backends/reference: Add ReduceSum operation support

This patch addes ReduceSum operation support for reference backend,
which computes the sum of elements across dimensions of a tensor.

Changelog v1:
- Fix file header descriptions.

Chagelog v2:
- Fix line limit issue.
- Fix type conversion issue.

Changelog v3:
- Remove tabs.
- Modify newly added file headers.

Changelog v4:
- Symbol on header isn't allowed so drop it from newly added file headers.

Changelog v5:
- Remove tabs, fix the use of brackets and align lines correctly.

Changelog v6:
- Add serializer and deserializer support.

Changelog v7:
- Fix build error add missed code.

Changelog v8:
- Rename ReduceSumDecriptor to ReduceDescriptor
    - Update m_KeepDims field data type to bool on ReduceDescriptor
    - Add ReduceOperation field to ReduceDescriptor

- Rename ReduceSumLayer to ReduceLayer
    - Update ReduceLayer to use ReduceDescriptor
    - Update ReduceLayer::ValidateTensorShapesFromInputs() function

- Rename RefReduceSumWokload to RefReduceWorkload
    - Update workload to use ReduceDescriptor
    - Update workload to use Decoders and Encoders

- Remove ReduceSum.hpp and ReduceSum.cpp
- Added Reduce.hpp and Reduce.cpp
     - Move Mean.cpp (which is implementing REDUCE_MEAN) functionality to Reduce.cpp
     - Update RefMeanWorkload to call Reduce function with ReduceOperation::Mean argument

- Remove Mean.hpp and Mean.cpp
- Update the Serializer/Deserializer ArmnnSchema.fbs for ReduceLayer, ReduceDescriptor, and ReduceOperation
- Update Serializer and Deserializer for serializing/parsing ReduceLayer
- Added TfLiter parser Sum test for REDUCE_SUM operator
- Make corresponding changes on front-end and Ref backend to support REDUCE_SUM operator

Changelog v9:
- Fixed build errors.

Change-Id: I8c8e034f3df73f9565b3c18eff51ecca6c542195
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/backends/reference/workloads/RefReduceWorkload.cpp b/src/backends/reference/workloads/RefReduceWorkload.cpp
new file mode 100644
index 0000000000..7a46ff9ffc
--- /dev/null
+++ b/src/backends/reference/workloads/RefReduceWorkload.cpp
@@ -0,0 +1,42 @@
+//
+// Copyright © 2020 Samsung Electronics Co Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "RefReduceWorkload.hpp"
+
+#include "Reduce.hpp"
+#include "RefWorkloadUtils.hpp"
+#include "BaseIterator.hpp"
+#include "Profiling.hpp"
+
+namespace armnn
+{
+
+RefReduceWorkload::RefReduceWorkload(
+    const ReduceQueueDescriptor& descriptor,
+    const WorkloadInfo& info)
+    : BaseWorkload<ReduceQueueDescriptor>(descriptor, info) {}
+
+void RefReduceWorkload::Execute() const
+{
+    ARMNN_SCOPED_PROFILING_EVENT(Compute::CpuRef, "RefReduceWorkload_Execute");
+
+    const TensorInfo& inputInfo  = GetTensorInfo(m_Data.m_Inputs[0]);
+    const TensorInfo& outputInfo = GetTensorInfo(m_Data.m_Outputs[0]);
+
+    std::unique_ptr<Decoder<float>> decoderPtr = MakeDecoder<float>(inputInfo, m_Data.m_Inputs[0]->Map());
+    Decoder<float>& decoder = *decoderPtr;
+
+    std::unique_ptr<Encoder<float>> encoderPtr = MakeEncoder<float>(outputInfo, m_Data.m_Outputs[0]->Map());
+    Encoder<float>& encoder = *encoderPtr;
+
+    Reduce(inputInfo,
+           outputInfo,
+           decoder,
+           encoder,
+           m_Data.m_Parameters.m_vAxis,
+           m_Data.m_Parameters.m_ReduceOperation);
+}
+
+} //namespace armnn