pdstools.utils.cdh_utils

Helpers for working with Pega CDH-style data.

This package preserves the public surface of the previous cdh_utils module while splitting the implementation across several focused private submodules:

• _dates — Pega date-time parsing and start/end-date resolution.

• _namespacing — Pega field-name normalisation (_capitalize) and predictor-categorisation defaults.

• _polars — Polars expression / frame helpers (queries, sampling, schema casting, list-overlap utilities, weighted averages).

• _metrics — Performance metrics: AUC, lift, log-odds, gains tables and feature importance.

• _io — File, temp-directory, logger setup and version-check helpers.

• _misc — Small standalone helpers (list flattening, plot legend colors).

Submodule names are underscore-prefixed; only this __init__ is the supported import surface. Imports such as from pdstools.utils.cdh_utils import safe_int continue to resolve unchanged.