Struct ObjectiveFactory

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pub struct ObjectiveFactory;

Expand description

Factory for creating objective function instances.

ObjectiveFactory provides static methods to instantiate objective functions with appropriate types and parameters. It handles validation and configuration of objective-specific hyperparameters.

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impl ObjectiveFactory

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pub fn create_regression_objective( name: &str, ) -> ObjectiveResult<Box<dyn RegressionObjective>>

Creates a regression objective function by name.

§Supported Names

mse, mean_squared_error
mae, mean_absolute_error
huber (creates with delta=1.0)

§Parameters

name: Objective function name (case-insensitive)

§Returns

Boxed trait object implementing RegressionObjective

§Errors

ObjectiveError::ConfigError if name is not a valid regression objective

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pub fn create_binary_classification_objective( name: &str, ) -> ObjectiveResult<Box<dyn BinaryClassificationObjective>>

Creates a binary classification objective function by name.

§Supported Names

log_loss, binary_crossentropy, binary_cross_entropy

§Parameters

name: Objective function name (case-insensitive)

§Returns

Boxed trait object implementing BinaryClassificationObjective

§Errors

ObjectiveError::ConfigError if name is not a valid classification objective

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pub fn create_objective_from_config( config: &ObjectiveConfig, ) -> ObjectiveResult<Box<dyn Objective>>

Creates an objective from a configuration struct.

§Parameters

config: ObjectiveConfig with name and parameters

§Returns

Boxed trait object implementing Objective

§Supported Configurations

mse: No parameters
mae: No parameters
huber: delta parameter (default: 1.0)
log_loss: epsilon parameter (default: 1e-15)

§Errors

ObjectiveError::ConfigError if objective name is unknown
ObjectiveError::ConfigError if parameters are invalid

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pub fn get_objective_type(name: &str) -> ObjectiveResult<ObjectiveType>

Determines the task type for a given objective name.

§Parameters

name: Objective name (case-insensitive)

§Returns

ObjectiveType indicating regression or classification

§Errors

ObjectiveError::ConfigError if objective name is unknown

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pub fn available_objectives() -> Vec<&'static str>

Returns a list of all available objective names.

§Returns

Vector of lowercase objective names

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pub fn get_default_params(name: &str) -> ObjectiveResult<HashMap<String, f64>>

Gets default parameters for an objective.

§Parameters

name: Objective name (case-insensitive)

§Returns

HashMap of parameter names to default values

§Errors

ObjectiveError::ConfigError if objective name is unknown

Auto Trait Implementations§

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impl UnwindSafe for ObjectiveFactory

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where T: 'static + ?Sized,

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