def decr(self, key, delta=1, version=None):
        return self.incr(key, -delta, version=version)
Find the vector that translates the whole system to the origin.
dataset/ETHPy150Open django/django/django/core/cache/backends/base.py/BaseCache.decr--crossover with--dataset/ETHPy150Open LettError/MutatorMath/Lib/mutatorMath/objects/location.py/biasFromLocations