yolox: AssertionError: Caught AssertionError in DataLoader worker process 0.

yolox 训练报错如下代码块：

根据错误提示，在voc.py文件中读取图片时发生异常。
原因：yolox给的源码读取的是lpg格式的图片，而我的输入是png格式的图片，所以报错。
（也有可能是路径没有给正确，无法读取到图片数据）

AssertionError: Caught AssertionError in DataLoader worker process 0.
Original Traceback (most recent call last):File "/home/crush/ProgramFiles/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loopdata = fetcher.fetch(index)File "/home/crush/ProgramFiles/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 44, in fetchdata = [self.dataset[idx] for idx in possibly_batched_index]File "/home/crush/ProgramFiles/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>data = [self.dataset[idx] for idx in possibly_batched_index]File "/home/crush/YOLOX/yolox/data/datasets/datasets_wrapper.py", line 110, in wrapperret_val = getitem_fn(self, index)File "/home/crush/YOLOX/yolox/data/datasets/mosaicdetection.py", line 95, in __getitem__img, _labels, _, img_id = self._dataset.pull_item(index)File "/home/crush/YOLOX/yolox/data/datasets/voc.py", line 242, in pull_itemimg = self.load_resized_img(index)File "/home/crush/YOLOX/yolox/data/datasets/voc.py", line 209, in load_resized_imgimg = self.load_image(index)File "/home/crush/YOLOX/yolox/data/datasets/voc.py", line 222, in load_imageassert img is not None
AssertionError

解决：将voc.py文件的120行读取图片代码的jpg格式改为png，错误解决！

#self._imgpath = os.path.join("%s", "JPEGImages", "%s.jpg")
self._imgpath = os.path.join("%s", "JPEGImages", "%s.png")

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yolox: AssertionError: Caught AssertionError in DataLoader worker process 0.

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