void ISaveAsOnnx.SaveAsOnnx(OnnxContext ctx)
        {
            Host.CheckValue(ctx, nameof(ctx));
            Host.Assert(Bindable is IBindableCanSaveOnnx);
            var onnxBindable = (IBindableCanSaveOnnx)Bindable;

            var schema = _bindings.RowMapper.InputRoleMappedSchema;

            Host.Assert(_bindings.DerivedColumnCount == 0);
            string[] outVariableNames = new string[_bindings.InfoCount];
            for (int iinfo = 0; iinfo < _bindings.InfoCount; ++iinfo)
            {
                int    colIndex = _bindings.MapIinfoToCol(iinfo);
                string colName  = _bindings.GetColumnName(colIndex);
                colName = ctx.AddIntermediateVariable(_bindings.GetColumnType(colIndex), colName);
                outVariableNames[iinfo] = colName;
            }

            if (!onnxBindable.SaveAsOnnx(ctx, schema, outVariableNames))
            {
                foreach (var name in outVariableNames)
                {
                    ctx.RemoveVariable(name, true);
                }
            }
        }