IVGCVSW-3364 Add serialization support for Resize layer

Signed-off-by: FinnWilliamsArm <Finn.Williams@arm.com>
Change-Id: I3b1af816cefc1760f63324f365de93f899c9c9ee

6 files changed, 110 insertions, 3 deletions

diff --git a/src/armnnSerializer/ArmnnSchema.fbs b/src/armnnSerializer/ArmnnSchema.fbs
index 7969d10598..09187927ae 100644
--- a/src/armnnSerializer/ArmnnSchema.fbs
+++ b/src/armnnSerializer/ArmnnSchema.fbs
@@ -36,6 +36,11 @@ enum DataLayout : byte {
     NCHW = 1
 }
 
+enum ResizeMethod: byte {
+    NearestNeighbor = 0,
+    Bilinear = 1,
+}
+
 table TensorInfo {
     dimensions:[uint];
     dataType:DataType;
@@ -124,7 +129,8 @@ enum LayerType : uint {
     Concat = 39,
     SpaceToDepth = 40,
     Prelu = 41,
-    TransposeConvolution2d = 42
+    TransposeConvolution2d = 42,
+    Resize = 43
 }
 
 // Base layer table to be used as part of other layers
@@ -581,6 +587,18 @@ table TransposeConvolution2dDescriptor {
     dataLayout:DataLayout = NCHW;
 }
 
+table ResizeLayer {
+    base:LayerBase;
+    descriptor:ResizeDescriptor;
+}
+
+table ResizeDescriptor {
+    targetHeight:uint;
+    targetWidth:uint;
+    method:ResizeMethod = NearestNeighbor;
+    dataLayout:DataLayout;
+}
+
 union Layer {
     ActivationLayer,
     AdditionLayer,
@@ -624,7 +642,8 @@ union Layer {
     ConcatLayer,
     SpaceToDepthLayer,
     PreluLayer,
-    TransposeConvolution2dLayer
+    TransposeConvolution2dLayer,
+    ResizeLayer
 }
 
 table AnyLayer {
diff --git a/src/armnnSerializer/Serializer.cpp b/src/armnnSerializer/Serializer.cpp
index 2d5877db63..57d674095b 100644
--- a/src/armnnSerializer/Serializer.cpp
+++ b/src/armnnSerializer/Serializer.cpp
@@ -660,7 +660,20 @@ void SerializerVisitor::VisitResizeLayer(const armnn::IConnectableLayer* layer,
                                          const armnn::ResizeDescriptor& resizeDescriptor,
                                          const char* name)
 {
-    throw armnn::Exception("SerializerVisitor::VisitResizeLayer is not yet implemented");
+    auto flatBufferBaseLayer = CreateLayerBase(layer, serializer::LayerType::LayerType_Resize);
+
+    auto flatBufferDescriptor =
+            CreateResizeDescriptor(m_flatBufferBuilder,
+                                   resizeDescriptor.m_TargetHeight,
+                                   resizeDescriptor.m_TargetWidth,
+                                   GetFlatBufferResizeMethod(resizeDescriptor.m_Method),
+                                   GetFlatBufferDataLayout(resizeDescriptor.m_DataLayout));
+
+    auto flatBufferLayer = serializer::CreateResizeLayer(m_flatBufferBuilder,
+                                                         flatBufferBaseLayer,
+                                                         flatBufferDescriptor);
+
+    CreateAnyLayer(flatBufferLayer.o, serializer::Layer::Layer_ResizeLayer);
 }
 
 void SerializerVisitor::VisitRsqrtLayer(const armnn::IConnectableLayer* layer, const char* name)
diff --git a/src/armnnSerializer/SerializerSupport.md b/src/armnnSerializer/SerializerSupport.md
index 99bc332ac8..924bab423f 100644
--- a/src/armnnSerializer/SerializerSupport.md
+++ b/src/armnnSerializer/SerializerSupport.md
@@ -46,6 +46,7 @@ The Arm NN SDK Serializer currently supports the following layers:
 * Subtraction
 * Switch
 * TransposeConvolution2d
+* Resize
 
 More machine learning layers will be supported in future releases.
 
diff --git a/src/armnnSerializer/SerializerUtils.cpp b/src/armnnSerializer/SerializerUtils.cpp
index bfe795c8c4..9790d6e23b 100644
--- a/src/armnnSerializer/SerializerUtils.cpp
+++ b/src/armnnSerializer/SerializerUtils.cpp
@@ -124,4 +124,17 @@ armnnSerializer::NormalizationAlgorithmMethod GetFlatBufferNormalizationAlgorith
     }
 }
 
+armnnSerializer::ResizeMethod GetFlatBufferResizeMethod(armnn::ResizeMethod method)
+{
+    switch (method)
+    {
+        case armnn::ResizeMethod::NearestNeighbor:
+            return armnnSerializer::ResizeMethod_NearestNeighbor;
+        case armnn::ResizeMethod::Bilinear:
+            return armnnSerializer::ResizeMethod_Bilinear;
+        default:
+            return armnnSerializer::ResizeMethod_NearestNeighbor;
+    }
+}
+
 } // namespace armnnSerializer
\ No newline at end of file
diff --git a/src/armnnSerializer/SerializerUtils.hpp b/src/armnnSerializer/SerializerUtils.hpp
index 29cda0d629..578689b2dd 100644
--- a/src/armnnSerializer/SerializerUtils.hpp
+++ b/src/armnnSerializer/SerializerUtils.hpp
@@ -30,4 +30,6 @@ armnnSerializer::NormalizationAlgorithmChannel GetFlatBufferNormalizationAlgorit
 armnnSerializer::NormalizationAlgorithmMethod GetFlatBufferNormalizationAlgorithmMethod(
     armnn::NormalizationAlgorithmMethod normalizationAlgorithmMethod);
 
+armnnSerializer::ResizeMethod GetFlatBufferResizeMethod(armnn::ResizeMethod method);
+
 } // namespace armnnSerializer
diff --git a/src/armnnSerializer/test/SerializerTests.cpp b/src/armnnSerializer/test/SerializerTests.cpp
index 294adec12e..e51f76bd33 100644
--- a/src/armnnSerializer/test/SerializerTests.cpp
+++ b/src/armnnSerializer/test/SerializerTests.cpp
@@ -2025,6 +2025,65 @@ BOOST_AUTO_TEST_CASE(SerializeReshape)
     deserializedNetwork->Accept(verifier);
 }
 
+BOOST_AUTO_TEST_CASE(SerializeResize)
+{
+    class ResizeLayerVerifier : public LayerVerifierBase
+    {
+    public:
+        ResizeLayerVerifier(const std::string& layerName,
+                            const std::vector<armnn::TensorInfo>& inputInfos,
+                            const std::vector<armnn::TensorInfo>& outputInfos,
+                            const armnn::ResizeDescriptor& descriptor)
+                : LayerVerifierBase(layerName, inputInfos, outputInfos)
+                , m_Descriptor(descriptor) {}
+
+        void VisitResizeLayer(const armnn::IConnectableLayer* layer,
+                                      const armnn::ResizeDescriptor& descriptor,
+                                      const char* name) override
+        {
+            VerifyNameAndConnections(layer, name);
+            VerifyDescriptor(descriptor);
+        }
+
+    private:
+        void VerifyDescriptor(const armnn::ResizeDescriptor& descriptor)
+        {
+            BOOST_CHECK(descriptor.m_DataLayout == m_Descriptor.m_DataLayout);
+            BOOST_CHECK(descriptor.m_TargetWidth == m_Descriptor.m_TargetWidth);
+            BOOST_CHECK(descriptor.m_TargetHeight == m_Descriptor.m_TargetHeight);
+            BOOST_CHECK(descriptor.m_Method == m_Descriptor.m_Method);
+        }
+
+        armnn::ResizeDescriptor m_Descriptor;
+    };
+
+    const std::string layerName("resize");
+    const armnn::TensorInfo inputInfo = armnn::TensorInfo({1, 3, 5, 5}, armnn::DataType::Float32);
+    const armnn::TensorInfo outputInfo = armnn::TensorInfo({1, 3, 2, 4}, armnn::DataType::Float32);
+
+    armnn::ResizeDescriptor desc;
+    desc.m_TargetWidth = 4;
+    desc.m_TargetHeight = 2;
+    desc.m_Method = armnn::ResizeMethod::NearestNeighbor;
+
+    armnn::INetworkPtr network = armnn::INetwork::Create();
+    armnn::IConnectableLayer* const inputLayer = network->AddInputLayer(0);
+    armnn::IConnectableLayer* const resizeLayer = network->AddResizeLayer(desc, layerName.c_str());
+    armnn::IConnectableLayer* const outputLayer = network->AddOutputLayer(0);
+
+    inputLayer->GetOutputSlot(0).Connect(resizeLayer->GetInputSlot(0));
+    resizeLayer->GetOutputSlot(0).Connect(outputLayer->GetInputSlot(0));
+
+    inputLayer->GetOutputSlot(0).SetTensorInfo(inputInfo);
+    resizeLayer->GetOutputSlot(0).SetTensorInfo(outputInfo);
+
+    armnn::INetworkPtr deserializedNetwork = DeserializeNetwork(SerializeNetwork(*network));
+    BOOST_CHECK(deserializedNetwork);
+
+    ResizeLayerVerifier verifier(layerName, {inputInfo}, {outputInfo}, desc);
+    deserializedNetwork->Accept(verifier);
+}
+
 BOOST_AUTO_TEST_CASE(SerializeResizeBilinear)
 {
     class ResizeBilinearLayerVerifier : public LayerVerifierBase