def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def __init__(self):
        super().__init__('confusion_matrix.yaml')

        self._matrix = [[]]
        self._categories = []
        self._initialized = True