Method mustBeNone

source/python.js:12650–12654

()

                return true;
            }
            mustBeNone() {
                return this._kind === 'prim::AutogradZero' ||
                    (this.outputs().length === 1 && this.output().type() === torch.NoneType.get()) ||
                    (this._kind === 'prim::Constant' && !this.hasAttributes() && this.output().type() instanceof torch.OptionalType);
            }
            maybeSchema() {
                const op = this.maybeOperator();
                if (op) {