Struct RunningMeanStd 

pub struct RunningMeanStd { /* private fields */ }

Running mean and standard deviation normalizer

Tracks mean and variance using Welford’s online algorithm for numerical stability.

Implementations

impl RunningMeanStd

pub fn new(size: usize, epsilon: f32) -> Self

Create a new normalizer

Arguments

• size - Dimension of observations
• epsilon - Small constant for numerical stability

pub fn update(&mut self, observations: &[Vec<f32>])

Update statistics with a batch of observations

Arguments

• observations - Batch of observations [batch_size][obs_dim]

pub fn normalize(&self, observations: &[f32]) -> Vec<f32>

Normalize observations

Arguments

• observations - Observations to normalize [obs_dim]

Returns

• Normalized observations (mean=0, std=1)

pub fn normalize_batch(&self, observations: &mut [Vec<f32>])

Normalize a batch of observations in-place

Arguments

• observations - Batch of observations [batch_size][obs_dim]

pub fn mean(&self) -> &[f32]

Get current mean

pub fn std(&self) -> Vec<f32>

Get current standard deviation

pub fn count(&self) -> f64

Get number of samples seen

Trait Implementations

impl Clone for RunningMeanStd

fn clone(&self) -> RunningMeanStd

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RunningMeanStd

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.