From 10ff91a6dc59c2498668c553ca7f1f2dd264271d Mon Sep 17 00:00:00 2001
From: Meghna Natraj <mnatraj@google.com>
Date: Mon, 8 Jun 2020 13:09:27 -0700
Subject: [PATCH] Update test case for modify model interface. The input and
 output float tensors are in the beginning and end of the model respectively.

PiperOrigin-RevId: 315337239
Change-Id: I9f0efe0b3abfa82214fc9ac5ce35b4c340b7e24d
---
 .../optimize/modify_model_interface_test.cc   | 390 +++++++++---------
 1 file changed, 196 insertions(+), 194 deletions(-)

diff --git a/tensorflow/lite/tools/optimize/modify_model_interface_test.cc b/tensorflow/lite/tools/optimize/modify_model_interface_test.cc
index 5a04f28f638..9e4808127bb 100644
--- a/tensorflow/lite/tools/optimize/modify_model_interface_test.cc
+++ b/tensorflow/lite/tools/optimize/modify_model_interface_test.cc
@@ -26,10 +26,8 @@ namespace tflite {
 namespace optimize {
 namespace {
 
-using ::testing::ElementsAreArray;
-
-// Create a model with 1 quant, 1 FC, 1 dequant
-std::unique_ptr<ModelT> CreateModelSingleInputOutput() {
+// Create a quantized model with 1 quant, 1 FC, 1 dequant
+std::unique_ptr<ModelT> CreateQuantizedModelSingleInputOutput() {
   auto model = absl::make_unique<ModelT>();
   auto subgraph = absl::make_unique<tflite::SubGraphT>();
   auto buffer = absl::make_unique<tflite::BufferT>();
@@ -54,15 +52,15 @@ std::unique_ptr<ModelT> CreateModelSingleInputOutput() {
 
   // Op.
   quant_op->opcode_index = 0;
-  quant_op->inputs = {2};
-  quant_op->outputs = {0};
+  quant_op->inputs = {0};
+  quant_op->outputs = {1};
 
   fc_op->opcode_index = 1;
-  fc_op->inputs = {0};
-  fc_op->outputs = {1};
+  fc_op->inputs = {1};
+  fc_op->outputs = {2};
 
   dequant_op->opcode_index = 2;
-  dequant_op->inputs = {1};
+  dequant_op->inputs = {2};
   dequant_op->outputs = {3};
 
   model->subgraphs[0]->operators.push_back(std::move(quant_op));
@@ -73,32 +71,31 @@ std::unique_ptr<ModelT> CreateModelSingleInputOutput() {
   model->operator_codes.push_back(std::move(fc_op_code));
   model->operator_codes.push_back(std::move(dequant_op_code));
 
-  // Model input/otuput.
-  model->subgraphs[0]->inputs = {2};
+  // Model input/output.
+  model->subgraphs[0]->inputs = {0};
   model->subgraphs[0]->outputs = {3};
 
-  // Tensors. Float tensors are at the end of the tensor list.
-
+  // Tensors
   auto tensor_0 = absl::make_unique<TensorT>();
-  tensor_0->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_0->quantization->scale.push_back(0.35);
-  tensor_0->quantization->zero_point.push_back(28);
   tensor_0->name = "tensor_0";
   tensor_0->shape = {};
-  tensor_0->type = TensorType_INT8;
+  tensor_0->type = TensorType_FLOAT32;
 
   auto tensor_1 = absl::make_unique<TensorT>();
   tensor_1->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_1->quantization->scale.push_back(0.12);
-  tensor_1->quantization->zero_point.push_back(50);
+  tensor_1->quantization->scale.push_back(0.35);
+  tensor_1->quantization->zero_point.push_back(28);
   tensor_1->name = "tensor_1";
   tensor_1->shape = {};
   tensor_1->type = TensorType_INT8;
 
   auto tensor_2 = absl::make_unique<TensorT>();
+  tensor_2->quantization = absl::make_unique<QuantizationParametersT>();
+  tensor_2->quantization->scale.push_back(0.12);
+  tensor_2->quantization->zero_point.push_back(50);
   tensor_2->name = "tensor_2";
   tensor_2->shape = {};
-  tensor_2->type = TensorType_FLOAT32;
+  tensor_2->type = TensorType_INT8;
 
   auto tensor_3 = absl::make_unique<TensorT>();
   tensor_3->name = "tensor_3";
@@ -116,9 +113,8 @@ std::unique_ptr<ModelT> CreateModelSingleInputOutput() {
   return model;
 }
 
-// Create a model with 2 quant, 1 FC, 2 dequant
-// The model mimics the behavior of the quantize_model.cc.
-std::unique_ptr<ModelT> CreateModelMultipleInputOutput() {
+// Create a quantized model with 2 quant, 1 FC, 2 dequant
+std::unique_ptr<ModelT> CreateQuantizedModelMultipleInputOutput() {
   auto model = absl::make_unique<ModelT>();
   auto subgraph = absl::make_unique<tflite::SubGraphT>();
   auto buffer = absl::make_unique<tflite::BufferT>();
@@ -145,21 +141,21 @@ std::unique_ptr<ModelT> CreateModelMultipleInputOutput() {
 
   // Op.
   quant_op_1->opcode_index = 0;
-  quant_op_1->inputs = {4};
-  quant_op_1->outputs = {0};
+  quant_op_1->inputs = {0};
+  quant_op_1->outputs = {2};
   quant_op_2->opcode_index = 0;
-  quant_op_2->inputs = {5};
-  quant_op_2->outputs = {1};
+  quant_op_2->inputs = {1};
+  quant_op_2->outputs = {3};
 
   fc_op->opcode_index = 1;
-  fc_op->inputs = {0, 1};
-  fc_op->outputs = {2, 3};
+  fc_op->inputs = {2, 3};
+  fc_op->outputs = {4, 5};
 
   dequant_op_1->opcode_index = 2;
-  dequant_op_1->inputs = {2};
+  dequant_op_1->inputs = {4};
   dequant_op_1->outputs = {6};
   dequant_op_2->opcode_index = 2;
-  dequant_op_2->inputs = {3};
+  dequant_op_2->inputs = {5};
   dequant_op_2->outputs = {7};
 
   model->subgraphs[0]->operators.push_back(std::move(quant_op_1));
@@ -172,30 +168,24 @@ std::unique_ptr<ModelT> CreateModelMultipleInputOutput() {
   model->operator_codes.push_back(std::move(fc_op_code));
   model->operator_codes.push_back(std::move(dequant_op_code));
 
-  // Model input/otuput.
-  model->subgraphs[0]->inputs = {4, 5};
+  // Model input/output.
+  model->subgraphs[0]->inputs = {0, 1};
   model->subgraphs[0]->outputs = {6, 7};
 
   // Tensors
   auto tensor_0 = absl::make_unique<TensorT>();
-  tensor_0->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_0->quantization->scale.push_back(0.35);
-  tensor_0->quantization->zero_point.push_back(28);
   tensor_0->name = "tensor_0";
   tensor_0->shape = {};
-  tensor_0->type = TensorType_INT8;
+  tensor_0->type = TensorType_FLOAT32;
 
   auto tensor_1 = absl::make_unique<TensorT>();
-  tensor_1->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_1->quantization->scale.push_back(0.12);
-  tensor_1->quantization->zero_point.push_back(50);
   tensor_1->name = "tensor_1";
   tensor_1->shape = {};
-  tensor_1->type = TensorType_INT8;
+  tensor_1->type = TensorType_FLOAT32;
 
   auto tensor_2 = absl::make_unique<TensorT>();
   tensor_2->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_2->quantization->scale.push_back(0.45);
+  tensor_2->quantization->scale.push_back(0.35);
   tensor_2->quantization->zero_point.push_back(28);
   tensor_2->name = "tensor_2";
   tensor_2->shape = {};
@@ -203,21 +193,27 @@ std::unique_ptr<ModelT> CreateModelMultipleInputOutput() {
 
   auto tensor_3 = absl::make_unique<TensorT>();
   tensor_3->quantization = absl::make_unique<QuantizationParametersT>();
-  tensor_3->quantization->scale.push_back(0.22);
+  tensor_3->quantization->scale.push_back(0.12);
   tensor_3->quantization->zero_point.push_back(50);
   tensor_3->name = "tensor_3";
   tensor_3->shape = {};
   tensor_3->type = TensorType_INT8;
 
   auto tensor_4 = absl::make_unique<TensorT>();
+  tensor_4->quantization = absl::make_unique<QuantizationParametersT>();
+  tensor_4->quantization->scale.push_back(0.45);
+  tensor_4->quantization->zero_point.push_back(28);
   tensor_4->name = "tensor_4";
   tensor_4->shape = {};
-  tensor_4->type = TensorType_FLOAT32;
+  tensor_4->type = TensorType_INT8;
 
   auto tensor_5 = absl::make_unique<TensorT>();
+  tensor_5->quantization = absl::make_unique<QuantizationParametersT>();
+  tensor_5->quantization->scale.push_back(0.22);
+  tensor_5->quantization->zero_point.push_back(50);
   tensor_5->name = "tensor_5";
   tensor_5->shape = {};
-  tensor_5->type = TensorType_FLOAT32;
+  tensor_5->type = TensorType_INT8;
 
   auto tensor_6 = absl::make_unique<TensorT>();
   tensor_6->name = "tensor_6";
@@ -266,7 +262,7 @@ std::unique_ptr<ModelT> CreateFloatModel() {
   model->subgraphs[0]->operators.push_back(std::move(fc_op));
   model->operator_codes.push_back(std::move(fc_op_code));
 
-  // Model input/otuput.
+  // Model input/output.
   model->subgraphs[0]->inputs = {0};
   model->subgraphs[0]->outputs = {1};
 
@@ -291,12 +287,7 @@ std::unique_ptr<ModelT> CreateFloatModel() {
 }
 
 TEST(ModelInterface, Uint8SingleInputOutput) {
-  auto model = CreateModelSingleInputOutput();
-
-  // Ops.
-  EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 0);
-  EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 1);
-  EXPECT_EQ(model->subgraphs[0]->operators[2]->opcode_index, 2);
+  auto model = CreateQuantizedModelSingleInputOutput();
 
   // Change model type.
   flatbuffers::FlatBufferBuilder builder;
@@ -305,32 +296,35 @@ TEST(ModelInterface, Uint8SingleInputOutput) {
             kTfLiteOk);
 
   // Verify results.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 3);
   EXPECT_EQ(model->subgraphs[0]->tensors.size(), 4);
-  EXPECT_EQ(model->buffers.size(), 1);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->name, "tensor_2");
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[2]->quantization->scale[0],
-                  0.35);
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->quantization->zero_point[0], 156);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->name, "tensor_3");
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[3]->quantization->scale[0],
-                  0.12);
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->quantization->zero_point[0], 178);
-
-  // Ops.
+  EXPECT_EQ(model->subgraphs[0]->inputs.size(), 1);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
+  EXPECT_EQ(model->subgraphs[0]->outputs.size(), 1);
+  EXPECT_EQ(model->subgraphs[0]->outputs[0], 3);
+  EXPECT_EQ(model->operator_codes.size(), 3);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 3);
   EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 0);
   EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 1);
   EXPECT_EQ(model->subgraphs[0]->operators[2]->opcode_index, 0);
+
+  auto input_quant_op = model->subgraphs[0]->operators[0].get();
+  auto input = model->subgraphs[0]->tensors[input_quant_op->inputs[0]].get();
+  EXPECT_EQ(input->name, "tensor_0");
+  EXPECT_EQ(input->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(input->quantization->scale[0], 0.35);
+  EXPECT_EQ(input->quantization->zero_point[0], 156);
+
+  auto output_quant_op = model->subgraphs[0]->operators[2].get();
+  auto output = model->subgraphs[0]->tensors[output_quant_op->outputs[0]].get();
+  EXPECT_EQ(output->name, "tensor_3");
+  EXPECT_EQ(output->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(output->quantization->scale[0], 0.12);
+  EXPECT_EQ(output->quantization->zero_point[0], 178);
 }
 
 TEST(ModelInterface, Int8SingleInputOutput) {
-  auto model = CreateModelSingleInputOutput();
+  auto model = CreateQuantizedModelSingleInputOutput();
 
   // Change model type.
   flatbuffers::FlatBufferBuilder builder;
@@ -339,20 +333,35 @@ TEST(ModelInterface, Int8SingleInputOutput) {
             kTfLiteOk);
 
   // Verify results.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->tensors.size(), 2);
-  EXPECT_EQ(model->buffers.size(), 1);
-
+  // TODO (b/158254056): Remove unused inputs and outputs from tensor list
+  // EXPECT_EQ(model->subgraphs[0]->tensors.size(), 2);
+  EXPECT_EQ(model->subgraphs[0]->tensors.size(), 3);
   EXPECT_EQ(model->subgraphs[0]->inputs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 1);
   EXPECT_EQ(model->subgraphs[0]->outputs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->outputs[0], 1);
+  EXPECT_EQ(model->subgraphs[0]->outputs[0], 2);
+  EXPECT_EQ(model->operator_codes.size(), 3);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 1);
+  EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 1);
+
+  auto fc_op = model->subgraphs[0]->operators[0].get();
+
+  auto input = model->subgraphs[0]->tensors[fc_op->inputs[0]].get();
+  EXPECT_EQ(input->name, "tensor_1");
+  EXPECT_EQ(input->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(input->quantization->scale[0], 0.35);
+  EXPECT_EQ(input->quantization->zero_point[0], 28);
+
+  auto output = model->subgraphs[0]->tensors[fc_op->outputs[0]].get();
+  EXPECT_EQ(output->name, "tensor_2");
+  EXPECT_EQ(output->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(output->quantization->scale[0], 0.12);
+  EXPECT_EQ(output->quantization->zero_point[0], 50);
 }
 
 TEST(ModelInterface, MixedTypeSingleInputOutput) {
-  auto model = CreateModelSingleInputOutput();
+  auto model = CreateQuantizedModelSingleInputOutput();
 
   // Change model type.
   flatbuffers::FlatBufferBuilder builder;
@@ -361,27 +370,34 @@ TEST(ModelInterface, MixedTypeSingleInputOutput) {
             kTfLiteOk);
 
   // Verify results.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 2);
   EXPECT_EQ(model->subgraphs[0]->tensors.size(), 3);
-  EXPECT_EQ(model->buffers.size(), 1);
-
   EXPECT_EQ(model->subgraphs[0]->inputs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->inputs[0], 2);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
   EXPECT_EQ(model->subgraphs[0]->outputs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->outputs[0], 1);
+  EXPECT_EQ(model->subgraphs[0]->outputs[0], 2);
+  EXPECT_EQ(model->operator_codes.size(), 3);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 2);
+  EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 0);
+  EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 1);
+
+  auto quant_op = model->subgraphs[0]->operators[0].get();
+  auto input = model->subgraphs[0]->tensors[quant_op->inputs[0]].get();
+  EXPECT_EQ(input->name, "tensor_0");
+  EXPECT_EQ(input->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(input->quantization->scale[0], 0.35);
+  EXPECT_EQ(input->quantization->zero_point[0], 156);
+
+  auto fc_op = model->subgraphs[0]->operators[1].get();
+  auto output = model->subgraphs[0]->tensors[fc_op->outputs[0]].get();
+  EXPECT_EQ(output->name, "tensor_2");
+  EXPECT_EQ(output->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(output->quantization->scale[0], 0.12);
+  EXPECT_EQ(output->quantization->zero_point[0], 50);
 }
 
 TEST(ModelInterface, Uint8MutipleInputOutput) {
-  auto model = CreateModelMultipleInputOutput();
-
-  // Ops.
-  EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 0);
-  EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 0);
-  EXPECT_EQ(model->subgraphs[0]->operators[2]->opcode_index, 1);
-  EXPECT_EQ(model->subgraphs[0]->operators[3]->opcode_index, 2);
-  EXPECT_EQ(model->subgraphs[0]->operators[4]->opcode_index, 2);
+  auto model = CreateQuantizedModelMultipleInputOutput();
 
   // Change model type.
   flatbuffers::FlatBufferBuilder builder;
@@ -390,54 +406,55 @@ TEST(ModelInterface, Uint8MutipleInputOutput) {
             kTfLiteOk);
 
   // Verify results.
-  // Model.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 5);
   EXPECT_EQ(model->subgraphs[0]->tensors.size(), 8);
   EXPECT_EQ(model->subgraphs[0]->inputs.size(), 2);
-  EXPECT_EQ(model->subgraphs[0]->inputs[0], 4);
-  EXPECT_EQ(model->subgraphs[0]->inputs[1], 5);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
+  EXPECT_EQ(model->subgraphs[0]->inputs[1], 1);
   EXPECT_EQ(model->subgraphs[0]->outputs.size(), 2);
   EXPECT_EQ(model->subgraphs[0]->outputs[0], 6);
   EXPECT_EQ(model->subgraphs[0]->outputs[1], 7);
-  EXPECT_EQ(model->buffers.size(), 1);
-
-  // Tensors,
-  EXPECT_EQ(model->subgraphs[0]->tensors[4]->name, "tensor_4");
-  EXPECT_EQ(model->subgraphs[0]->tensors[4]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[4]->quantization->scale[0],
-                  0.35);
-  EXPECT_EQ(model->subgraphs[0]->tensors[4]->quantization->zero_point[0], 156);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[5]->name, "tensor_5");
-  EXPECT_EQ(model->subgraphs[0]->tensors[5]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[5]->quantization->scale[0],
-                  0.12);
-  EXPECT_EQ(model->subgraphs[0]->tensors[5]->quantization->zero_point[0], 178);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[6]->name, "tensor_6");
-  EXPECT_EQ(model->subgraphs[0]->tensors[6]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[6]->quantization->scale[0],
-                  0.45);
-  EXPECT_EQ(model->subgraphs[0]->tensors[6]->quantization->zero_point[0], 156);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[7]->name, "tensor_7");
-  EXPECT_EQ(model->subgraphs[0]->tensors[7]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[7]->quantization->scale[0],
-                  0.22);
-  EXPECT_EQ(model->subgraphs[0]->tensors[7]->quantization->zero_point[0], 178);
-
-  // Ops.
+  EXPECT_EQ(model->operator_codes.size(), 3);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 5);
   EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 0);
   EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 0);
   EXPECT_EQ(model->subgraphs[0]->operators[2]->opcode_index, 1);
   EXPECT_EQ(model->subgraphs[0]->operators[3]->opcode_index, 0);
   EXPECT_EQ(model->subgraphs[0]->operators[4]->opcode_index, 0);
+
+  auto input_quant_1 = model->subgraphs[0]->operators[0].get();
+  auto input_1 = model->subgraphs[0]->tensors[input_quant_1->inputs[0]].get();
+  EXPECT_EQ(input_1->name, "tensor_0");
+  EXPECT_EQ(input_1->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(input_1->quantization->scale[0], 0.35);
+  EXPECT_EQ(input_1->quantization->zero_point[0], 156);
+
+  auto input_quant_2 = model->subgraphs[0]->operators[1].get();
+  auto input_2 = model->subgraphs[0]->tensors[input_quant_2->inputs[0]].get();
+  EXPECT_EQ(input_2->name, "tensor_1");
+  EXPECT_EQ(input_2->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(input_2->quantization->scale[0], 0.12);
+  EXPECT_EQ(input_2->quantization->zero_point[0], 178);
+
+  auto output_quant_1 = model->subgraphs[0]->operators[3].get();
+  auto output_1 =
+      model->subgraphs[0]->tensors[output_quant_1->outputs[0]].get();
+  EXPECT_EQ(output_1->name, "tensor_6");
+  EXPECT_EQ(output_1->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(output_1->quantization->scale[0], 0.45);
+  EXPECT_EQ(output_1->quantization->zero_point[0], 156);
+
+  auto output_quant_2 = model->subgraphs[0]->operators[4].get();
+  auto output_2 =
+      model->subgraphs[0]->tensors[output_quant_2->outputs[0]].get();
+  EXPECT_EQ(output_2->name, "tensor_7");
+  EXPECT_EQ(output_2->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(output_2->quantization->scale[0], 0.22);
+  EXPECT_EQ(output_2->quantization->zero_point[0], 178);
 }
 
 TEST(ModelInterface, Int8MutipleInputOutput) {
-  auto model = CreateModelMultipleInputOutput();
+  auto model = CreateQuantizedModelMultipleInputOutput();
 
   // Change model type.
   flatbuffers::FlatBufferBuilder builder;
@@ -446,45 +463,45 @@ TEST(ModelInterface, Int8MutipleInputOutput) {
             kTfLiteOk);
 
   // Verify results.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->tensors.size(), 4);
+  // TODO (b/158254056): Remove unused inputs and outputs from tensor list
+  // EXPECT_EQ(model->subgraphs[0]->tensors.size(), 4);
+  EXPECT_EQ(model->subgraphs[0]->tensors.size(), 6);
   EXPECT_EQ(model->subgraphs[0]->inputs.size(), 2);
-  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
-  EXPECT_EQ(model->subgraphs[0]->inputs[1], 1);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 2);
+  EXPECT_EQ(model->subgraphs[0]->inputs[1], 3);
   EXPECT_EQ(model->subgraphs[0]->outputs.size(), 2);
-  EXPECT_EQ(model->subgraphs[0]->outputs[0], 2);
-  EXPECT_EQ(model->subgraphs[0]->outputs[1], 3);
-  EXPECT_EQ(model->buffers.size(), 1);
-
-  // Tensors,
-  EXPECT_EQ(model->subgraphs[0]->tensors[0]->name, "tensor_0");
-  EXPECT_EQ(model->subgraphs[0]->tensors[0]->type, TensorType_INT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[0]->quantization->scale[0],
-                  0.35);
-  EXPECT_EQ(model->subgraphs[0]->tensors[0]->quantization->zero_point[0], 28);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[1]->name, "tensor_1");
-  EXPECT_EQ(model->subgraphs[0]->tensors[1]->type, TensorType_INT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[1]->quantization->scale[0],
-                  0.12);
-  EXPECT_EQ(model->subgraphs[0]->tensors[1]->quantization->zero_point[0], 50);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->name, "tensor_2");
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->type, TensorType_INT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[2]->quantization->scale[0],
-                  0.45);
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->quantization->zero_point[0], 28);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->name, "tensor_3");
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->type, TensorType_INT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[3]->quantization->scale[0],
-                  0.22);
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->quantization->zero_point[0], 50);
-
-  // Ops.
+  EXPECT_EQ(model->subgraphs[0]->outputs[0], 4);
+  EXPECT_EQ(model->subgraphs[0]->outputs[1], 5);
+  EXPECT_EQ(model->operator_codes.size(), 3);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 1);
   EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 1);
+
+  auto fc_op = model->subgraphs[0]->operators[0].get();
+
+  auto input_1 = model->subgraphs[0]->tensors[fc_op->inputs[0]].get();
+  EXPECT_EQ(input_1->name, "tensor_2");
+  EXPECT_EQ(input_1->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(input_1->quantization->scale[0], 0.35);
+  EXPECT_EQ(input_1->quantization->zero_point[0], 28);
+
+  auto input_2 = model->subgraphs[0]->tensors[fc_op->inputs[1]].get();
+  EXPECT_EQ(input_2->name, "tensor_3");
+  EXPECT_EQ(input_2->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(input_2->quantization->scale[0], 0.12);
+  EXPECT_EQ(input_2->quantization->zero_point[0], 50);
+
+  auto output_1 = model->subgraphs[0]->tensors[fc_op->outputs[0]].get();
+  EXPECT_EQ(output_1->name, "tensor_4");
+  EXPECT_EQ(output_1->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(output_1->quantization->scale[0], 0.45);
+  EXPECT_EQ(output_1->quantization->zero_point[0], 28);
+
+  auto output_2 = model->subgraphs[0]->tensors[fc_op->outputs[1]].get();
+  EXPECT_EQ(output_2->name, "tensor_5");
+  EXPECT_EQ(output_2->type, TensorType_INT8);
+  EXPECT_FLOAT_EQ(output_2->quantization->scale[0], 0.22);
+  EXPECT_EQ(output_2->quantization->zero_point[0], 50);
 }
 
 TEST(ModelInterface, Float) {
@@ -510,47 +527,32 @@ TEST(ModelInterface, Float) {
   model.reset(output_model->UnPack());
 
   // Verify results.
-  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->subgraphs.size(), 1);
-  EXPECT_EQ(model->subgraphs[0]->operators.size(), 3);
   EXPECT_EQ(model->subgraphs[0]->tensors.size(), 4);
-  EXPECT_EQ(model->buffers.size(), 1);
-
-  // Ops.
+  EXPECT_EQ(model->subgraphs[0]->inputs.size(), 1);
+  EXPECT_EQ(model->subgraphs[0]->inputs[0], 0);
+  EXPECT_EQ(model->subgraphs[0]->outputs.size(), 1);
+  EXPECT_EQ(model->subgraphs[0]->outputs[0], 1);
+  EXPECT_EQ(model->operator_codes.size(), 3);
   EXPECT_EQ(model->operator_codes[0]->builtin_code,
             BuiltinOperator_FULLY_CONNECTED);
   EXPECT_EQ(model->operator_codes[1]->builtin_code, BuiltinOperator_DEQUANTIZE);
   EXPECT_EQ(model->operator_codes[2]->builtin_code, BuiltinOperator_QUANTIZE);
+  EXPECT_EQ(model->subgraphs[0]->operators.size(), 3);
 
-  EXPECT_EQ(model->subgraphs[0]->operators[0]->opcode_index, 1);
-  EXPECT_EQ(model->subgraphs[0]->operators[1]->opcode_index, 0);
-  EXPECT_EQ(model->subgraphs[0]->operators[2]->opcode_index, 2);
+  auto dequantize_op = model->subgraphs[0]->operators[0].get();
+  auto input = model->subgraphs[0]->tensors[dequantize_op->inputs[0]].get();
+  EXPECT_EQ(input->name, "tensor_0_uint8");
+  EXPECT_EQ(input->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(input->quantization->scale[0], 0.4);
+  EXPECT_EQ(input->quantization->zero_point[0], 2);
 
-  EXPECT_THAT(model->subgraphs[0]->operators[0]->inputs, ElementsAreArray({2}));
-  EXPECT_THAT(model->subgraphs[0]->operators[0]->outputs,
-              ElementsAreArray({0}));
-  EXPECT_THAT(model->subgraphs[0]->operators[1]->inputs, ElementsAreArray({0}));
-  EXPECT_THAT(model->subgraphs[0]->operators[1]->outputs,
-              ElementsAreArray({1}));
-  EXPECT_THAT(model->subgraphs[0]->operators[2]->inputs, ElementsAreArray({1}));
-  EXPECT_THAT(model->subgraphs[0]->operators[2]->outputs,
-              ElementsAreArray({3}));
-
-  // Tensors.
-  EXPECT_EQ(model->subgraphs[0]->tensors[0]->name, "tensor_0");
-  EXPECT_EQ(model->subgraphs[0]->tensors[0]->type, TensorType_FLOAT32);
-  EXPECT_EQ(model->subgraphs[0]->tensors[1]->name, "tensor_1");
-  EXPECT_EQ(model->subgraphs[0]->tensors[1]->type, TensorType_FLOAT32);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->name, "tensor_0_uint8");
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[2]->quantization->scale[0], 0.4);
-  EXPECT_EQ(model->subgraphs[0]->tensors[2]->quantization->zero_point[0], 2);
-
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->name, "tensor_1_uint8");
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->type, TensorType_UINT8);
-  EXPECT_FLOAT_EQ(model->subgraphs[0]->tensors[3]->quantization->scale[0], 0.5);
-  EXPECT_EQ(model->subgraphs[0]->tensors[3]->quantization->zero_point[0], -5);
+  auto quantize_op = model->subgraphs[0]->operators[2].get();
+  auto output = model->subgraphs[0]->tensors[quantize_op->outputs[0]].get();
+  EXPECT_EQ(output->name, "tensor_1_uint8");
+  EXPECT_EQ(output->type, TensorType_UINT8);
+  EXPECT_FLOAT_EQ(output->quantization->scale[0], 0.5);
+  EXPECT_EQ(output->quantization->zero_point[0], -5);
 }
 
 }  // namespace