def max_chunk(ref, hyp):
n_matches = len(align.alignment(ref, hyp))
if n_matches == 0: return 0
return max(len(chunk) for chunk in align.chunks(ref, hyp))/float(n_matches)
def fragmentation(ref, hyp):
n_matches = len(align.alignment(ref, hyp))
if n_matches == 0: return 0
n_chunks = sum(1 for c in align.chunks(ref, hyp))
return n_chunks/float(n_matches)