Struct PsroIterationStats 

pub struct PsroIterationStats {
    pub iteration: usize,
    pub population_size: usize,
    pub meta_nash_per_agent: Vec<Vec<f32>>,
    pub br_stats_per_agent: Vec<Option<JointStats>>,
    pub exploitability: f32,
}

Per-iteration PSRO statistics.

Fields

iteration: usize

Iteration index (1-based after the initial population is seeded).

population_size: usize

Population size at the end of this iteration (per agent; identical across agents under the symmetric posture).

meta_nash_per_agent: Vec<Vec<f32>>

Per-agent meta-Nash action-population marginal distributions at the end of this iteration. meta_nash_per_agent[i] is agent i’s marginal over its own population_size policies extracted from the joint α-rank distribution (for N≥3) or directly from the 2-player solver (for N=2).

br_stats_per_agent: Vec<Option<JointStats>>

Per-agent best-response training stats. br_stats_per_agent[i] is the stats for the round in which agent i was active under the round-robin schedule, or None if the agent was not the active agent on this iteration (currently every agent is trained every iteration, so every entry is Some).

exploitability: f32

NashConv-style exploitability: the sum over agents i of agent i’s maximum payoff improvement by deviating to a pure best response in the empirical game, given the joint meta-Nash distribution.

For N=2 zero-sum games this reduces to the original 2-player formula (row gain + column gain). Smaller is closer to the empirical equilibrium.

Implementations

impl PsroIterationStats

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

Backward-compat shim: agent 0 (row-player) meta-Nash distribution. Equivalent to &self.meta_nash_per_agent[0].

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

Backward-compat shim: agent 1 (column-player) meta-Nash distribution. Equivalent to &self.meta_nash_per_agent[1].

Trait Implementations

impl Clone for PsroIterationStats

fn clone(&self) -> PsroIterationStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PsroIterationStats

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

Formats the value using the given formatter.

impl Default for PsroIterationStats

fn default() -> PsroIterationStats

Returns the “default value” for a type.