Struct RegionMdp

pub struct RegionMdp {
    transitions: HashMap<(u32, String), HashMap<u32, u32>>,
    rewards: HashMap<(u32, String), Vec<f32>>,
    region_quality: HashMap<u32, Vec<f32>>,
    n_transitions: usize,
}

A transition model over HNSW regions.

Fields

transitions: HashMap<(u32, String), HashMap<u32, u32>>

(region, action_type) → {next_region: count}.

rewards: HashMap<(u32, String), Vec<f32>>

(region, action_type) → [rewards].

region_quality: HashMap<u32, Vec<f32>>

region → [episode_rewards].

n_transitions: usize

Total transitions learned.

Implementations

impl RegionMdp

pub fn new() -> Self

Create an empty MDP.

pub fn learn_trajectory( &mut self, regions: &[u32], actions: &[String], reward: f32, )

Learn from a single episode trajectory.

regions: sequence of region IDs the episode traversed. actions: corresponding action types (same length as regions). reward: episode outcome (1.0 = success, 0.0 = failure).

pub fn action_success_rate(&self, region: u32, action_type: &str) -> f32

P(success | region, action_type) using Beta prior.

Returns (1 + n_successes) / (2 + n_total) for Bayesian smoothing. Falls back to region-level quality if no data for this (region, action).

pub fn region_quality_score(&self, region: u32) -> f32

Overall quality of a region (mean reward of episodes passing through).

pub fn best_actions(&self, region: u32) -> Vec<(String, f32)>

Rank action types by success rate in a given region.

Returns (action_type, success_rate) sorted descending.

pub fn transition_probability( &self, region: u32, action: &str, next_region: u32, ) -> f32

P(s’ | s, a) — transition probability.

pub fn decay_factor(&self, region: u32) -> f32

Context-aware decay factor based on region quality.

High-quality region → small decay (0.95). Low-quality region → large decay (0.70).

pub fn format_hints(&self, region: u32, top_n: usize) -> String

Format action hints for a region as a string.

pub fn n_transitions(&self) -> usize

Total transitions learned.

pub fn n_state_actions(&self) -> usize

Number of distinct (region, action) pairs observed.

pub fn n_regions(&self) -> usize

Number of distinct regions observed.

pub fn stats(&self) -> String

Summary statistics.

Trait Implementations

impl Clone for RegionMdp

fn clone(&self) -> RegionMdp

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RegionMdp

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

Formats the value using the given formatter.

impl Default for RegionMdp

fn default() -> RegionMdp

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for RegionMdp

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for RegionMdp

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

where __S: Serializer,

Serialize this value into the given Serde serializer.