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 deeplift_tensor_grad(grad):
    return_grad = complex_module_gradients[-1]
    del complex_module_gradients[-1]
    return return_grad