user.py
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#!/usr/bin/python
# user - python module for classes and methods related to recommenders' users.
#
# Copyright (C) 2010 Tassia Camoes <tassia@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import commands
import xapian
import logging
import apt
class FilterTag(xapian.ExpandDecider):
"""
Extend xapian.ExpandDecider to consider only tag terms.
"""
def __call__(self, term):
"""
Return true if the term is a tag, else false.
"""
return term[:2] == "XT"
class User:
"""
Define a user of a recommender.
"""
def __init__(self,item_score,user_id=0,demographic_profile=0):
"""
Set initial parameters.
"""
self.id = user_id
self.item_score = item_score
self.pkg_profile = self.item_score.keys()
self.demographic_profile = demographic_profile
def items(self):
"""
Return dictionary relating items and repective scores.
"""
return self.item_score.keys()
def axi_tag_profile(self,apt_xapian_index,profile_size):
"""
Return most relevant tags for a list of packages based on axi.
"""
terms = []
for item in self.pkg_profile:
terms.append("XP"+item)
query = xapian.Query(xapian.Query.OP_OR, terms)
enquire = xapian.Enquire(apt_xapian_index)
enquire.set_query(query)
rset = xapian.RSet()
for m in enquire.get_mset(0,30000): #consider all matches
rset.add_document(m.docid)
eset = enquire.get_eset(profile_size, rset, FilterTag())
profile = []
for res in eset:
profile.append(res.term)
logging.debug("%.2f %s" % (res.weight,res.term[2:]))
return profile
def txi_tag_profile(self,tags_xapian_index,profile_size):
"""
Return most relevant tags for a list of packages based on tags index.
"""
return tags_xapian_index.relevant_tags_from_db(self.pkg_profile,
profile_size)
def maximal_pkg_profile(self):
"""
Return list of packages that are not dependence of any other package in
the list.
"""
cache = apt.Cache()
old_profile_size = len(self.pkg_profile)
for p in self.pkg_profile[:]: #iterate list copy
pkg = cache[p]
if pkg.candidate:
for dep in pkg.candidate.dependencies:
for or_dep in dep.or_dependencies:
if or_dep.name in self.pkg_profile:
self.pkg_profile.remove(or_dep.name)
profile_size = len(self.pkg_profile)
logging.info("Reduced packages profile size from %d to %d." %
(old_profile_size, profile_size))
class LocalSystem(User):
"""
Extend the class User to consider the packages installed on the local
system as the set of selected itens.
"""
def __init__(self):
"""
Set initial parameters.
"""
item_score = {}
dpkg_output = commands.getoutput('/usr/bin/dpkg --get-selections')
for line in dpkg_output.splitlines():
pkg = line.split('\t')[0]
item_score[pkg] = 1
User.__init__(self,item_score)
def no_auto_pkg_profile(self):
"""
Return list of packages voluntarily installed.
"""
cache = apt.Cache()
old_profile_size = len(self.pkg_profile)
for p in self.pkg_profile[:]: #iterate list copy
pkg = cache[p]
if pkg.is_auto_installed:
self.pkg_profile.remove(p)
profile_size = len(self.pkg_profile)
logging.info("Reduced packages profile size from %d to %d." %
(old_profile_size, profile_size))