Struct LengthBasedExampleSelector

pub struct LengthBasedExampleSelector {
    pub examples: Vec<Example>,
    pub get_text_length: fn(&str) -> usize,
    pub max_length: usize,
    pub example_text_lengths: Vec<usize>,
}

Select examples based on length.

This selector chooses examples that fit within a maximum length constraint, making it useful for managing prompt size and token limits.

Fields

examples: Vec<Example>

A list of the examples that the prompt template expects

get_text_length: fn(&str) -> usize

Function to measure text length. Defaults to word count.

max_length: usize

Max length for the prompt, beyond which examples are cut

example_text_lengths: Vec<usize>

Length of each example (cached for performance)

Implementations

impl LengthBasedExampleSelector

pub fn new( examples: Vec<Example>, max_length: usize, get_text_length: Option<fn(&str) -> usize>, ) -> Self

Create a new length-based example selector.

Arguments

• examples - Initial list of examples
• max_length - Maximum total length for selected examples
• get_text_length - Function to measure text length (defaults to word count)

pub fn with_word_count(examples: Vec<Example>, max_length: usize) -> Self

Create a new selector with default word count function.

pub fn with_char_count(examples: Vec<Example>, max_length: usize) -> Self

Create a new selector with character count function.

pub fn default_text_length(text: &str) -> usize

Default text length function (word count).

pub fn char_length(text: &str) -> usize

Character count function.

pub fn total_length(&self) -> usize

Get the current total length of examples.

pub fn len(&self) -> usize

Get the number of examples.

pub fn is_empty(&self) -> bool

Check if the selector is empty.

Trait Implementations

impl BaseExampleSelector for LengthBasedExampleSelector

fn add_example(&mut self, example: Example) -> Result<()>

Add a new example to the store.

fn select_examples(&self, input_variables: &Example) -> Result<Vec<Example>>

Select which examples to use based on the inputs.

fn aadd_example<'life0, 'async_trait>( &'life0 mut self, example: Example, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Async add a new example to the store.

fn aselect_examples<'life0, 'life1, 'async_trait>( &'life0 self, input_variables: &'life1 Example, ) -> Pin<Box<dyn Future<Output = Result<Vec<Example>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Async select which examples to use based on the inputs.

impl Clone for LengthBasedExampleSelector

fn clone(&self) -> LengthBasedExampleSelector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LengthBasedExampleSelector

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LengthBasedExampleSelector

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serializable for LengthBasedExampleSelector

fn namespace() -> Vec<String>

Get the namespace for this serializable object

fn is_serializable() -> bool

Check if this object is serializable

fn to_json(&self) -> Result<String>

Serialize this object to JSON

fn to_json_pretty(&self) -> Result<String>

Serialize this object to a pretty-printed JSON string

fn from_json(json: &str) -> Result<Self>

where Self: Sized,

Deserialize this object from JSON

fn to_dict(&self) -> Result<HashMap<String, Value>>

Serialize this object to a dictionary (HashMap)

fn from_dict(dict: &HashMap<String, Value>) -> Result<Self>

where Self: Sized,

Deserialize this object from a dictionary (HashMap)

fn type_name() -> &'static str

Get the type name for this serializable object

impl Serialize for LengthBasedExampleSelector

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

where __S: Serializer,

Serialize this value into the given Serde serializer.