IVGCVSW-3934 Add serialization support for INSTANCE_NORMALIZATION

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: If9b4d30cbd625206ec1c7d37dd8b449983442147

4 files changed, 88 insertions, 3 deletions

diff --git a/src/armnnSerializer/ArmnnSchema.fbs b/src/armnnSerializer/ArmnnSchema.fbs
index 3f3e8fcb0b..7588b9d11e 100644
--- a/src/armnnSerializer/ArmnnSchema.fbs
+++ b/src/armnnSerializer/ArmnnSchema.fbs
@@ -141,7 +141,8 @@ enum LayerType : uint {
     Abs = 46,
     ArgMinMax = 47,
     Slice = 48,
-    DepthToSpace = 49
+    DepthToSpace = 49,
+    InstanceNormalization = 50
 }
 
 // Base layer table to be used as part of other layers
@@ -260,6 +261,18 @@ table InputLayer {
     base:BindableLayerBase;
 }
 
+table InstanceNormalizationLayer {
+    base:LayerBase;
+    descriptor:InstanceNormalizationDescriptor;
+}
+
+table InstanceNormalizationDescriptor {
+    gamma:float;
+    beta:float;
+    eps:float;
+    dataLayout:DataLayout;
+}
+
 table L2NormalizationLayer {
     base:LayerBase;
     descriptor:L2NormalizationDescriptor;
@@ -734,7 +747,8 @@ union Layer {
     AbsLayer,
     ArgMinMaxLayer,
     SliceLayer,
-    DepthToSpaceLayer
+    DepthToSpaceLayer,
+    InstanceNormalizationLayer
 }
 
 table AnyLayer {
diff --git a/src/armnnSerializer/Serializer.cpp b/src/armnnSerializer/Serializer.cpp
index 84a1b6b18e..5949d1d9fa 100644
--- a/src/armnnSerializer/Serializer.cpp
+++ b/src/armnnSerializer/Serializer.cpp
@@ -431,7 +431,17 @@ void SerializerVisitor::VisitInstanceNormalizationLayer(
     const armnn::InstanceNormalizationDescriptor& instanceNormalizationDescriptor,
     const char* name)
 {
-    throw UnimplementedException("SerializerVisitor::InstanceNormalizationLayer is not implemented");
+    auto fbDescriptor = serializer::CreateInstanceNormalizationDescriptor(
+            m_flatBufferBuilder,
+            instanceNormalizationDescriptor.m_Gamma,
+            instanceNormalizationDescriptor.m_Beta,
+            instanceNormalizationDescriptor.m_Eps,
+            GetFlatBufferDataLayout(instanceNormalizationDescriptor.m_DataLayout));
+
+    auto fbBaseLayer = CreateLayerBase(layer, serializer::LayerType::LayerType_InstanceNormalization);
+    auto fbLayer     = serializer::CreateInstanceNormalizationLayer(m_flatBufferBuilder, fbBaseLayer, fbDescriptor);
+
+    CreateAnyLayer(fbLayer.o, serializer::Layer::Layer_InstanceNormalizationLayer);
 }
 
 void SerializerVisitor::VisitL2NormalizationLayer(const armnn::IConnectableLayer* layer,
diff --git a/src/armnnSerializer/SerializerSupport.md b/src/armnnSerializer/SerializerSupport.md
index 2e6263b390..e628253f19 100644
--- a/src/armnnSerializer/SerializerSupport.md
+++ b/src/armnnSerializer/SerializerSupport.md
@@ -26,6 +26,7 @@ The Arm NN SDK Serializer currently supports the following layers:
 * Gather
 * Greater
 * Input
+* InstanceNormalization
 * L2Normalization
 * Lstm
 * Maximum
diff --git a/src/armnnSerializer/test/SerializerTests.cpp b/src/armnnSerializer/test/SerializerTests.cpp
index dfa98acbcd..98893a59cf 100644
--- a/src/armnnSerializer/test/SerializerTests.cpp
+++ b/src/armnnSerializer/test/SerializerTests.cpp
@@ -1267,6 +1267,66 @@ BOOST_AUTO_TEST_CASE(SerializeGreater)
     deserializedNetwork->Accept(verifier);
 }
 
+BOOST_AUTO_TEST_CASE(SerializeInstanceNormalization)
+{
+    class InstanceNormalizationLayerVerifier : public LayerVerifierBase
+    {
+    public:
+        InstanceNormalizationLayerVerifier(const std::string& layerName,
+                                           const std::vector<armnn::TensorInfo>& inputInfos,
+                                           const std::vector<armnn::TensorInfo>& outputInfos,
+                                           const armnn::InstanceNormalizationDescriptor& descriptor)
+            : LayerVerifierBase(layerName, inputInfos, outputInfos)
+            , m_Descriptor(descriptor) {}
+
+        void VisitInstanceNormalizationLayer(const armnn::IConnectableLayer* layer,
+                                             const armnn::InstanceNormalizationDescriptor& descriptor,
+                                             const char* name) override
+        {
+            VerifyNameAndConnections(layer, name);
+            VerifyDescriptor(descriptor);
+        }
+
+    private:
+        void VerifyDescriptor(const armnn::InstanceNormalizationDescriptor& descriptor)
+        {
+            BOOST_CHECK(descriptor.m_Gamma      == m_Descriptor.m_Gamma);
+            BOOST_CHECK(descriptor.m_Beta       == m_Descriptor.m_Beta);
+            BOOST_CHECK(descriptor.m_Eps        == m_Descriptor.m_Eps);
+            BOOST_CHECK(descriptor.m_DataLayout == m_Descriptor.m_DataLayout);
+        }
+
+        armnn::InstanceNormalizationDescriptor m_Descriptor;
+    };
+
+    const std::string layerName("instanceNormalization");
+    const armnn::TensorInfo info({ 1, 2, 1, 5 }, armnn::DataType::Float32);
+
+    armnn::InstanceNormalizationDescriptor descriptor;
+    descriptor.m_Gamma      = 1.1f;
+    descriptor.m_Beta       = 0.1f;
+    descriptor.m_Eps        = 0.0001f;
+    descriptor.m_DataLayout = armnn::DataLayout::NHWC;
+
+    armnn::INetworkPtr network = armnn::INetwork::Create();
+    armnn::IConnectableLayer* const inputLayer        = network->AddInputLayer(0);
+    armnn::IConnectableLayer* const instanceNormLayer =
+        network->AddInstanceNormalizationLayer(descriptor, layerName.c_str());
+    armnn::IConnectableLayer* const outputLayer       = network->AddOutputLayer(0);
+
+    inputLayer->GetOutputSlot(0).Connect(instanceNormLayer->GetInputSlot(0));
+    instanceNormLayer->GetOutputSlot(0).Connect(outputLayer->GetInputSlot(0));
+
+    inputLayer->GetOutputSlot(0).SetTensorInfo(info);
+    instanceNormLayer->GetOutputSlot(0).SetTensorInfo(info);
+
+    armnn::INetworkPtr deserializedNetwork = DeserializeNetwork(SerializeNetwork(*network));
+    BOOST_CHECK(deserializedNetwork);
+
+    InstanceNormalizationLayerVerifier verifier(layerName, {info}, {info}, descriptor);
+    deserializedNetwork->Accept(verifier);
+}
+
 class L2NormalizationLayerVerifier : public LayerVerifierBase
 {
 public: