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Update imbalance calculation.

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This commit is contained in:
FiveMovesAhead 2025-10-06 10:54:54 +01:00
parent 255bdd5e47
commit 2149bf6790
1 changed files with 13 additions and 10 deletions
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23
tig-protocol/src/contracts/opow.rs
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@ -460,20 +460,23 @@ pub(crate) async fn update(cache: &mut AddBlockCache) {
.zip(factor_weights.iter())
.map(|(x, w)| x * w)
.sum::<PreciseNumber>();
let average_factor = factors.arithmetic_mean();
let variance = factors
let weighted_variance_factor = factors
.iter()
.map(|x| x - average_factor)
.map(|x| x * x)
.sum::<PreciseNumber>()
/ PreciseNumber::from(factors.len() as u64);
let cv_sqr = if average_factor == zero {
.zip(factor_weights.iter())
.map(|(x, w)| {
let diff = if x > weighted_average_factor {
x - weighted_average_factor
} else {
weighted_average_factor - x
};
diff * diff * w
})
.sum::<PreciseNumber>();
let imbalance = if weighted_average_factor == zero || weighted_average_factor == one {
zero.clone()
} else {
variance / (average_factor * average_factor)
weighted_variance_factor / (weighted_average_factor * (one - weighted_average_factor))
};
let imbalance = cv_sqr / (num_factors - one);
weights.push(
weighted_average_factor
* PreciseNumber::approx_inv_exp(imbalance_multiplier * imbalance),