/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
+ Copyright (C) 2004-2022 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
class RunningAverage {
public:
- // Constructor
- RunningAverage() {}
-
// Reset the running average to rational value p / q
void set(int64_t p, int64_t q)
{ average = p * PERIOD * RESOLUTION / q; }
{ average = RESOLUTION * v + (PERIOD - 1) * average / PERIOD; }
// Test if average is strictly greater than rational a / b
- bool is_greater(int64_t a, int64_t b)
- { return b * average > a * PERIOD * RESOLUTION ; }
+ bool is_greater(int64_t a, int64_t b) const
+ { return b * average > a * (PERIOD * RESOLUTION); }
+
+ int64_t value() const
+ { return average / (PERIOD * RESOLUTION); }
private :
static constexpr int64_t PERIOD = 4096;
public:
std::size_t size() const { return size_; }
- void resize(std::size_t newSize) { size_ = newSize; }
void push_back(const T& value) { values_[size_++] = value; }
- T& operator[](std::size_t index) { return values_[index]; }
- T* begin() { return values_; }
- T* end() { return values_ + size_; }
- const T& operator[](std::size_t index) const { return values_[index]; }
const T* begin() const { return values_; }
const T* end() const { return values_ + size_; }
- void swap(ValueList& other) {
- const std::size_t maxSize = std::max(size_, other.size_);
- for (std::size_t i = 0; i < maxSize; ++i) {
- std::swap(values_[i], other.values_[i]);
- }
- std::swap(size_, other.size_);
- }
-
private:
T values_[MaxSize];
std::size_t size_ = 0;
/// - the slope can be adjusted using C > 0, smaller C giving a steeper sigmoid
/// - the slope of the sigmoid when t = x0 is P/(Q*C)
/// - sigmoid is increasing with t when P > 0 and Q > 0
-/// - to get a decreasing sigmoid, call with -t, or change sign of P
+/// - to get a decreasing sigmoid, change sign of P
/// - mean value of the sigmoid is y0
///
/// Use <https://www.desmos.com/calculator/jhh83sqq92> to draw the sigmoid
int64_t Q)
{
assert(C > 0);
+ assert(Q != 0);
return y0 + P * (t-x0) / (Q * (std::abs(t-x0) + C)) ;
}