[Feat] extractor功能更新

[fangfangssj]

运行extractor的时候，可能会因为dynamo的原因（dynamo遇到了不支持的算子，模型包含复杂的控制流，模型的输出包含标量等），捕捉到的整张图被打断，分成了很多很多的子图。

第一种情况，捕捉图时被打断的地方，torch会用python来运行，断点前后都使用dynamo来跟踪，例如下面这个提取yolov8n时，这个过程中捕捉不会停止，但是计算图会被打断成很多子图（相关PR，#133 ）
第二种情况，有时捕捉GraphMoudle时，遇到torch._C._functorch.PyCapsule._vmap_increment_nesting这个函数的时候，dynamo的捕捉过程直接被打断，这时候不会有很多的子图，只会有前面捕捉的第一个（相关报错issue，#130 ）

可以使用explain = torch._dynamo.explain(model)(**state_dict)来获得计算图数量，是否被打断，打断的原因等。

在extractor的时候，log信息多次打印出successfully的时，代表着计算图被打断，拆分成了对应的子图，这时候，每次的子图都重复保存到文件中，所以运行完只保存了最后一个子图在文件里。

Testing model: yolov8n on cuda:0
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
Graph and tensors for 'yolov8n' extracted successfully to: /root/graphnet_workspace/yolov8n
[OK] yolov8n