def residual(ctx, A, x, b, **kwargs):
        oldprec = ctx.prec
        try:
            ctx.prec *= 2
            A, x, b = ctx.matrix(A, **kwargs), ctx.matrix(x, **kwargs), ctx.matrix(b, **kwargs)
            return A*x - b
        finally:
            ctx.prec = oldprec
The reversal of :meth:`dump_object`.  This might be called with
dataset/ETHPy150Open fredrik-johansson/mpmath/mpmath/matrices/linalg.py/LinearAlgebraMethods.residual--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-flask-skeleton/lib/werkzeug/contrib/cache.py/RedisCache.load_object