def cross(history):
"""Iterate by crossing history and history[1:]
"""
backup = 0
if len(history):
yield state.start(), history[0][0], 1
for (s1, t1), (s2, t2) in izip(history, history[1:]):
duration = t2 - t1
if s1 == s2:
backup += duration
else:
if backup + duration <= MAX_DURATION \
and not state.terminal(s1):
yield s1, s2, backup + duration
else:
yield s1, state.finish(), 1
yield state.start(), s2, 1
backup = 0
yield history[-1][0], state.finish(), 1
def split(history):
"""Split history into segmentation
"""
splitted = []
segmented = []
for h in cross(history):
s1, s2, dt = h
segmented.append(h)
if s2 == state.finish():
splitted.append(segmented)
segmented = []
return splitted