eval_toolkit.leakage

CrossSplitLeakageCheck	Train↔eval near-duplicate leakage (the genuinely dangerous one).
ExactDuplicateCheck	Within-split exact-duplicate detection.
GroupLeakageCheck	Group-id leakage: a single group spans multiple splits.
LabelConflictCheck	Cross-source label conflicts: same text, different labels across splits.
LeakageCheck	A pluggable validator over a dict of splits.
LeakageFinding	A single LeakageCheck's finding.
LeakageReport	Aggregate of one or more LeakageCheck results.
NearDuplicateCheck	Within-split near-duplicate detection via a pluggable similarity strategy.
NormalizedFormLeakageCheck	Encoding-obfuscated duplicate detection.
TemporalLeakageCheck	Temporal ordering invariant: every earlier split's max(time) ≤ next's min(time).
run_leakage_checks	Run a sequence of LeakageCheck over splits and aggregate.