Change DPQuantiles natural parameter from zcdp_rho to epsilon_levels#19
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Change DPQuantiles natural parameter from zcdp_rho to epsilon_levels#19copybara-service[bot] wants to merge 1 commit into
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Replace the single `zcdp_rho` field with `epsilon_levels: Sequence[float]`, making the per-level exponential mechanism epsilons the explicit natural parameters. This allows users to set custom per-level epsilon schedules directly, or use `calibrate()` to derive them from a zCDP budget. The `calibrate` method gains an `epsilon_ratio` keyword argument (default 2.0) controlling how aggressively the budget shifts toward deeper tree levels. A ratio of 2 doubles epsilon per level, preserving the signal-to-noise ratio as data is halved at each split. A ratio of 1 gives uniform epsilon across all levels. The internal `_quantile_epsilon_levels` helper is generalized accordingly, replacing the hardcoded ratio-4 rho scaling with `epsilon_ratio**2`. PiperOrigin-RevId: 932620196
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Change DPQuantiles natural parameter from zcdp_rho to epsilon_levels
Replace the single
zcdp_rhofield withepsilon_levels: Sequence[float],making the per-level exponential mechanism epsilons the explicit natural
parameters. This allows users to set custom per-level epsilon schedules
directly, or use
calibrate()to derive them from a zCDP budget.The
calibratemethod gains anepsilon_ratiokeyword argument (default2.0) controlling how aggressively the budget shifts toward deeper tree
levels. A ratio of 2 doubles epsilon per level, preserving the
signal-to-noise ratio as data is halved at each split. A ratio of 1 gives
uniform epsilon across all levels.
The internal
_quantile_epsilon_levelshelper is generalized accordingly,replacing the hardcoded ratio-4 rho scaling with
epsilon_ratio**2.