// CHECK:      {
// CHECK-NEXT:     version: 3,
// CHECK-NEXT:     operator_codes: [ {
// CHECK-NEXT:       deprecated_builtin_code: 35,
// CHECK-NEXT:       version: 1,
// CHECK-NEXT:       builtin_code: UNIDIRECTIONAL_SEQUENCE_RNN
// CHECK-NEXT:     } ],
// CHECK-NEXT:     subgraphs: [ {
// CHECK-NEXT:       tensors: [ {
// CHECK-NEXT:         shape: [ 4 ],
// CHECK-NEXT:         buffer: 1,
// CHECK-NEXT:         name: "arg0",