使用python3 pth2onnx.py命令自动下载EfficientNetV2权重文件时报错Failed to load image Python extension，但实际上权重文件已正常下载

一、问题现象（附报错日志上下文）：
使用python3 pth2onnx.py命令自动下载EfficientNetV2权重文件时报错：
(EfficientNetV2) [root@localhost EfficientNetV2_for_Pytorch]# python3 pth2onnx.py                                          /root/anaconda3/envs/EfficientNetV2/lib/python3.7/site-packages/torchvision/io/image.py:13: UserWarning: Failed to load image Python extension:
  warn(f"Failed to load image Python extension: {e}")
Downloading: "https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-weights/efficientnetv2_t_agc-3620981a.pth" to /root/.cache/torch/hub/checkpoints/efficientnetv2_t_agc-3620981a.pth

检查权重文件，实际上已正常下载：
(EfficientNetV2) [root@localhost EfficientNetV2_for_Pytorch]# ll /root/.cache/torch/hub/checkpoints/efficientnetv2_t_agc-3620981a.pth
-rw------- 1 root root 55190269 Jun 19 11:05 /root/.cache/torch/hub/checkpoints/efficientnetv2_t_agc-3620981a.pth
(EfficientNetV2) [root@localhost EfficientNetV2_for_Pytorch]# ls -lh  /root/.cache/torch/hub/checkpoints/efficientnetv2_t_agc-3620981a.pth
-rw------- 1 root root 53M Jun 19 11:05 /root/.cache/torch/hub/checkpoints/efficientnetv2_t_agc-3620981a.pth

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