Is the New Model Outperforming the Current Model in Production?

The test is to say, ok, is the new model out performing the model that is in production? Because if it's not out performing it, then there's no need to change rigt. We usually have a function that loads data, right? So we actually test this function. Did it load the data the way we think it should load the data? Like a sample sat, ok? And then we have different pandas pipe lines. So we maybe are removing missing rols, or we are trying to remove a duplicate sorcer. Those are part of the whole the unit.