AttributeError: 'DetectionModel' object has no attribute 'yaml'

This error occurs when you try to access a `yaml` attribute on an object of class `DetectionModel`, but that attribute does not exist for that class.

There are a few possible reasons why this might happen:

1. The `yaml` attribute has not been defined in the `DetectionModel` class. In this case, you may need to define the `yaml` attribute or use a different attribute that serves the same purpose.

2. The `DetectionModel` object you are trying to access the `yaml` attribute on is not properly initialized. Check that you have initialized the object correctly and that all necessary attributes have been set.

3. You may be using an outdated or incorrect version of the `DetectionModel` class. Check the documentation for the class to ensure that you are using the correct version and that you are using it correctly.

To resolve this error, you will need to identify the cause of the issue and make the necessary changes to your code.