IVGCVSW-7752 DTS: Fix QuantizePerChannel tests

* Added validation for scale on all Quantized types
* Added Encoder for Per Axis UINT16 Symmetrical Quantized type
* Added error for Per Axis Asymmetrical Quantized type not supported

Signed-off-by: John Mcloughlin <john.mcloughlin@arm.com>
Change-Id: I433519ccacd71219a92bde2b81955d6abf9219c5

1 files changed, 28 insertions, 1 deletions

diff --git a/src/backends/reference/workloads/BaseIterator.hpp b/src/backends/reference/workloads/BaseIterator.hpp
index 2d27951b73..1665c1ff46 100644
--- a/src/backends/reference/workloads/BaseIterator.hpp
+++ b/src/backends/reference/workloads/BaseIterator.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2017 Arm Ltd. All rights reserved.
+// Copyright © 2017-2023 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -896,4 +896,31 @@ private:
     std::vector<float> m_Scales;
 };
 
+class QSymm16PerAxisEncoder : public PerAxisIterator<int16_t, Encoder<float>>
+{
+public:
+    QSymm16PerAxisEncoder(int16_t* data, const std::vector<float>& scale,
+                          unsigned int axisFactor, unsigned int axisDimensionality)
+            : PerAxisIterator(data, axisFactor, axisDimensionality), m_Scale(scale) {}
+
+    void Set(float right)
+    {
+        *m_Iterator = armnn::Quantize<int16_t>(right, m_Scale[m_AxisIndex], 0);
+    }
+
+    float Get() const
+    {
+        return armnn::Dequantize(*m_Iterator, m_Scale[m_AxisIndex], 0);
+    }
+
+    // Get scale of the current value
+    float GetScale() const
+    {
+        return m_Scale[m_AxisIndex];
+    }
+
+private:
+    std::vector<float> m_Scale;
+};
+
 } // namespace armnn