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, 32 insertions, 0 deletions

diff --git a/include/armnn/Descriptors.hpp b/include/armnn/Descriptors.hpp
index f023e00e93..d6e37e535e 100644
--- a/include/armnn/Descriptors.hpp
+++ b/include/armnn/Descriptors.hpp
@@ -1286,4 +1286,36 @@ struct LogicalBinaryDescriptor
     LogicalBinaryOperation m_Operation;
 };
 
+/// A ReduceDescriptor for the REDUCE operators.
+struct ReduceDescriptor
+{
+    ReduceDescriptor()
+        : m_TargetHeight(0)
+        , m_TargetWidth(0)
+        , m_KeepDims(false)
+        , m_vAxis()
+        , m_ReduceOperation(ReduceOperation::Sum)
+    {}
+
+    bool operator ==(const ReduceDescriptor& rhs) const
+    {
+        return m_TargetHeight         == rhs.m_TargetHeight &&
+               m_TargetWidth          == rhs.m_TargetWidth &&
+               m_KeepDims             == rhs.m_KeepDims &&
+               m_vAxis                == rhs.m_vAxis &&
+               m_ReduceOperation      == rhs.m_ReduceOperation;
+    }
+
+    /// Target height value.
+    uint32_t m_TargetHeight;
+    /// Target width value.
+    uint32_t m_TargetWidth;
+    /// if true then output shape has no change.
+    bool m_KeepDims;
+    /// The indices of the dimensions to reduce.
+    std::vector<uint32_t> m_vAxis;
+    /// Specifies the reduction operation to execute
+    ReduceOperation m_ReduceOperation;
+};
+
 } // namespace armnn