Descriptors cannot not be created directly

1 Descriptors cannot not be created directly

        在运行诸如深度学习python等程序时，如mmdetection、mmdetection3d中的程序，会出现报错：“Descriptors cannot not be created directly”。详细报错如下：

        TypeError: Descriptors cannot not be created directly.
        If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.
        If you cannot immediately regenerate your protos, some other possible workarounds are:
         1. Downgrade the protobuf package to 3.20.x or lower.
         2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).

TypeError: Descriptors cannot not be created directly.
If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.
If you cannot immediately regenerate your protos, some other possible workarounds are:
 1. Downgrade the protobuf package to 3.20.x or lower.
 2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).

        出现这个问题的主要原因是protobuf版本不匹配。因此，按照错误提示，用pip安装对应版本的protobuf即可，如上述问题中对应的 3.20.1版本。安装命令为：

pip install protobuf==3.20.1

2 AttributeError: type object 'DialogCode' has no attribute 'Accepted'

        这个错误通常和pyQT组件版本有关，特别是在mayavi使用时会出现该错误。详细报错内容如下：

int(QtGui.QDialog.DialogCode.Accepted): OK,
AttributeError: type object 'DialogCode' has no attribute 'Accepted'

        解决方式是重新安装pyqt5，即：

pip install protobuf==pyqt5

 2 AttributeError: type object 'DialogCode' has no attribute 'Accepted'

        这个错误通常和pyQT组件版本有关，特别是在mayavi使用时会出现该错误。详细报错内容如下：

int(QtGui.QDialog.DialogCode.Accepted): OK,
AttributeError: type object 'DialogCode' has no attribute 'Accepted'

        解决方式是重新安装pyqt5，即：

pip install protobuf==pyqt5

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