1 files changed, 99 insertions, 0 deletions
diff --git a/libs/misc/include/misc/fp32.h b/libs/misc/include/misc/fp32.h
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+++ b/libs/misc/include/misc/fp32.h
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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file     fp32.h
+ * @brief    This file contains functions to compare float values
+ * @ingroup  COM_AI_RUNTIME
+ */
+
+#ifndef __NNFW_MISC_FP32_H__
+#define __NNFW_MISC_FP32_H__
+
+#include <cmath>
+#include <cfloat>
+#include <algorithm>
+#include <cstdint>
+
+namespace nnfw
+{
+namespace misc
+{
+namespace fp32
+{
+
+/**
+ * @brief   Get the difference between two float values as a relative value.
+ * @param[in]   lhs   A float value to be compared
+ * @param[in]   rhs   A float value to be compared
+ * @return  A relative value of difference between two float values.
+ */
+inline float relative_diff(float lhs, float rhs)
+{
+  const auto diff = std::fabs(lhs - rhs);
+  const auto base = std::max(std::fabs(lhs), std::fabs(rhs));
+
+  return diff / base;
+}
+
+/**
+ * @brief   Verify that an obtained float value is equal to the expected float value
+ *          by using FLT_EPSILON
+ * @param[in]   expected   An expected float value to be compared
+ * @param[in]   obtained   An obtained float value to be compared
+ * @param[in]   tolerance  A tolerance value
+ * @return  @c true if both values are equal, otherwise @c false
+ */
+inline bool epsilon_equal(float expected, float obtained, uint32_t tolerance = 1)
+{
+  if (std::isnan(expected) && std::isnan(obtained))
+  {
+    return true;
+  }
+
+  // Let's use relative epsilon comparision
+  const auto diff = std::fabs(expected - obtained);
+  const auto max = std::max(std::fabs(expected), std::fabs(obtained));
+
+  return diff <= (max * FLT_EPSILON * tolerance);
+}
+
+/**
+ * @brief   Verify that an obtained float value is equal to the expected float value
+ *          by comparing absolute tolerance value
+ * @param[in]   expected   An expected float value to be compared
+ * @param[in]   obtained   An obtained float value to be compared
+ * @param[in]   tolerance  A tolerance value
+ * @return  @c true if both values are equal, otherwise @c false
+ */
+inline bool absolute_epsilon_equal(float expected, float obtained, float tolerance = 0.001)
+{
+  if (std::isnan(expected) && std::isnan(obtained))
+  {
+    return true;
+  }
+
+  // Let's use absolute epsilon comparision
+  const auto diff = std::fabs(expected - obtained);
+
+  return diff <= tolerance;
+}
+
+} // namespace fp32
+} // namespace misc
+} // namespace nnfw
+
+#endif // __NNFW_MISC_FP32_H__