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# Natural Language Toolkit utilities used in classifier module, should be migrated to main utilities later
# Author: Sumukh Ghodke <sumukh dot ghodke at gmail dot com>
#
# URL: <http://www.nltk.org/>
# This software is distributed under GPL, for license information see LICENSE.TXT
import UserList, math
class StatList(UserList.UserList):
def __init__(self, values=None):
UserList.UserList.__init__(self, values)
def mean(self):
if len(self.data) == 0: return 0
return float(sum([each for each in self.data])) / len(self.data)
def variance(self):
_mean = self.mean()
if len(self.data) < 2: return 0
return float(sum([pow((each - _mean), 2) for each in self.data])) / (len(self.data) - 1)
def std_dev(self):
return math.sqrt(self.variance())
def int_array_to_string(int_array):
return ','.join([str(each) for each in int_array])
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