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Add samples sum calculation

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Bug: b/261160916, webrtc:14852
Change-Id: I88e464fce4673dd9b9683219b8d2837206579ba5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/293942
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39386}
This commit is contained in:
Sergey Silkin 2023-02-17 15:05:41 +01:00 committed by WebRTC LUCI CQ
parent cec856991b
commit 8566e779e3
4 changed files with 18 additions and 0 deletions
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6
api/numerics/samples_stats_counter.h
View file

@ -65,6 +65,12 @@ class SamplesStatsCounter {
RTC_DCHECK(!IsEmpty());
return *stats_.GetMax();
}
// Returns sum in O(1) time. This function may not be called if there are
// no samples.
double GetSum() const {
RTC_DCHECK(!IsEmpty());
return *stats_.GetSum();
}
// Returns average in O(1) time. This function may not be called if there are
// no samples.
double GetAverage() const {

1
api/numerics/samples_stats_counter_unittest.cc
View file

@ -61,6 +61,7 @@ TEST(SamplesStatsCounterTest, FullSimpleTest) {
EXPECT_TRUE(!stats.IsEmpty());
EXPECT_DOUBLE_EQ(stats.GetMin(), 1.0);
EXPECT_DOUBLE_EQ(stats.GetMax(), 100.0);
EXPECT_DOUBLE_EQ(stats.GetSum(), 5050.0);
EXPECT_NEAR(stats.GetAverage(), 50.5, 1e-6);
for (int i = 1; i <= 100; i++) {
double p = i / 100.0;

10
rtc_base/numerics/running_statistics.h
View file

@ -51,6 +51,7 @@ class RunningStatistics {
void AddSample(T sample) {
max_ = std::max(max_, sample);
min_ = std::min(min_, sample);
sum_ += sample;
++size_;
// Welford's incremental update.
const double delta = sample - mean_;
@ -123,6 +124,14 @@ class RunningStatistics {
return max_;
}
// Returns sum in O(1) time.
absl::optional<double> GetSum() const {
if (size_ == 0) {
return absl::nullopt;
}
return sum_;
}
// Returns mean in O(1) time.
absl::optional<double> GetMean() const {
if (size_ == 0) {
@ -153,6 +162,7 @@ class RunningStatistics {
T max_ = minus_infinity_or_min<T>();
double mean_ = 0;
double cumul_ = 0; // Variance * size_, sometimes noted m2.
double sum_ = 0;
};
} // namespace webrtc_impl

1
rtc_base/numerics/running_statistics_unittest.cc
View file

@ -61,6 +61,7 @@ TEST(RunningStatistics, FullSimpleTest) {
EXPECT_DOUBLE_EQ(*stats.GetMin(), 1.0);
EXPECT_DOUBLE_EQ(*stats.GetMax(), 100.0);
EXPECT_DOUBLE_EQ(*stats.GetSum(), 5050.0);
// EXPECT_DOUBLE_EQ is too strict (max 4 ULP) for this one.
ASSERT_NEAR(*stats.GetMean(), 50.5, 1e-10);
}