IVGCVSW-4444 Adding Elu end to end test

* implemented activation layer end to end test
* adds support for different tolerances in layer tests
* added tests for Elu (Ref, Cl, Neon)

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I81e28cfb4456e815bae2fb31f5c345134ff2432f

3 files changed, 148 insertions, 4 deletions

diff --git a/src/backends/backendsCommon/test/ActivationEndToEndTestImpl.hpp b/src/backends/backendsCommon/test/ActivationEndToEndTestImpl.hpp
new file mode 100644
index 0000000000..23884b0c20
--- /dev/null
+++ b/src/backends/backendsCommon/test/ActivationEndToEndTestImpl.hpp
@@ -0,0 +1,143 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include "EndToEndTestImpl.hpp"
+
+#include <armnn/INetwork.hpp>
+#include <armnn/TypesUtils.hpp>
+#include <backendsCommon/test/CommonTestUtils.hpp>
+#include <ResolveType.hpp>
+
+#include <boost/test/unit_test_log.hpp>
+
+namespace
+{
+
+/** Defines the acceptable tolerance of ActivationFunction-DataType combinations.
+ *
+ * @param activationFunction The activation function used
+ * @param dataType  Data type used
+ *
+ * @return Tolerance depending on the activation function and data type
+ */
+float GetActivationTolerance(const armnn::ActivationFunction& activationFunction, DataType dataType)
+{
+    constexpr float defaultTolerance = 1e-6f;
+
+    switch (activationFunction)
+    {
+        // The following values are taken from ArmComputeLibrary/tests/validation/CL/ActivationLayer.cpp
+        case ActivationFunction::Elu:
+            return (dataType == DataType::Float16 ? 0.01f : 0.00001f);
+        default:
+            return defaultTolerance;
+    }
+}
+
+/** Creates a network with one layer of the activation function specified in the activation descriptor.
+ *
+ * @param inputInfo  Tensor info of inputs
+ * @param outputInfo  Tensor info of outputs
+ * @param descriptor  Activation descriptor
+ *
+ * @return INetworkPtr  A pointer to the created network
+ */
+armnn::INetworkPtr CreateActivationNetwork(const armnn::TensorInfo& inputInfo,
+                                           const armnn::TensorInfo& outputInfo,
+                                           const armnn::ActivationDescriptor& descriptor)
+{
+    using namespace armnn;
+
+    char const* ActivationName = GetActivationFunctionAsCString(descriptor.m_Function);
+
+    INetworkPtr net(INetwork::Create());
+
+    IConnectableLayer* input = net->AddInputLayer(0, "input");
+    IConnectableLayer* prelu = net->AddActivationLayer(descriptor, ActivationName);
+    IConnectableLayer* output = net->AddOutputLayer(0, "output");
+
+    Connect(input, prelu, inputInfo, 0, 0);
+    Connect(prelu, output, outputInfo, 0, 0);
+
+    return net;
+}
+
+/** Specifies the implementation of end to end tests for activation functions.
+ *
+ *  - Converts input data and expected-output data to the data type that is desired for the test (ArmnnType)
+ *  - Creates a network with one layer of the activation function specified in the activation descriptor.
+ *  - Executes the network on specified backends and compares results to expected output values
+ *
+ * @tparam ArmnnType  The armnn data type for the input and expected-output data
+ * @param backends  Backends to run test on
+ * @param floatInputData  Input data given as vector of float
+ * @param floatExpectedOutputData  Expected output data given as vector of float
+ * @param inputInfo  Tensor info of inputs
+ * @param outputInfo  Tensor info of outputs
+ * @param descriptor  Activation descriptor
+ */
+template<armnn::DataType ArmnnType, typename T = armnn::ResolveType<ArmnnType>>
+void ActivationEndToEndImpl(const std::vector<armnn::BackendId>& backends,
+                     const std::vector<float>& floatInputData,
+                     const std::vector<float>& floatExpectedOutputData,
+                     const armnn::TensorInfo&  inputInfo,
+                     const armnn::TensorInfo&  outputInfo,
+                     const armnn::ActivationDescriptor& descriptor)
+{
+    using namespace armnn;
+
+    // Selectively quantizes/transforms float values to the needed data type
+    std::vector<T> inputData          = armnnUtils::QuantizedVector<T>( floatInputData,
+                                                                        inputInfo.GetQuantizationScale(),
+                                                                        inputInfo.GetQuantizationOffset());
+    std::vector<T> expectedOutputData = armnnUtils::QuantizedVector<T>( floatExpectedOutputData,
+                                                                        outputInfo.GetQuantizationScale(),
+                                                                        outputInfo.GetQuantizationOffset());
+
+    INetworkPtr net = CreateActivationNetwork(inputInfo, outputInfo, descriptor);
+
+    std::map<int, std::vector<T>> inputTensorData          = { { 0, inputData } };
+    std::map<int, std::vector<T>> expectedOutputTensorData = { { 0, expectedOutputData } };
+
+    float tolerance = GetActivationTolerance(descriptor.m_Function, ArmnnType);
+
+    EndToEndLayerTestImpl<ArmnnType, ArmnnType>(move(net),
+                                                inputTensorData,
+                                                expectedOutputTensorData,
+                                                backends,
+                                                tolerance);
+}
+
+/** Executes an end to end test for Elu activation with specific input and expected-output data
+ *
+ * @tparam ArmnnType  The armnn data type for the input and expected-output data
+ * @param backends  The backends on which to run the test
+ */
+template<armnn::DataType ArmnnType, typename T = armnn::ResolveType<ArmnnType>>
+void EluEndToEndTest(const std::vector<BackendId>& backends)
+{
+    std::vector<float> floatInputData{ -2.0f, -1.0f, -0.0f, 0.0f,
+                                        1.0f,  2.0f,  3.0f, 4.0f };
+
+    std::vector<float> floatExpectedOutputData{ -0.86466471676f,  -0.63212055882f,  -0.0f, 0.0f,
+                                                 1.0f          ,             2.0f,   3.0f, 4.0f };
+
+    float qScale = 1.0f;
+    int32_t qOffset = 0;
+    armnn::TensorInfo inputInfo({ 2, 2, 2, 1 }, ArmnnType, qScale, qOffset);
+    armnn::TensorInfo outputInfo({ 2, 2, 2, 1 }, ArmnnType, qScale, qOffset);
+
+    armnn::ActivationDescriptor descriptor(ActivationFunction::Elu, 1.0);
+
+    ActivationEndToEndImpl<ArmnnType>(backends,
+                                      floatInputData,
+                                      floatExpectedOutputData,
+                                      inputInfo,
+                                      outputInfo,
+                                      descriptor);
+}
+
+} // anonymous namespace
\ No newline at end of file
diff --git a/src/backends/backendsCommon/test/CMakeLists.txt b/src/backends/backendsCommon/test/CMakeLists.txt
index dc8031f6b4..ea214de771 100644
--- a/src/backends/backendsCommon/test/CMakeLists.txt
+++ b/src/backends/backendsCommon/test/CMakeLists.txt
@@ -21,6 +21,7 @@ list(APPEND armnnBackendsCommonUnitTests_sources
     DynamicBackendTests.hpp
     ElementwiseUnaryEndToEndTestImpl.hpp
     EndToEndTestImpl.hpp
+    ActivationEndToEndTestImpl.hpp
     GatherEndToEndTestImpl.hpp
     InstanceNormalizationEndToEndTestImpl.cpp
     InstanceNormalizationEndToEndTestImpl.hpp
diff --git a/src/backends/backendsCommon/test/EndToEndTestImpl.hpp b/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
index 4221f626da..a4d0d505f8 100644
--- a/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
+++ b/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
@@ -107,7 +107,7 @@ inline bool ConstantUsageUint8Test(const std::vector<BackendId>& backends)
 
 // Utility template for comparing tensor elements
 template<DataType ArmnnType, typename T = ResolveType<ArmnnType>>
-bool Compare(T a, T b)
+bool Compare(T a, T b, float tolerance = 0.000001f)
 {
     if (ArmnnType == DataType::Boolean)
     {
@@ -119,7 +119,6 @@ bool Compare(T a, T b)
 
     // NOTE: All other types can be cast to float and compared with
     // a certain level of tolerance
-    constexpr float tolerance = 0.000001f;
     return std::fabs(static_cast<float>(a) - static_cast<float>(b)) <= tolerance;
 }
 
@@ -143,7 +142,8 @@ template<DataType ArmnnIType, DataType ArmnnOType,
 void EndToEndLayerTestImpl(INetworkPtr network,
                            const std::map<int, std::vector<TInput>>& inputTensorData,
                            const std::map<int, std::vector<TOutput>>& expectedOutputData,
-                           std::vector<BackendId> backends)
+                           std::vector<BackendId> backends,
+                           float tolerance = 0.000001f)
 {
     // Create runtime in which test will run
     IRuntime::CreationOptions options;
@@ -184,7 +184,7 @@ void EndToEndLayerTestImpl(INetworkPtr network,
         std::vector<TOutput> out = outputStorage.at(it.first);
         for (unsigned int i = 0; i < out.size(); ++i)
         {
-            BOOST_CHECK(Compare<ArmnnOType>(it.second[i], out[i]) == true);
+            BOOST_CHECK(Compare<ArmnnOType>(it.second[i], out[i], tolerance) == true);
         }
     }
 }