metrics.py

class Scopes:
    Training = "train"
    Validation = "val"
    Test = "test"

# support multiple experiment types and structures with ease
class Metrics:
    Loss = "loss"

    class ObjectDetection:
        tag_name = "det"

        MeanAveragePrecision = "mAP"

    class Classification:
        tag_name = "cls"

        Top1Accuracy = "Accuracy@1"

# if you want to do dynamic things 
# like scoped(Metrics.Loss, Scopes.Training, Metrics.ObjectDetection.tag_name)
def scoped(metric: str, *scopes):
    return "/".join(scopes) + f"/{metric}"