/// <summary>複素純実数</summary>
        public static Tensor ComplexPureReal(Tensor real)
        {
            Function function = new Functions.Complex.ComplexPureReal();

            Shape y_shape = function.OutputShapes(real.Shape)[0];

            Tensor y = new Tensor(y_shape);

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

            return(y);
        }
        /// <summary>複素純実数</summary>
        public static VariableNode ComplexPureReal(VariableNode real)
        {
            Function function = new Functions.Complex.ComplexPureReal();

            return(Apply(function, real)[0]);
        }