Struct Ddm 

pub struct Ddm { /* private fields */ }

DDM (Drift Detection Method) for concept drift detection.

Monitors running error rate and standard deviation. Signals warning when error exceeds minimum by 2 sigma, drift at 3 sigma.

Implementations

impl Ddm

pub fn new() -> Self

Create a new DDM detector with default parameters.

Defaults: warning_level = 2.0, drift_level = 3.0, min_instances = 30.

pub fn with_params( warning_level: f64, drift_level: f64, min_instances: u64, ) -> Self

Create a DDM detector with custom parameters.

Arguments

• warning_level – multiplier of min_s above min_p_plus_s to trigger a warning (typically 2.0).
• drift_level – multiplier of min_s above min_p_plus_s to trigger drift (typically 3.0).
• min_instances – number of observations required before the detector can emit Warning or Drift signals.

pub fn warning_level(&self) -> f64

Return the current warning-level multiplier.

pub fn drift_level(&self) -> f64

Return the current drift-level multiplier.

pub fn min_instances(&self) -> u64

Return the minimum-instances warmup threshold.

pub fn std_dev(&self) -> f64

Current population standard deviation of the observed stream.

pub fn min_p_plus_s(&self) -> f64

Minimum mean + std observed so far.

impl Ddm

pub fn update(&mut self, value: f64) -> DriftSignal

Feed a new value and get the current drift signal.

This is the core algorithm, usable without the alloc feature. When alloc is enabled, the DriftDetector::update trait method delegates here.

pub fn reset(&mut self)

Reset to initial state.

pub fn estimated_mean(&self) -> f64

Current estimated mean of the monitored stream.

Trait Implementations

impl Clone for Ddm

fn clone(&self) -> Ddm

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Ddm

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

Formats the value using the given formatter.

impl Default for Ddm

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Ddm

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Ddm

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

Formats the value using the given formatter.

impl DriftDetector for Ddm

Available on crate feature alloc only.

fn update(&mut self, value: f64) -> DriftSignal

Feed a new value and get the current drift signal.

fn reset(&mut self)

Reset to initial state.

fn clone_fresh(&self) -> Box<dyn DriftDetector>

Create a fresh detector with the same configuration but no state.

fn clone_boxed(&self) -> Box<dyn DriftDetector>

Clone this detector including its internal state.

fn estimated_mean(&self) -> f64

Current estimated mean of the monitored stream.

fn serialize_state(&self) -> Option<DriftDetectorState>

Serialize the detector’s internal state for model persistence.

fn restore_state(&mut self, state: &DriftDetectorState) -> bool

Restore the detector’s internal state from a serialized snapshot.

impl Serialize for Ddm

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.