1 /*
2 * Copyright (c) 2017-2018 Arm Limited.
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24 #include "MeanStdDev.h"
25
26 namespace arm_compute
27 {
28 namespace test
29 {
30 namespace validation
31 {
32 namespace reference
33 {
34 template <typename T>
mean_and_standard_deviation(const SimpleTensor<T> & in)35 std::pair<float, float> mean_and_standard_deviation(const SimpleTensor<T> &in)
36 {
37 const int num_elements = in.num_elements();
38
39 // Calculate mean
40 float mean = std::accumulate(in.data(), in.data() + num_elements, 0.f) / num_elements;
41
42 // Calculate standard deviation
43 float std_dev = std::accumulate(in.data(), in.data() + num_elements, 0.f, [&mean](float a, float b)
44 {
45 return a + (mean - b) * (mean - b);
46 });
47
48 std_dev = std::sqrt(std_dev / num_elements);
49
50 return std::make_pair(mean, std_dev);
51 }
52
53 template std::pair<float, float> mean_and_standard_deviation(const SimpleTensor<uint8_t> &in);
54 template std::pair<float, float> mean_and_standard_deviation(const SimpleTensor<half> &in);
55 template std::pair<float, float> mean_and_standard_deviation(const SimpleTensor<float> &in);
56 } // namespace reference
57 } // namespace validation
58 } // namespace test
59 } // namespace arm_compute
60