user.py
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#!/usr/bin/env python
"""
user - python module for classes and methods related to recommenders' users.
"""
__author__ = "Tassia Camoes Araujo <tassia@gmail.com>"
__copyright__ = "Copyright (C) 2011 Tassia Camoes Araujo"
__license__ = """
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 random
import commands
import xapian
import logging
import apt
from singleton import Singleton
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 DemographicProfile(Singleton):
def __init__(self):
self.admin = set(["admin", "hardware", "mail", "protocol",
"network", "security", "web", "interface::web"])
self.devel = set(["devel", "role::devel-lib", "role::shared-lib"])
self.desktop = set(["x11", "accessibility", "game", "junior", "office",
"interface::x11"])
self.art = set(["field::arts", "sound"])
self.science = set(["science", "biology", "field::astronomy",
"field::aviation", "field::biology",
"field::chemistry", "field::eletronics",
"field::finance", "field::geography",
"field::geology", "field::linguistics",
"field::mathematics", "field::medicine",
"field::meteorology", "field::physics",
"field::statistics"])
def __call__(self,profiles_set):
demographic_profile = set()
for profile in profiles_set:
demographic_profile = (demographic_profile | eval("self."+profile,{},{"self":self}))
return demographic_profile
class User:
"""
Define a user of a recommender.
"""
def __init__(self,item_score,user_id=0,profiles_set=0):
"""
Set initial user attributes. If no user_id was passed as parameter, a
random md5-hash is generated for that purpose. If the demographic
profile was not defined, it defaults to 'desktop'
"""
self.item_score = item_score
if user_id:
self.id = user_id
else:
random.seed()
self.id = random.getrandbits(128)
self.pkg_profile = self.item_score.keys()
if not profiles_set:
profiles_set = set(["desktop"])
self.set_demographic_profile(profiles_set)
def set_demographic_profile(self,profiles_set):
self.demographic_profile = DemographicProfile()(profiles_set)
def items(self):
"""
Return the set of user items.
"""
return set(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 = ["XP"+item for item in self.pkg_profile]
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,apt_xapian_index.get_doccount()):
rset.add_document(m.docid)
# statistically good differentiators between relevant and non-relevant
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.lstrip("XT")))
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))
return set(self.pkg_profile)
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))