Struct ModelMetadata 

pub struct ModelMetadata {
    pub version: String,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
    pub model_type: String,
    pub num_features: usize,
    pub num_trees: usize,
    pub parameters: HashMap<String, String>,
}

Re-exported serialization utilities.

This includes model persistence with versioning, metadata tracking, and support for multiple serialization formats. Metadata describing a serialized model.

Tracks versioning, creation info, and model characteristics to ensure reproducibility and compatibility.

Fields

version: String

Semantic version of the library that created the model.

created_at: DateTime<Utc>

Timestamp when the model was first saved.

updated_at: DateTime<Utc>

Timestamp when the model was last updated.

model_type: String

Type of model (e.g., “gradient_booster”, “decision_tree”).

num_features: usize

Number of features the model expects.

num_trees: usize

Number of trees in the ensemble (if applicable).

parameters: HashMap<String, String>

Model hyperparameters and configuration.

Implementations

impl ModelMetadata

pub fn new(model_type: &str, num_features: usize, num_trees: usize) -> Self

Creates new metadata for a model.

Automatically sets version to current crate version and timestamps to now.

Arguments

• model_type - Identifier for the model type
• num_features - Number of input features
• num_trees - Number of trees (0 for single models)

pub fn with_parameter(self, key: &str, value: &str) -> Self

Adds a hyperparameter to the metadata (builder pattern).

Arguments

• key - Parameter name
• value - Parameter value (converted to string)

Returns

Self with updated parameters

pub fn update(&mut self)

Updates the updated_at timestamp to current time.

pub fn validate_version(&self) -> SerializationResult<()>

Validates that the model version matches the current library version.

Returns

Ok(()) if versions match, Err(SerializationError::VersionMismatch) otherwise

Trait Implementations

impl Clone for ModelMetadata

fn clone(&self) -> ModelMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModelMetadata

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ModelMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ModelMetadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.