From 5236e1d6bcff6ebec7ec10d7d416cc6ead5482dd Mon Sep 17 00:00:00 2001
From: Keith Davis <keith.davis@arm.com>
Date: Mon, 4 Nov 2019 08:58:33 +0000
Subject: IVGCVSW-3835 Create Encoder and Decoder for QSymm8PerAxis
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 * Add QuantizedSymm8PerAxis to armnn DataType (types.hpp) and
 * Add Quantize and Dequantize template for int8 in TypeUtils to be able to compute QSymm8 of the weight
 * Create PerAxisIterator for per-axis quantization
 * Create QSymm8PerAxisDecoder
 * Create QSymm8PerAxisEncoder

Signed-off-by: Keith Davis <keith.davis@arm.com>
Change-Id: Ibcfe0288a197b7ee50b543bdbd77b7edb8a547c2
---
 src/armnnUtils/TensorUtils.hpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'src/armnnUtils/TensorUtils.hpp')

diff --git a/src/armnnUtils/TensorUtils.hpp b/src/armnnUtils/TensorUtils.hpp
index 2b1f6a24f3..32af179bdc 100644
--- a/src/armnnUtils/TensorUtils.hpp
+++ b/src/armnnUtils/TensorUtils.hpp
@@ -7,6 +7,8 @@
 
 #include <armnn/TypesUtils.hpp>
 
+#include <boost/assert.hpp>
+
 namespace armnnUtils
 {
 armnn::TensorShape GetTensorShape(unsigned int numberOfBatches,
@@ -32,4 +34,32 @@ unsigned int GetNumElementsBetween(const armnn::TensorShape& shape,
 
 unsigned int GetUnsignedAxis(const unsigned int inputDimension, const int axis);
 
+inline unsigned int GetNumElementsAfter(const armnn::TensorShape& shape,
+                                        unsigned int axis)
+{
+    unsigned int numDim = shape.GetNumDimensions();
+    BOOST_ASSERT(0 >= axis);
+    BOOST_ASSERT(axis < numDim - 1);
+    unsigned int count = 1;
+    for (unsigned int i = axis; i < numDim; i++)
+    {
+        count *= shape[i];
+    }
+    return count;
+}
+
+inline std::pair<unsigned int, std::vector<float>> GetPerAxisParams(const armnn::TensorInfo& info)
+{
+    const std::vector<float>& scales = info.GetQuantizationScales();
+    armnn::Optional<unsigned int> quantizationDim = info.GetQuantizationDim();
+    if (scales.size() < 1 || !quantizationDim.has_value())
+    {
+        throw armnn::InvalidArgumentException(
+        "We currently support only per-axis symmetric quantization for QuantizedSymm8.");
+    }
+    unsigned int axisFactor = GetNumElementsAfter(info.GetShape(), quantizationDim.value());
+
+    return {axisFactor, scales};
+}
+
 } // namespace armnnUtils
-- 
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