2 Commits

Author	SHA1	Message	Date
张宗平	0723b257fd	fix(m1): _random_window fallback could return end < start ... Root cause (found during 50k sample generation at seed 6975, surfacing as 'ValueError: Number of samples, -187, must be non-negative' from linspace in _inject_drift): _random_window's best-effort fallback after 50 failed non-overlap attempts drew start and end from TWO INDEPENDENT random integers, so end could be < start. The primary loop was consistent (start, start+length). Fix: reuse the same start in the fallback so end >= start always holds (overlap is still allowed in best-effort, just no inversion). - tests/test_synthesis.py: regression sweeping 300 seeds × 4 type combos, asserting every segment's end >= start. 146 tests passing.	2026-06-30 03:22:18 +00:00
张宗平	e2c0756a78	feat(m1): synthesis — components + anomaly/event/missing (T1.3) ... - generate_series: baseline + trend + seasonality + noise (opt heavy-tail) - inject_anomaly: spike / level_shift / variance_change / missing_segment / drift * non-overlapping segments (TDD caught an overlap bug) -> labels exactly match contiguous [start,end) runs * returns (series, point labels, segment metadata) - couple_event: persistent per-channel step at t + event text - add_missing: NaN drop at given rate - tests/test_synthesis.py (14 tests, RED->GREEN; fixed overlap regression) Exit criteria: seed-deterministic; labels cover segments; event step persistent.	2026-06-29 23:25:08 +08:00