How to save or output the feature vectors of the model, as well as the final detection results?

[aschneid42]

In order to understand and improve my model performance, I would like to be able to save the feature vectors that come out of the FPN in the model, as well as the final detection results. Is there a config parameter to do this, or an established way to do this most simply?

[aschneid42]

I see some builder.py files that use the configs to put together the different modules, like backbone, neck, roi_extractor... I can imagine making a custom neck file, that also saves a copy of the feature vectors it outputs if there's an argument indicating to do so... but I can also imagine having the output between the neck and roi_extractor specified by the full model builder, but then I suppose it would all have to be defined in the configs? Which would be the simpler solution?