Why two term relative mass and mass

[ANaaim]

In the following class we found two term :

class InertiaParametersTemplate:
    def __init__(
        self,
        mass: Callable = None,
        center_of_mass: Callable = None,
        inertia: Callable = None,
    ):
        """
        This is a pre-constructor for the InertiaParametersReal class. It allows to create a
        generic model by marker names

        Parameters
        ----------
        mass
            The callback function that returns the mass of the segment with respect to the full body
        center_of_mass
            The callback function that returns the position of the center of mass
            from the segment coordinate system on the main axis
        inertia
            The callback function that returns the inertia xx, yy and zz parameters of the segment
        """
        self.relative_mass = mass
        self.center_of_mass = center_of_mass
        self.inertia = inertia

==> why having the name of the attribute being relative_mass when the name of the parameter is mass ?

[Ipuch]

This is something that I have never used 😇 It's for somedays but I'm not even sure what it does anymore 🥲

Looking at what you wrote, it looks like callable, so meaning the attributes should be in function of identified length for further computation of inertia parameters I believe.

[ANaaim]

Maybe having the same name would be more coherent so :)