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Fix incorrect gdp_sigma for one-way marginals in MST mechanism #22

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Fix incorrect gdp_sigma for one-way marginals in MST mechanism #22

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4 changes: 3 additions & 1 deletion dpsynth/discrete_mechanisms/mst.py
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Original file line number Diff line number Diff line change
Expand Up @@ -199,10 +199,12 @@ def run_mechanism(
np.random.seed(config.seed)
if initial_measurements is None:
budget_remaining -= config.one_way_budget_fraction * zcdp_rho
one_way_rho = zcdp_rho * config.one_way_budget_fraction
one_way_sigma = accounting.zcdp_gaussian_sigma(one_way_rho)
one_way_measurements = common.measure_marginals_with_noise(
data,
marginal_queries=[(a,) for a in data.domain],
gdp_sigma=zcdp_rho * config.one_way_budget_fraction,
gdp_sigma=one_way_sigma,
)
else:
one_way_measurements = initial_measurements
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