def cancel_instance(self, instance_id):
        return self.guest.deleteObject(id=instance_id)
Test a gradient by Finite Difference Method. Raise error on failure.
dataset/ETHPy150Open softlayer/softlayer-python/SoftLayer/managers/vs.py/VSManager.cancel_instance--crossover with--dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/gradient.py/verify_grad