IVGCVSW-1898 : Ref backend folder structure

* Reference backend is renamed to backends/reference as per
  https://confluence.arm.com/display/MLENG/Pluggable+backends

Change-Id: I27a13c274eb60995dfb459e3c49c0e2f60bcd32c

1 files changed, 56 insertions, 0 deletions

diff --git a/src/backends/reference/workloads/BatchNormImpl.hpp b/src/backends/reference/workloads/BatchNormImpl.hpp
new file mode 100644
index 0000000000..a7579c8373
--- /dev/null
+++ b/src/backends/reference/workloads/BatchNormImpl.hpp
@@ -0,0 +1,56 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include "RefWorkloadUtils.hpp"
+
+#include <armnn/Tensor.hpp>
+
+#include <cmath>
+
+namespace armnn
+{
+
+template<typename NormData>
+static void BatchNormImpl(NormData data,
+                          const float* varIn,
+                          const float* meanIn,
+                          const float* gammaIn,
+                          const float* betaIn,
+                          float * outputData,
+                          const float * inputData)
+{
+    const TensorInfo& inputInfo0 = GetTensorInfo(data.m_Inputs[0]);
+    for (unsigned int c = 0; c < inputInfo0.GetShape()[1]; c++)
+    {
+        float var   = varIn[c];
+        float mean  = meanIn[c];
+        float gamma = gammaIn[c];
+        float beta  = betaIn[c];
+
+        float mult = gamma / sqrtf(var + data.m_Parameters.m_Eps);
+        float add  = beta - mult * mean;
+
+        for (unsigned int n = 0; n < inputInfo0.GetShape()[0]; n++)
+        {
+            for (unsigned int j = 0; j < inputInfo0.GetShape()[2]; j++)
+            {
+                for (unsigned int i = 0; i < inputInfo0.GetShape()[3]; i++)
+                {
+                    unsigned int index = i +
+                                         j*inputInfo0.GetShape()[3] +
+                                         c*inputInfo0.GetShape()[3] * inputInfo0.GetShape()[2] +
+                                         n*inputInfo0.GetShape()[3] * inputInfo0.GetShape()[2]
+                                                                     * inputInfo0.GetShape()[1];
+
+                    outputData[index] = mult * inputData[index] + add;
+                }
+            }
+        }
+    }
+}
+
+} //namespace armnn