Compute Library
 21.05
InstrumentsStats.cpp
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24 #include "InstrumentsStats.h"
26 
27 namespace arm_compute
28 {
29 namespace test
30 {
31 namespace framework
32 {
33 InstrumentsStats::InstrumentsStats(const std::vector<Measurement> &measurements)
34  : _min(nullptr), _max(nullptr), _median(nullptr), _mean(measurements.begin()->value().is_floating_point), _stddev(0.0)
35 {
36  auto add_measurements = [](Measurement::Value a, const Measurement & b)
37  {
38  return a + b.value();
39  };
40 
41  //Calculate min, max & median values
42  auto indices = arm_compute::utility::sort_indices(measurements);
43  _median = &measurements[indices[measurements.size() / 2]];
44  _min = &measurements[indices[0]];
45  _max = &measurements[indices[measurements.size() - 1]];
46 
47  Measurement::Value sum_values = std::accumulate(measurements.begin(), measurements.end(), Measurement::Value(_min->value().is_floating_point), add_measurements);
48 
49  // Calculate the relative standard deviation
50  _mean = sum_values / measurements.size();
51  std::vector<Measurement::Value> diff(measurements.size(), _min->value().is_floating_point);
52  std::transform(measurements.begin(), measurements.end(), diff.begin(), [&](const Measurement & x)
53  {
54  return x.value() - _mean;
55  });
56  auto sq_sum = std::inner_product(diff.begin(), diff.end(), diff.begin(), Measurement::Value(_min->value().is_floating_point));
57  auto variance = sq_sum / measurements.size();
58  _stddev = Measurement::Value::relative_standard_deviation(variance, _mean);
59 }
60 } // namespace framework
61 } // namespace test
62 } // namespace arm_compute
static double relative_standard_deviation(const Value &variance, const Value &mean)
Get the relative standard deviation to a given distribution as a percentage.
Definition: Measurement.h:198
SimpleTensor< float > b
Definition: DFT.cpp:157
Generic measurement that stores values as either double or long long int.
Definition: Measurement.h:41
SimpleTensor< T2 > accumulate(const SimpleTensor< T1 > &src, DataType output_data_type)
Definition: Accumulate.cpp:38
Copyright (c) 2017-2021 Arm Limited.
InstrumentsStats(const std::vector< Measurement > &measurements)
Compute statistics for the passed set of measurements.
bool is_floating_point
Is the stored value floating point or integer ?
Definition: Measurement.h:216
const Value & value() const
Accessor for the stored value.
Definition: Measurement.h:301
std::vector< size_t > sort_indices(const std::vector< T > &v)
Perform an index sort of a given vector.
Definition: Utility.h:157