IVGCVSW-2874 Add DequantizeLayer and no-op factory method

*Add Dequantize layer to the frontend
*Add Serializer and Deserializer for Dequantize

Change-Id: Ide2647b9e0348d599deb97e61ca4bf66e2f17fc0
Signed-off-by: Nattapat Chaimanowong <nattapat.chaimanowong@arm.com>

7 files changed, 54 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/LayerSupportBase.cpp b/src/backends/backendsCommon/LayerSupportBase.cpp
index 137e77eebe..04f822cea9 100644
--- a/src/backends/backendsCommon/LayerSupportBase.cpp
+++ b/src/backends/backendsCommon/LayerSupportBase.cpp
@@ -115,6 +115,13 @@ bool LayerSupportBase::IsDepthwiseConvolutionSupported(const TensorInfo& input,
     return DefaultLayerSupport(__func__, __FILE__, __LINE__, reasonIfUnsupported);
 }
 
+bool LayerSupportBase::IsDequantizeSupported(const TensorInfo& input,
+                                             const TensorInfo& output,
+                                             Optional<std::string&> reasonIfUnsupported) const
+{
+    return DefaultLayerSupport(__func__, __FILE__, __LINE__, reasonIfUnsupported);
+}
+
 bool LayerSupportBase::IsDetectionPostProcessSupported(const armnn::TensorInfo& input0,
                                                        const armnn::TensorInfo& input1,
                                                        const armnn::DetectionPostProcessDescriptor& descriptor,
diff --git a/src/backends/backendsCommon/LayerSupportBase.hpp b/src/backends/backendsCommon/LayerSupportBase.hpp
index ceb3b2768e..7d64095667 100644
--- a/src/backends/backendsCommon/LayerSupportBase.hpp
+++ b/src/backends/backendsCommon/LayerSupportBase.hpp
@@ -67,6 +67,10 @@ public:
                                          const Optional<TensorInfo>& biases,
                                          Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;
 
+    bool IsDequantizeSupported(const TensorInfo& input,
+                               const TensorInfo& output,
+                               Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;
+
     bool IsDetectionPostProcessSupported(const TensorInfo& input0,
                                          const TensorInfo& input1,
                                          const DetectionPostProcessDescriptor& descriptor,
diff --git a/src/backends/backendsCommon/WorkloadData.cpp b/src/backends/backendsCommon/WorkloadData.cpp
index e30a3f36b7..91b1c5790b 100644
--- a/src/backends/backendsCommon/WorkloadData.cpp
+++ b/src/backends/backendsCommon/WorkloadData.cpp
@@ -1153,6 +1153,23 @@ void DetectionPostProcessQueueDescriptor::Validate(const WorkloadInfo& workloadI
     }
 }
 
+void DequantizeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
+{
+    ValidateSingleInput(workloadInfo, "DequantizeQueueDescriptor");
+    ValidateSingleOutput(workloadInfo, "DequantizeQueueDescriptor");
+
+    if (workloadInfo.m_InputTensorInfos[0].GetDataType() != DataType::QuantisedAsymm8 &&
+        workloadInfo.m_InputTensorInfos[0].GetDataType() != DataType::QuantisedSymm16)
+    {
+        throw InvalidArgumentException("Input to dequantize layer must be quantized type.");
+    }
+
+    if (workloadInfo.m_OutputTensorInfos[0].GetDataType() != DataType::Float32)
+    {
+        throw InvalidArgumentException("Output of dequantize layer must be Float32 type.");
+    }
+}
+
 void PreCompiledQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
 {
     // This is internally generated so it should not need validation.
diff --git a/src/backends/backendsCommon/WorkloadData.hpp b/src/backends/backendsCommon/WorkloadData.hpp
index 9250ceac43..5640701d82 100644
--- a/src/backends/backendsCommon/WorkloadData.hpp
+++ b/src/backends/backendsCommon/WorkloadData.hpp
@@ -416,4 +416,9 @@ struct PreCompiledQueueDescriptor : QueueDescriptorWithParameters<PreCompiledDes
     void Validate(const WorkloadInfo& workloadInfo) const;
 };
 
+struct DequantizeQueueDescriptor : QueueDescriptor
+{
+    void Validate(const WorkloadInfo& workloadInfo) const;
+};
+
 } //namespace armnn
diff --git a/src/backends/backendsCommon/WorkloadFactory.cpp b/src/backends/backendsCommon/WorkloadFactory.cpp
index 833f3b894e..6534a00343 100644
--- a/src/backends/backendsCommon/WorkloadFactory.cpp
+++ b/src/backends/backendsCommon/WorkloadFactory.cpp
@@ -229,6 +229,16 @@ bool IWorkloadFactory::IsLayerSupported(const BackendId& backendId,
                                                      reason);
             break;
         }
+        case LayerType::Dequantize:
+        {
+            const TensorInfo& input = layer.GetInputSlot(0).GetConnection()->GetTensorInfo();
+            const TensorInfo& output = layer.GetOutputSlot(0).GetTensorInfo();
+
+            result = layerSupportObject->IsDequantizeSupported(OverrideDataType(input, dataType),
+                                                               OverrideDataType(output, DataType::Float32),
+                                                               reason);
+            break;
+        }
         case LayerType::DetectionPostProcess:
         {
             const TensorInfo& input0 = layer.GetInputSlot(0).GetConnection()->GetTensorInfo();
@@ -821,6 +831,12 @@ std::unique_ptr<IWorkload> IWorkloadFactory::CreateDepthwiseConvolution2d(
     return std::unique_ptr<IWorkload>();
 }
 
+std::unique_ptr<IWorkload> IWorkloadFactory::CreateDequantize(
+    const DequantizeQueueDescriptor& descriptor, const WorkloadInfo& info) const
+{
+    return std::unique_ptr<IWorkload>();
+}
+
 std::unique_ptr<IWorkload> IWorkloadFactory::CreateDetectionPostProcess(
     const DetectionPostProcessQueueDescriptor& descriptor, const WorkloadInfo& info) const
 {
diff --git a/src/backends/backendsCommon/WorkloadFactory.hpp b/src/backends/backendsCommon/WorkloadFactory.hpp
index 2aa3854c4a..ed7303cf33 100644
--- a/src/backends/backendsCommon/WorkloadFactory.hpp
+++ b/src/backends/backendsCommon/WorkloadFactory.hpp
@@ -79,6 +79,9 @@ public:
     virtual std::unique_ptr<IWorkload> CreateDepthwiseConvolution2d(
         const DepthwiseConvolution2dQueueDescriptor& descriptor, const WorkloadInfo& info) const;
 
+    virtual std::unique_ptr<IWorkload> CreateDequantize(const DequantizeQueueDescriptor& descriptor,
+                                                        const WorkloadInfo& info) const;
+
     virtual std::unique_ptr<IWorkload> CreateDetectionPostProcess(
         const DetectionPostProcessQueueDescriptor& descriptor, const WorkloadInfo& info) const;
 
diff --git a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
index 8f86132274..26fb03f55d 100644
--- a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
+++ b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
@@ -336,6 +336,8 @@ DECLARE_LAYER_POLICY_1_PARAM(Debug)
 
 DECLARE_LAYER_POLICY_2_PARAM(DepthwiseConvolution2d)
 
+DECLARE_LAYER_POLICY_1_PARAM(Dequantize)
+
 DECLARE_LAYER_POLICY_2_PARAM(DetectionPostProcess)
 
 DECLARE_LAYER_POLICY_1_PARAM(Equal)