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Example<S> is the typed training/evaluation row for a signature S. 
use dspy_rs::{Example, Signature};

#[derive(Signature, Clone, Debug)]
struct QA {
    #[input]
    question: String,
    #[output]
    answer: String,
}

let row = Example::new(
    QAInput {
        question: "What is 2+2?".to_string(),
    },
    QAOutput {
        answer: "4".to_string(),
    },
);
Use Vec<Example<S>> for:
  • evaluate_trainset(...)
  • optimizer.compile::<S, _, _>(...)
For file/dataset ingestion, use DataLoader.