Function smartnoise_runtime::utilities::mechanisms::simple_geometric_mechanism

pub fn simple_geometric_mechanism(
    value: i64, 
    epsilon: f64, 
    sensitivity: f64, 
    min: i64, 
    max: i64, 
    enforce_constant_time: bool
) -> Result<i64>

Returns noise drawn according to the Geometric mechanism.

Uses the Geometric mechanism as originally proposed in Ghosh, Roughgarden, & Sundarajan (2012). We are calling this the simple_geometric_mechanism because there is some hope that we will later add other versions, such as those developed in Balcer & Vadhan (2019)

Arguments

• value - Statistic to be privatized.
• epsilon - Multiplicative privacy loss parameter
• sensitivity - L1 sensitivity of function you want to privatize. The Geometric is typically used for counting queries, where sensitivity = 1.
• min - The minimum return you think possible.
• max - The maximum return you think possible.
• enforce_constant_time - Whether or not to run the noise generation algorithm in constant time. If true, will run max-min number of times.

Return

A draw according to the Geometric mechanism.

Examples

use smartnoise_runtime::utilities::mechanisms::simple_geometric_mechanism;
let n = simple_geometric_mechanism(4, 0.1, 1., 0, 10, true);