- def process_elos(self, session, game_type_cd=None):
- if game_type_cd is None:
- game_type_cd = self.game_type_cd
-
- # we do not have the actual duration of the game, so use the
- # maximum alivetime of the players instead
- duration = 0
- for d in session.query(sfunc.max(PlayerGameStat.alivetime)).\
- filter(PlayerGameStat.game_id==self.game_id).\
- one():
- duration = d.seconds
-
- scores = {}
- alivetimes = {}
- winners = []
- losers = []
- for (p,s,a,r,t) in session.query(PlayerGameStat.player_id,
- PlayerGameStat.score, PlayerGameStat.alivetime,
- PlayerGameStat.rank, PlayerGameStat.team).\
- filter(PlayerGameStat.game_id==self.game_id).\
- filter(PlayerGameStat.alivetime > timedelta(seconds=0)).\
- filter(PlayerGameStat.player_id > 2).\
- all():
- # scores are per second
- scores[p] = s/float(a.seconds)
- alivetimes[p] = a.seconds
-
- # winners are either rank 1 or on the winning team
- # team games are where the team is set (duh)
- if r == 1 or (t == self.winner and t is not None):
- winners.append(p)
- else:
- losers.append(p)
-
- player_ids = scores.keys()
-
- elos = {}
- for e in session.query(PlayerElo).\
- filter(PlayerElo.player_id.in_(player_ids)).\
- filter(PlayerElo.game_type_cd==game_type_cd).all():
- elos[e.player_id] = e
-
- # ensure that all player_ids have an elo record
- for pid in player_ids:
- if pid not in elos.keys():
- elos[pid] = PlayerElo(pid, game_type_cd)
-
- for pid in player_ids:
- elos[pid].k = KREDUCTION.eval(elos[pid].games, alivetimes[pid],
- duration)
- if elos[pid].k == 0:
- del(elos[pid])
- del(scores[pid])
- del(alivetimes[pid])
-
- if pid in winners:
- winners.remove(pid)
- else:
- losers.remove(pid)
-
- elos = self.update_elos(session, elos, scores, winners, losers, ELOPARMS)
-
- # add the elos to the session for committing
- for e in elos:
- session.add(elos[e])
-
- def update_elos(self, session, elos, scores, winners, losers, ep):
- if len(elos) < 2 or len(winners) == 0 or len(losers) == 0:
- return elos
-
- pids = elos.keys()
-
- elo_deltas = {}
- for w_pid in winners:
- w_elo = elos[w_pid]
- for l_pid in losers:
- l_elo = elos[l_pid]
-
- w_q = math.pow(10, float(w_elo.elo)/400.0)
- l_q = math.pow(10, float(l_elo.elo)/400.0)
-
- w_delta = w_elo.k * ELOPARMS.global_K * (1 - w_q/(w_q + l_q))
- l_delta = l_elo.k * ELOPARMS.global_K * (0 - l_q/(l_q + w_q))
-
- elo_deltas[w_pid] = (elo_deltas.get(w_pid, 0.0) + w_delta)
- elo_deltas[l_pid] = (elo_deltas.get(l_pid, 0.0) + l_delta)
-
- log.debug("Winner {0}'s elo_delta vs Loser {1}: {2}".format(w_pid,
- l_pid, w_delta))
-
- log.debug("Loser {0}'s elo_delta vs Winner {1}: {2}".format(l_pid,
- w_pid, l_delta))
-
- log.debug("w_elo: {0}, w_k: {1}, w_q: {2}, l_elo: {3}, l_k: {4}, l_q: {5}".\
- format(w_elo.elo, w_elo.k, l_q, l_elo.elo, l_elo.k, l_q))
-
- for pid in pids:
- # average the elo gain for team games
- if pid in winners:
- elo_deltas[pid] = elo_deltas.get(pid, 0.0) / len(losers)
- else:
- elo_deltas[pid] = elo_deltas.get(pid, 0.0) / len(winners)
-
- old_elo = float(elos[pid].elo)
- new_elo = max(float(elos[pid].elo) + elo_deltas[pid], ep.floor)
-
- # in case we've set a different delta from the above
- elo_deltas[pid] = new_elo - old_elo
-
- elos[pid].elo = new_elo
- elos[pid].games += 1
- log.debug("Setting Player {0}'s Elo delta to {1}. Elo is now {2} (was {3}).".\
- format(pid, elo_deltas[pid], new_elo, old_elo))
-
- self.save_elo_deltas(session, elo_deltas)
-
- return elos
-
-
- def save_elo_deltas(self, session, elo_deltas):
- """
- Saves the amount by which each player's Elo goes up or down
- in a given game in the PlayerGameStat row, allowing for scoreboard display.
-
- elo_deltas is a dictionary such that elo_deltas[player_id] is the elo_delta
- for that player_id.
- """
- pgstats = {}
- for pgstat in session.query(PlayerGameStat).\
- filter(PlayerGameStat.game_id == self.game_id).\
- all():
- pgstats[pgstat.player_id] = pgstat
-
- for pid in elo_deltas.keys():
- try:
- pgstats[pid].elo_delta = elo_deltas[pid]
- session.add(pgstats[pid])
- except:
- log.debug("Unable to save Elo delta value for player_id {0}".format(pid))
-
-
-