mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-23 17:15:31 +00:00
Code Activity

fix ema

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-05-05 13:58:47 +02:00
parent 43403fafcd
commit 13b54f379c
8 changed files with 103 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

22
src/util/ema.h
View file

@ -7,7 +7,9 @@ Module Name:
Abstract:
Exponential moving average in the style of CaDiCal.
Exponential moving average based on CaDiCal.
The exponential scheme used to adjust beta to alpha is
described in Biere & Froelich, POS (Pragmatics of SAT) 2016.
Author:
@ -22,17 +24,27 @@ Revision History:
class ema {
double m_alpha, m_beta, m_value;
unsigned m_period, m_wait;
bool invariant() const { return 0 <= m_alpha && m_alpha <= m_beta && m_beta <= 1; }
public:
ema() { memset(this, 0, sizeof(*this)); }
ema(): m_alpha(0), m_beta(1), m_value(0), m_period(0), m_wait(0) {
SASSERT(invariant());
}
ema(double alpha):
m_alpha(alpha), m_beta(1), m_value(0),
m_period(0), m_wait(0) {}
m_period(0), m_wait(0) {
SASSERT(invariant());
}
double operator() const { return m_value; }
void set_alpha(double alpha) {
m_alpha = alpha;
SASSERT(invariant());
}
operator double () const { return m_value; }
void update(double x) {
SASSERT(invariant());
m_value += m_beta * (x - m_value);
if (m_beta <= m_alpha || m_wait--) return;
m_wait = m_period = 2*(m_period + 1) - 1;