diff --git a/src/Nncase.Importer/Onnx/MatMul.cs b/src/Nncase.Importer/Onnx/MatMul.cs
index 5c45cb855..9a0491d7a 100644
--- a/src/Nncase.Importer/Onnx/MatMul.cs
+++ b/src/Nncase.Importer/Onnx/MatMul.cs
@@ -21,13 +21,35 @@ private Expr VisitMatMul(in NodeProto op)
                 var b_a = F.Tensors.Slice(a, new int[] { 813 }, new int[] { 814 }, new int[] { 2 }, new int[] { 1 });
                 var c_a = F.Tensors.Slice(a, new int[] { 814 }, new int[] { -1 }, new int[] { 2 }, new int[] { 1 });
 
+                a_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_a" };
+                b_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_b" };
+                c_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_c" };
+
                 var a_b = F.Tensors.Slice(b, new int[] { 0 }, new int[] { 813 }, new int[] { 0 }, new int[] { 1 });
                 var b_b = F.Tensors.Slice(b, new int[] { 813 }, new int[] { 814 }, new int[] { 0 }, new int[] { 1 });
                 var c_b = F.Tensors.Slice(b, new int[] { 814 }, new int[] { -1 }, new int[] { 0 }, new int[] { 1 });
+
+                a_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_a" };
+                b_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_b" };
+                c_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_c" };
+
                 var new_a = F.Math.MatMul(a_a, a_b);
                 var new_b = F.Math.MatMul(b_a, b_b);
                 var new_c = F.Math.MatMul(c_a, c_b);
-                return F.Math.Add(new_a, F.Math.Add(new_c, new_b));
+
+                List<string> outputNames_a = new() { op.Output[0] + "_a" };
+                List<string> outputNames_b = new() { op.Output[0] + "_b" };
+                List<string> outputNames_c = new() { op.Output[0] + "_c" };
+                new_a.Metadata.OutputNames = outputNames_a;
+                new_b.Metadata.OutputNames = outputNames_b;
+                new_c.Metadata.OutputNames = outputNames_c;
+
+                var add_0 = F.Math.Add(new_c, new_b);
+                add_0.Metadata.OutputNames = new[] { op.Output[0] + "add_0" };
+                var add_1 = F.Math.Add(new_a, add_0);
+                add_1.Metadata.OutputNames = new[] { op.Output[0] + "add_1" };
+
+                return add_1;
             }
             else if (a.Metadata.OutputNames![0] == "/mlp_3/Mul_output_0")
             {
@@ -37,19 +59,51 @@ private Expr VisitMatMul(in NodeProto op)
                 var d_a = F.Tensors.Slice(a, new int[] { 3016 }, new int[] { 3017 }, new int[] { 2 }, new int[] { 1 });
                 var e_a = F.Tensors.Slice(a, new int[] { 3017 }, new int[] { -1 }, new int[] { 2 }, new int[] { 1 });
 
+                a_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_a" };
+                b_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_b" };
+                c_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_c" };
+                d_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_d" };
+                e_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_e" };
+
                 var a_b = F.Tensors.Slice(b, new int[] { 0 }, new int[] { 2247 }, new int[] { 0 }, new int[] { 1 });
                 var b_b = F.Tensors.Slice(b, new int[] { 2247 }, new int[] { 2248 }, new int[] { 0 }, new int[] { 1 });
                 var c_b = F.Tensors.Slice(b, new int[] { 2248 }, new int[] { 3016 }, new int[] { 0 }, new int[] { 1 });
                 var d_b = F.Tensors.Slice(b, new int[] { 3016 }, new int[] { 3017 }, new int[] { 0 }, new int[] { 1 });
                 var e_b = F.Tensors.Slice(b, new int[] { 3017 }, new int[] { -1 }, new int[] { 0 }, new int[] { 1 });
 
+                a_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_a" };
+                b_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_b" };
+                c_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_c" };
+                d_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_d" };
+                e_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_e" };
+
                 var new_a = F.Math.MatMul(a_a, a_b);
                 var new_b = F.Math.MatMul(b_a, b_b);
                 var new_c = F.Math.MatMul(c_a, c_b);
                 var new_d = F.Math.MatMul(d_a, d_b);
                 var new_e = F.Math.MatMul(e_a, e_b);
 
-                return F.Math.Add(new_a, F.Math.Add(F.Math.Add(F.Math.Add(new_d, new_e), new_c), new_b));
+                List<string> outputNames_a = new() { op.Output[0] + "_a" };
+                List<string> outputNames_b = new() { op.Output[0] + "_b" };
+                List<string> outputNames_c = new() { op.Output[0] + "_c" };
+                List<string> outputNames_d = new() { op.Output[0] + "_d" };
+                List<string> outputNames_e = new() { op.Output[0] + "_e" };
+                new_a.Metadata.OutputNames = outputNames_a;
+                new_b.Metadata.OutputNames = outputNames_b;
+                new_c.Metadata.OutputNames = outputNames_c;
+                new_d.Metadata.OutputNames = outputNames_d;
+                new_e.Metadata.OutputNames = outputNames_e;
+
+                var add_0 = F.Math.Add(new_d, new_e);
+                add_0.Metadata.OutputNames = new[] { op.Output[0] + "_add_0" };
+                var add_1 = F.Math.Add(add_0, new_c);
+                add_1.Metadata.OutputNames = new[] { op.Output[0] + "_add_1" };
+                var add_2 = F.Math.Add(add_1, new_b);
+                add_2.Metadata.OutputNames = new[] { op.Output[0] + "_add_2" };
+                var add_3 = F.Math.Add(add_2, new_a);
+                add_3.Metadata.OutputNames = new[] { op.Output[0] + "_add_3" };
+
+                return add_3;
             }
             else if (a.Metadata.OutputNames![0] == "/mlp_21/Mul_output_0")
             {
@@ -59,19 +113,51 @@ private Expr VisitMatMul(in NodeProto op)
                 var d_a = F.Tensors.Slice(a, new int[] { 3486 }, new int[] { 3487 }, new int[] { 2 }, new int[] { 1 });
                 var e_a = F.Tensors.Slice(a, new int[] { 3487 }, new int[] { -1 }, new int[] { 2 }, new int[] { 1 });
 
+                a_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_a" };
+                b_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_b" };
+                c_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_c" };
+                d_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_d" };
+                e_a.Metadata.OutputNames = new[] { a.Metadata.OutputNames[0] + "_e" };
+
                 var a_b = F.Tensors.Slice(b, new int[] { 0 }, new int[] { 567 }, new int[] { 0 }, new int[] { 1 });
                 var b_b = F.Tensors.Slice(b, new int[] { 567 }, new int[] { 568 }, new int[] { 0 }, new int[] { 1 });
                 var c_b = F.Tensors.Slice(b, new int[] { 568 }, new int[] { 3486 }, new int[] { 0 }, new int[] { 1 });
                 var d_b = F.Tensors.Slice(b, new int[] { 3486 }, new int[] { 3487 }, new int[] { 0 }, new int[] { 1 });
                 var e_b = F.Tensors.Slice(b, new int[] { 3487 }, new int[] { -1 }, new int[] { 0 }, new int[] { 1 });
 
+                a_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_a" };
+                b_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_b" };
+                c_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_c" };
+                d_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_d" };
+                e_b.Metadata.OutputNames = new[] { b.Metadata.OutputNames[0] + "_e" };
+
                 var new_a = F.Math.MatMul(a_a, a_b);
                 var new_b = F.Math.MatMul(b_a, b_b);
                 var new_c = F.Math.MatMul(c_a, c_b);
                 var new_d = F.Math.MatMul(d_a, d_b);
                 var new_e = F.Math.MatMul(e_a, e_b);
 
-                return F.Math.Add(new_a, F.Math.Add(F.Math.Add(F.Math.Add(new_d, new_e), new_c), new_b));
+                List<string> outputNames_a = new() { op.Output[0] + "_a" };
+                List<string> outputNames_b = new() { op.Output[0] + "_b" };
+                List<string> outputNames_c = new() { op.Output[0] + "_c" };
+                List<string> outputNames_d = new() { op.Output[0] + "_d" };
+                List<string> outputNames_e = new() { op.Output[0] + "_e" };
+                new_a.Metadata.OutputNames = outputNames_a;
+                new_b.Metadata.OutputNames = outputNames_b;
+                new_c.Metadata.OutputNames = outputNames_c;
+                new_d.Metadata.OutputNames = outputNames_d;
+                new_e.Metadata.OutputNames = outputNames_e;
+
+                var add_0 = F.Math.Add(new_d, new_e);
+                add_0.Metadata.OutputNames = new[] { op.Output[0] + "_add_0" };
+                var add_1 = F.Math.Add(add_0, new_c);
+                add_1.Metadata.OutputNames = new[] { op.Output[0] + "_add_1" };
+                var add_2 = F.Math.Add(add_1, new_b);
+                add_2.Metadata.OutputNames = new[] { op.Output[0] + "_add_2" };
+                var add_3 = F.Math.Add(add_2, new_a);
+                add_3.Metadata.OutputNames = new[] { op.Output[0] + "_add_3" };
+
+                return add_3;
             }
             else
             {