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// SPDX-License-Identifier: GPL-3.0-or-later
#include "Config.h"
#include "Dimension.h"
#include "Query.h"
using namespace ml;
/*
* Copy of the unpack_storage_number which allows us to convert
* a storage_number to double.
*/
static CalculatedNumber unpack_storage_number_dbl(storage_number value) {
if(!value)
return 0;
int sign = 0, exp = 0;
int factor = 10;
// bit 32 = 0:positive, 1:negative
if(unlikely(value & (1 << 31)))
sign = 1;
// bit 31 = 0:divide, 1:multiply
if(unlikely(value & (1 << 30)))
exp = 1;
// bit 27 SN_EXISTS_100
if(unlikely(value & (1 << 26)))
factor = 100;
// bit 26 SN_EXISTS_RESET
// bit 25 SN_ANOMALY_BIT
// bit 30, 29, 28 = (multiplier or divider) 0-7 (8 total)
int mul = (value & ((1<<29)|(1<<28)|(1<<27))) >> 27;
// bit 24 to bit 1 = the value, so remove all other bits
value ^= value & ((1<<31)|(1<<30)|(1<<29)|(1<<28)|(1<<27)|(1<<26)|(1<<25)|(1<<24));
CalculatedNumber CN = value;
if(exp) {
for(; mul; mul--)
CN *= factor;
}
else {
for( ; mul ; mul--)
CN /= 10;
}
if(sign)
CN = -CN;
return CN;
}
std::pair<CalculatedNumber *, size_t>
TrainableDimension::getCalculatedNumbers() {
size_t MinN = Cfg.MinTrainSamples;
size_t MaxN = Cfg.MaxTrainSamples;
// Figure out what our time window should be.
time_t BeforeT = now_realtime_sec() - 1;
time_t AfterT = BeforeT - (MaxN * updateEvery());
BeforeT -= (BeforeT % updateEvery());
AfterT -= (AfterT % updateEvery());
BeforeT = std::min(BeforeT, latestTime());
AfterT = std::max(AfterT, oldestTime());
if (AfterT >= BeforeT)
return { nullptr, 0 };
CalculatedNumber *CNs = new CalculatedNumber[MaxN * (Cfg.LagN + 1)]();
// Start the query.
unsigned Idx = 0;
unsigned CollectedValues = 0;
unsigned TotalValues = 0;
CalculatedNumber LastValue = std::numeric_limits<CalculatedNumber>::quiet_NaN();
Query Q = Query(getRD());
Q.init(AfterT, BeforeT);
while (!Q.isFinished()) {
if (Idx == MaxN)
break;
auto P = Q.nextMetric();
storage_number SN = P.second;
if (does_storage_number_exist(SN)) {
CNs[Idx] = unpack_storage_number_dbl(SN);
LastValue = CNs[Idx];
CollectedValues++;
} else
CNs[Idx] = LastValue;
Idx++;
}
TotalValues = Idx;
if (CollectedValues < MinN) {
delete[] CNs;
return { nullptr, 0 };
}
// Find first non-NaN value.
for (Idx = 0; std::isnan(CNs[Idx]); Idx++, TotalValues--) { }
// Overwrite NaN values.
if (Idx != 0)
memmove(CNs, &CNs[Idx], sizeof(CalculatedNumber) * TotalValues);
return { CNs, TotalValues };
}
MLResult TrainableDimension::trainModel() {
auto P = getCalculatedNumbers();
CalculatedNumber *CNs = P.first;
unsigned N = P.second;
if (!CNs)
return MLResult::MissingData;
unsigned TargetNumSamples = Cfg.MaxTrainSamples * Cfg.RandomSamplingRatio;
double SamplingRatio = std::min(static_cast<double>(TargetNumSamples) / N, 1.0);
SamplesBuffer SB = SamplesBuffer(CNs, N, 1, Cfg.DiffN, Cfg.SmoothN, Cfg.LagN,
SamplingRatio, Cfg.RandomNums);
KM.train(SB, Cfg.MaxKMeansIters);
Trained = true;
ConstantModel = true;
delete[] CNs;
return MLResult::Success;
}
void PredictableDimension::addValue(CalculatedNumber Value, bool Exists) {
if (!Exists) {
CNs.clear();
return;
}
unsigned N = Cfg.DiffN + Cfg.SmoothN + Cfg.LagN;
if (CNs.size() < N) {
CNs.push_back(Value);
return;
}
std::rotate(std::begin(CNs), std::begin(CNs) + 1, std::end(CNs));
if (CNs[N - 1] != Value)
ConstantModel = false;
CNs[N - 1] = Value;
}
std::pair<MLResult, bool> PredictableDimension::predict() {
unsigned N = Cfg.DiffN + Cfg.SmoothN + Cfg.LagN;
if (CNs.size() != N)
return { MLResult::MissingData, AnomalyBit };
CalculatedNumber *TmpCNs = new CalculatedNumber[N * (Cfg.LagN + 1)]();
std::memcpy(TmpCNs, CNs.data(), N * sizeof(CalculatedNumber));
SamplesBuffer SB = SamplesBuffer(TmpCNs, N, 1, Cfg.DiffN, Cfg.SmoothN, Cfg.LagN,
1.0, Cfg.RandomNums);
AnomalyScore = computeAnomalyScore(SB);
delete[] TmpCNs;
if (AnomalyScore == std::numeric_limits<CalculatedNumber>::quiet_NaN())
return { MLResult::NaN, AnomalyBit };
AnomalyBit = AnomalyScore >= (100 * Cfg.DimensionAnomalyScoreThreshold);
return { MLResult::Success, AnomalyBit };
}
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