def METHOD_NAME(self, key_prefix):
    """
    Parse the `input_keys` argument, given a certain prefix.
    If the prefix is `None`, it is ignored
    """
    ### TODO: redundant
    input_keys = self.input_keys
    if (key_prefix is not None) and (self.use_input_keys_prefix):
        input_keys = [f"{k}" for k in input_keys]
        # input_keys = [f"{key_prefix}/{k}" for k in input_keys]
    ###
    return input_keys