IVGCVSW-5435 Add FloatingPointComparison to remove boost::math::fpc uses

 * Added FloatingPointComparison.hpp and FloatingPointComparisonTest.cpp,
   which compares two floats and returns true if the values are
   within a specified or default tolerance of each other.
 * Also removed boost::math::fpc from test/TensorHelpers.hpp to validate.

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I164c32eccd213c53bb1bc4f9cd4ee4838f1781c9

1 files changed, 27 insertions, 0 deletions

diff --git a/include/armnnUtils/FloatingPointComparison.hpp b/include/armnnUtils/FloatingPointComparison.hpp
new file mode 100644
index 0000000000..1e7b15a982
--- /dev/null
+++ b/include/armnnUtils/FloatingPointComparison.hpp
@@ -0,0 +1,27 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <cmath>
+
+namespace armnnUtils
+{
+
+/**
+ * Compare two floats and return true if their values are within a specified tolerance of each other.
+ * @param a
+ * @param b
+ * @param tolerancePercentage If not supplied default will be 1% tolerance (1.0f)
+ * @return true if the value of float b is within tolerancePercentage of the value for float a.
+ */
+inline bool within_percentage_tolerance(float a, float b, float tolerancePercent = 1.0f)
+{
+    float toleranceValue = std::fabs(a * (tolerancePercent / 100));
+    return std::fabs(a - b) <= toleranceValue;
+}
+
+} //namespace armnn
+