[SashaMIT]

get_false_positives of [0, 1, 1, 1, 1] came back as 4. [1, 1, 1] came back as 3. After one frame above the threshold, the next 50 frames are supposed to be ignored, so each of those is one false positive. The clear length was len(transitions) - index, which is 0 or negative for a single run, so the extra frames were counted. A hit on the last frame, [0, 1], raised IndexError. A second hit 50 frames after the ignored window still counts: [1] plus 50 zeros plus [1] is 2. A score list that never crosses the threshold is 0.

Before the change, [0, 1, 1, 1, 1] was 4 and [0, 1] raised IndexError. After the change, python tests/test_metrics.py passes, 2 tests.