/usr/lib/python2.7/dist-packages/pyevolve/Statistics.py is in python-pyevolve 0.6~rc1+svn398+dfsg-6.
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:mod:`Statistics` -- statistical structure module
==========================================================================
This module have the class which is reponsible to keep statistics of each
generation. This class is used by the adapters and other statistics dump objects.
"""
class Statistics:
""" Statistics Class - A class bean-like to store the statistics
The statistics hold by this class are:
**rawMax, rawMin, rawAve**
Maximum, minimum and average of raw scores
**rawDev, rawVar**
Standard Deviation and Variance of raw scores
**fitMax, fitMin, fitAve**
Maximum, mininum and average of fitness scores
**rawTot, fitTot**
The total (sum) of raw scores and the fitness scores
Example:
>>> stats = ga_engine.getStatistics()
>>> st["rawMax"]
10.2
"""
def __init__(self):
""" The Statistics Class creator """
# 'fit' means 'fitness'
self.internalDict = { "rawMax" : 0.0,
"rawMin" : 0.0,
"rawAve" : 0.0,
"rawDev" : 0.0,
"rawVar" : 0.0,
"fitMax" : 0.0,
"fitMin" : 0.0,
"fitAve" : 0.0 }
self.descriptions = { "rawMax" : "Maximum raw score",
"rawMin" : "Minimum raw score",
"rawAve" : "Average of raw scores",
"rawDev" : "Standard deviation of raw scores",
"rawVar" : "Raw scores variance",
"fitMax" : "Maximum fitness",
"fitMin" : "Minimum fitness",
"fitAve" : "Fitness average" }
def __getitem__(self, key):
""" Return the specific statistic by key """
return self.internalDict[key]
def __setitem__(self, key, value):
""" Set the statistic """
self.internalDict[key] = value
def __len__(self):
""" Return the lenght of internal stats dictionary """
return len(self.internalDict)
def __repr__(self):
""" Return a string representation of the statistics """
strBuff = "- Statistics\n"
for k,v in self.internalDict.items():
strBuff += "\t%-45s = %.2f\n" % (self.descriptions.get(k, k), v)
return strBuff
def asTuple(self):
""" Returns the stats as a python tuple """
return tuple(self.internalDict.values())
def clear(self):
""" Set all statistics to zero """
for k in self.internalDict.keys():
self.internalDict[k] = 0
def items(self):
""" Return a tuple (name, value) for all stored statistics """
return self.internalDict.items()
def clone(self):
""" Instantiate a new Statistic class with the same contents """
clone_stat = Statistics()
self.copy(clone_stat)
return clone_stat
def copy(self, obj):
""" Copy the values to the obj variable of the same class
:param obj: the Statistics object destination
"""
obj.internalDict = self.internalDict.copy()
obj.descriptions = self.descriptions.copy()
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