出现了问题（build.py），我的解决方法是将 prefetch_factor 改为一个整数 (默认是 2)（detection2.data.build.py文件中）@wxm000000

[wxm000000]

好的，谢谢！直接把prefetch_factor那三行注释掉也可以！