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

2 files changed, 139 insertions, 3 deletions

diff --git a/src/armnn/test/TensorHelpers.hpp b/src/armnn/test/TensorHelpers.hpp
index d67cd5b979..fd9dd83770 100644
--- a/src/armnn/test/TensorHelpers.hpp
+++ b/src/armnn/test/TensorHelpers.hpp
@@ -6,13 +6,13 @@
 
 #include <armnn/Tensor.hpp>
 #include <armnn/utility/Assert.hpp>
+#include <armnnUtils/FloatingPointComparison.hpp>
 
 #include <QuantizeHelper.hpp>
 
 #include <boost/multi_array.hpp>
 #include <boost/random/uniform_real_distribution.hpp>
 #include <boost/random/mersenne_twister.hpp>
-#include <boost/test/tools/floating_point_comparison.hpp>
 #include <boost/test/unit_test.hpp>
 
 #include <array>
@@ -53,8 +53,7 @@ struct SelectiveComparer<T, false>
         }
 
         // For unquantized floats we use a tolerance of 1%.
-        boost::math::fpc::close_at_tolerance<float> comparer(boost::math::fpc::percent_tolerance(1.0f));
-        return comparer(a, b);
+        return armnnUtils::within_percentage_tolerance(a, b);
     }
 };
 
diff --git a/src/armnnUtils/test/FloatingPointComparisonTest.cpp b/src/armnnUtils/test/FloatingPointComparisonTest.cpp
new file mode 100644
index 0000000000..dab0deb5e6
--- /dev/null
+++ b/src/armnnUtils/test/FloatingPointComparisonTest.cpp
@@ -0,0 +1,137 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include <armnnUtils/FloatingPointComparison.hpp>
+
+#include <boost/test/unit_test.hpp>
+
+using namespace armnnUtils;
+
+BOOST_AUTO_TEST_SUITE(FloatingPointComparisonSuite)
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonDefaultTolerance)
+{
+    // 1% range of 1.2 is 1.188 -> 1.212
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(1.2f, 1.17f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(1.2f, 1.213f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.189f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.210f));
+    // Exact match
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.2f));
+
+    // Negative value tests.
+    BOOST_TEST(!within_percentage_tolerance(-1.2f, -1.17f));
+    BOOST_TEST(!within_percentage_tolerance(-1.2f, -1.213f));
+    BOOST_TEST(within_percentage_tolerance(-1.2f, -1.189f));
+    BOOST_TEST(within_percentage_tolerance(-1.2f, -1.210f));
+    BOOST_TEST(within_percentage_tolerance(-1.2f, -1.2f));
+
+    // Negative & positive tests
+    BOOST_TEST(!within_percentage_tolerance(1.2f, -1.2f));
+    BOOST_TEST(!within_percentage_tolerance(-1.2f, 1.2f));
+
+    // Negative and positive test with large float values.
+    BOOST_TEST(!within_percentage_tolerance(3.3E+38f, -1.17549435e38f));
+    BOOST_TEST(!within_percentage_tolerance(-1.17549435e38f, 3.3E+38f));
+
+    // 1% range of 0.04 is 0.0396 -> 0.0404
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(0.04f, 0.039f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(0.04f, 0.04041f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(0.04f, 0.0397f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(0.04f, 0.04039f));
+    // Exact match
+    BOOST_TEST(within_percentage_tolerance(0.04f, 0.04f));
+}
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonLargePositiveNumbersDefaultTolerance)
+{
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(3.3E+38f, (3.3E+38f * 0.989f)));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(3.3E+38f, (3.3E+38f * 1.011f)));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(3.3E+38f, (3.3E+38f * 0.992f)));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(3.3E+38f, (3.3E+38f * 1.009f)));
+    // Exact match
+    BOOST_TEST(within_percentage_tolerance(3.3E+38f, 3.3E+38f));
+}
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonLargeNegativeNumbersDefaultTolerance)
+{
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(-1.17549435e38f, (-1.17549435e38f * -1.009f)));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(-1.17549435e38f, (-1.17549435e38f * 1.011f)));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(-1.17549435e38f, -1.17549435e38f - (-1.17549435e38f * 0.0099f)));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(-1.17549435e38f, -1.17549435e38f + (-1.17549435e38f * 0.0099f)));
+    // Exact match
+    BOOST_TEST(within_percentage_tolerance(-1.17549435e38f, -1.17549435e38f));
+}
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonSpecifiedTolerance)
+{
+    // 2% range of 1.2 is 1.176 -> 1.224
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(1.2f, 1.175f, 2.0f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(1.2f, 1.226f, 2.0f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.18f, 2.0f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.22f, 2.0f));
+    // Exact match.
+    BOOST_TEST(within_percentage_tolerance(1.2f, 1.2f, 2.0f));
+
+    // 5% range of 6.2 is 5.89 -> 6.51
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(6.2f, 5.88f, 5.0f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(6.2f, 6.52f, 5.0f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(6.2f, 5.9f, 5.0f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(6.2f, 6.5f, 5.0f));
+
+    // Larger tolerance (unlikely to be used).
+    BOOST_TEST(within_percentage_tolerance(10.0f, 9.01f, 10.0f));
+    BOOST_TEST(!within_percentage_tolerance(10.0f, 8.99f, 10.0f));
+}
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonLargePositiveNumbersSpecifiedTolerance)
+{
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(3.3E+38f, (3.3E+38f * 0.979f), 2.0f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(3.3E+38f, (3.3E+38f * 1.021f), 2.0f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(3.3E+38f, (3.3E+38f * 0.982f), 2.0f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(3.3E+38f, (3.3E+38f * 1.019f), 2.0f));
+}
+
+BOOST_AUTO_TEST_CASE(FloatingPointComparisonLargeNegativeNumbersSpecifiedTolerance)
+{
+    // Just below tolerance.
+    BOOST_TEST(!within_percentage_tolerance(-1.17549435e38f, (-1.17549435e38f * -1.019f), 2.0f));
+    // Just above tolerance.
+    BOOST_TEST(!within_percentage_tolerance(-1.17549435e38f, (-1.17549435e38f * 1.021f), 2.0f));
+    // Just inside the lower range.
+    BOOST_TEST(within_percentage_tolerance(-1.17549435e38f, -1.17549435e38f - (-1.17549435e38f * 0.0089f), 2.0f));
+    // Just inside the upper range.
+    BOOST_TEST(within_percentage_tolerance(-1.17549435e38f, -1.17549435e38f + (-1.17549435e38f * 0.0089f), 2.0f));
+}
+
+BOOST_AUTO_TEST_SUITE_END()