Function eval_ext_expr 

pub fn eval_ext_expr<F, EF>(
    expr: &SymbolicExpressionExt<F, EF>,
    inputs: &[EF],
    layout: &InputLayout,
    periodic_values: &[EF],
) -> EF
where
    F: Field,
    EF: ExtensionField<F>,

Evaluate an extension-field symbolic expression at concrete inputs.