Struct ArmStats 

pub struct ArmStats {
    pub pulls: u64,
    pub total_reward: f64,
    pub mean_reward: f64,
}

Available on crate feature bandit only.

A snapshot of a single arm’s statistics.

Produced by Bandit::arm_stats for diagnostics. All fields are plain values — this struct does not borrow from the bandit.

Fields

pulls: u64

How many times this arm has been pulled.

total_reward: f64

The total reward accumulated by this arm.

mean_reward: f64

The mean reward of this arm (total_reward / pulls), or 0.0 if the arm has never been pulled.

Implementations

impl ArmStats

pub const fn empty() -> Self

Create a new ArmStats for an arm that has never been pulled.

pub fn new(pulls: u64, total_reward: f64) -> Result<Self, RillError>

Create a new ArmStats from raw per-arm data.

If pulls is zero, mean_reward is set to 0.0.

Trait Implementations

impl Clone for ArmStats

fn clone(&self) -> ArmStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ArmStats

impl Debug for ArmStats

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

Formats the value using the given formatter.

impl Default for ArmStats

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for ArmStats

fn eq(&self, other: &ArmStats) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ArmStats