def no_decay(init, _final, _total_steps, _step):
    """
    Return the init value, regardless of all others.

    Parameters
    ----------
    init: float
        First value.
    _final: Any
        Unused value.
    _total_steps: Any
        Unused value.
    _step: Any
        Unused value.

    Returns
    -------
    init: float
        Value entered in the `init` parameter.

    Notes
    -----
    Useful when it is needed a function that accepts four parameters as all others
    decay functions, but it is no needed to compute any decay.

    """
    return init