def optimal(self, path, info_kws):
files = os.listdir(path)
res = []
for i, file in enumerate(files):
text_kws = FileUtil.readkws(os.path.join(path, file))
index = []
for key in info_kws:
if key in text_kws:
index.append(text_kws.index(key))
else:
break
delta = []
for k in range(1, len(index)):
delta.append(index[k] - index[k - 1])
var = numpy.var(delta)
res.append(var)
pos = res.index(min(res))
return files[pos]
