Function smartnoise_validator::components::snapping_mechanism::accuracy_to_epsilon

pub fn accuracy_to_epsilon(
    accuracy: f64, 
    alpha: f64, 
    sensitivity: f64, 
    b: f64
) -> Result<f64>

Finds epsilon that will achieve desired accuracy and confidence requirements. Described in https://github.com/opendp/smartnoise-core/blob/develop/whitepapers/mechanisms/snapping/snapping_implementation_notes.pdf

Note that not all accuracies have an epsilon, due to the clamping in the snapping mechanism. In these cases, accuracy is treated as an upper bound, and a larger epsilon is returned that guarantees a tighter accuracy.

Arguments

• accuracy - Desired accuracy level (upper bound).
• alpha - Desired confidence level.
• sensitivity - l1 Sensitivity of function to which mechanism is being applied.

Returns

Epsilon to use for the Snapping mechanism.