Enum FactoryError 

#[non_exhaustive]
pub enum FactoryError {
    InvalidConfig(ConfigError),
    IncompatibleArm {
        reason: String,
    },
}

Error returned by crate::automl::ModelFactory::create.

The AutoML bandit may sample hyperparameter combinations that are structurally invalid (e.g. n_heads > d_model, non-divisible group sizes, or out-of-range floats that slip past the config-space bounds). Rather than panicking, factories return this error and the racing layer logs a warning and skips the offending arm.

The enum is #[non_exhaustive] so that future variants (e.g. a ResourceLimit variant once budget accounting lands) do not become breaking changes for external users implementing the trait.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

InvalidConfig(ConfigError)

A config builder’s validation step failed.

This is the most common case: a sampled float or integer was in the ConfigSpace bounds but violates a model-level constraint (e.g. forgetting_factor must be strictly < 1.0, n_steps must be > 0).

IncompatibleArm

Two or more sampled parameters are jointly invalid.

Used when the conflict cannot be expressed as a single-field ConfigError — for example, n_heads > d_model (neither field is individually out of range, but their combination is illegal).

Fields

reason: String

Human-readable explanation of why this arm is incompatible.

Trait Implementations

impl Debug for FactoryError

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

Formats the value using the given formatter.

impl Display for FactoryError

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

Formats the value using the given formatter.

impl Error for FactoryError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<ConfigError> for FactoryError

fn from(e: ConfigError) -> Self

Converts to this type from the input type.

impl From<IrithyllError> for FactoryError

fn from(e: IrithyllError) -> Self

Converts to this type from the input type.