MLECO-2599: Replace DSCNN with MicroNet for KWS

Added SoftMax function to Mathutils to allow MicroNet
to output probability as it does not nativelu have this layer.
Minor refactoring to accommodate Softmax Calculations
Extensive renaming and updating of documentation and resource download script.
Added SoftMax function to Mathutils to allow MicroNet
to output probability.

Change-Id: I7cbbda1024d14b85c9ac1beea7ca8fbffd0b6eb5
Signed-off-by: Liam Barry <liam.barry@arm.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/source/application/main/PlatformMath.cc b/source/application/main/PlatformMath.cc
index 0b8882a..26b4b72 100644
--- a/source/application/main/PlatformMath.cc
+++ b/source/application/main/PlatformMath.cc
@@ -15,6 +15,8 @@
  * limitations under the License.
  */
 #include "PlatformMath.hpp"
+#include <algorithm>
+#include <numeric>
 
 #if 0 == ARM_DSP_AVAILABLE
     #include <cmath>
@@ -290,6 +292,24 @@ namespace math {
         return true;
     }
 
+    void MathUtils::SoftmaxF32(std::vector<float>& vec)
+    {
+        /* Fix for numerical stability and apply exp. */
+        auto start = vec.begin();
+        auto end = vec.end();
+
+        float maxValue = *std::max_element(start, end);
+        for (auto it = start; it != end; ++it) {
+            *it = std::exp((*it) - maxValue);
+        }
+
+        float sumExp = std::accumulate(start, end, 0.0f);
+
+        for (auto it = start; it != end; ++it) {
+            *it = (*it)/sumExp;
+        }
+    }
+
 } /* namespace math */
 } /* namespace app */
 } /* namespace arm */