/// <summary>空間次元をチャネル次元に展開</summary>
        public static VariableNode SpaceToChannel3D(VariableNode x, int scale)
        {
            Function function =
                new Functions.Connection3D.SpaceToChannel(scale);

            VariableNode y = Apply(function, x)[0];

            return(y);
        }
        /// <summary>空間次元をチャネル次元に展開</summary>
        public static Tensor SpaceToChannel3D(Tensor x, int scale)
        {
            Function function =
                new Functions.Connection3D.SpaceToChannel(scale);

            Tensor y = new Tensor(function.OutputShapes(x.Shape)[0]);

            function.Execute(new Tensor[] { x }, new Tensor[] { y });

            return(y);
        }