IVGCVSW-6268 Add support of Unidirectional Sequence Lstm fp32/fp16 to Neon

!ComputeLibrary:7150

Signed-off-by: Cathal Corbett <cathal.corbett@arm.com>
Change-Id: I3de48ffc8d08c95a22705e2b68d069791bddae73

3 files changed, 59 insertions, 0 deletions

diff --git a/src/backends/aclCommon/ArmComputeTensorUtils.cpp b/src/backends/aclCommon/ArmComputeTensorUtils.cpp
index 9ed7b7b437..2dc6d2a2b2 100644
--- a/src/backends/aclCommon/ArmComputeTensorUtils.cpp
+++ b/src/backends/aclCommon/ArmComputeTensorUtils.cpp
@@ -45,6 +45,38 @@ arm_compute::DataType GetArmComputeDataType(armnn::DataType dataType, bool multi
     }
 }
 
+armnn::DataType GetArmNNDataType(arm_compute::DataType dataType)
+{
+    switch(dataType)
+    {
+        case arm_compute::DataType::BFLOAT16:
+            return armnn::DataType::BFloat16;
+        case arm_compute::DataType::U8:
+            return armnn::DataType::Boolean;
+        case arm_compute::DataType::F16:
+            return armnn::DataType::Float16;
+        case arm_compute::DataType::F32:
+            return armnn::DataType::Float32;
+        case arm_compute::DataType::QASYMM8_SIGNED:
+            return armnn::DataType::QAsymmS8;
+        case arm_compute::DataType::QASYMM8:
+            return armnn::DataType::QAsymmU8;
+        case arm_compute::DataType::QSYMM16:
+            return armnn::DataType::QSymmS16;
+        case arm_compute::DataType::S64:
+            return armnn::DataType::Signed64;
+        case arm_compute::DataType::QSYMM8_PER_CHANNEL:
+            return armnn::DataType::QSymmS8;
+        case arm_compute::DataType::QSYMM8:
+            return armnn::DataType::QSymmS8;
+        case arm_compute::DataType::S32:
+            return armnn::DataType::Signed32;
+        default:
+            ARMNN_ASSERT_MSG(false, "Unknown data type");
+            return armnn::DataType::Float32;
+    }
+}
+
 arm_compute::Coordinates BuildArmComputeReductionCoordinates(size_t inputDimensions,
                                                              unsigned int originalInputRank,
                                                              const std::vector<unsigned int>& armnnAxes)
diff --git a/src/backends/aclCommon/ArmComputeTensorUtils.hpp b/src/backends/aclCommon/ArmComputeTensorUtils.hpp
index 30df31b79d..ba6ef6a3fe 100644
--- a/src/backends/aclCommon/ArmComputeTensorUtils.hpp
+++ b/src/backends/aclCommon/ArmComputeTensorUtils.hpp
@@ -25,6 +25,9 @@ namespace armcomputetensorutils
 /// Utility function to map an armnn::DataType to corresponding arm_compute::DataType.
 arm_compute::DataType GetArmComputeDataType(armnn::DataType dataType, bool multiScales);
 
+/// Utility function to map an arm_compute::DataType to corresponding armnn::DataType.
+armnn::DataType GetArmNNDataType(arm_compute::DataType datatype);
+
 /// Utility function used to set up an arm_compute::Coordinates from a vector of ArmNN Axes for reduction functions
 arm_compute::Coordinates BuildArmComputeReductionCoordinates(size_t inputDimensions,
                                                              unsigned int originalInputRank,
diff --git a/src/backends/aclCommon/ArmComputeUtils.hpp b/src/backends/aclCommon/ArmComputeUtils.hpp
index e76af02765..fab52ffb0f 100644
--- a/src/backends/aclCommon/ArmComputeUtils.hpp
+++ b/src/backends/aclCommon/ArmComputeUtils.hpp
@@ -112,6 +112,30 @@ ConvertAdditionalInfoToAclActivationLayerInfo(const QueueDescriptor& queueDescri
     return arm_compute::ActivationLayerInfo();
 }
 
+inline arm_compute::ActivationLayerInfo
+ConvertLstmActivationFuncToAclLayerInfo(uint32_t activationFunction)
+{
+    // For preparing the object for the class ActivationLayerInfo, we need to consider 5 situations.
+    switch (activationFunction)
+    {
+        case 0:
+            return arm_compute::ActivationLayerInfo(); // no activation, do nothing
+        case 1:
+            return arm_compute::ActivationLayerInfo(arm_compute::ActivationLayerInfo::ActivationFunction::RELU);
+        case 3:
+            return arm_compute::ActivationLayerInfo(
+                arm_compute::ActivationLayerInfo::ActivationFunction::BOUNDED_RELU, 6.0);
+        case 4:
+            return arm_compute::ActivationLayerInfo(
+                arm_compute::ActivationLayerInfo::ActivationFunction::TANH, 1.0, 1.0);
+        case 6:
+            return arm_compute::ActivationLayerInfo(
+                arm_compute::ActivationLayerInfo::ActivationFunction::LOGISTIC);
+        default:
+            throw armnn::Exception("Wrong Type of Activation Function!");
+    }
+}
+
 inline arm_compute::ComparisonOperation ConvertComparisonOperationToAcl(const ComparisonDescriptor& descriptor)
 {
     switch (descriptor.m_Operation)