-import sys
+import logging
import math
import random
+import sys
+from xonstat.models import *
+
+
+log = logging.getLogger(__name__)
+
class EloParms:
def __init__(self, global_K = 15, initial = 100, floor = 100, logdistancefactor = math.log(10)/float(400), maxlogdistance = math.log(10)):
return k
+def process_elos(game, session, game_type_cd=None):
+ if game_type_cd is None:
+ game_type_cd = game.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==game.game_id).\
+ one():
+ duration = d.seconds
+
+ scores = {}
+ alivetimes = {}
+ for (p,s,a) in session.query(PlayerGameStat.player_id,
+ PlayerGameStat.score, PlayerGameStat.alivetime).\
+ filter(PlayerGameStat.game_id==game.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
+
+ 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, ELOPARMS.initial)
+
+ 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])
+
+ elos = update_elos(game, session, elos, scores, ELOPARMS)
+
+ # add the elos to the session for committing
+ for e in elos:
+ session.add(elos[e])
+
+
+def update_elos(game, session, elos, scores, ep):
+ if len(elos) < 2:
+ return elos
+
+ pids = elos.keys()
+
+ eloadjust = {}
+ for pid in pids:
+ eloadjust[pid] = 0.0
+
+ for i in xrange(0, len(pids)):
+ ei = elos[pids[i]]
+ for j in xrange(i+1, len(pids)):
+ ej = elos[pids[j]]
+ si = scores[ei.player_id]
+ sj = scores[ej.player_id]
+
+ # normalize scores
+ ofs = min(0, si, sj)
+ si -= ofs
+ sj -= ofs
+ if si + sj == 0:
+ si, sj = 1, 1 # a draw
+
+ # real score factor
+ scorefactor_real = si / float(si + sj)
+
+ # duels are done traditionally - a win nets
+ # full points, not the score factor
+ if game.game_type_cd == 'duel':
+ # player i won
+ if scorefactor_real > 0.5:
+ scorefactor_real = 1.0
+ # player j won
+ elif scorefactor_real < 0.5:
+ scorefactor_real = 0.0
+ # nothing to do here for draws
+
+ # expected score factor by elo
+ elodiff = min(ep.maxlogdistance, max(-ep.maxlogdistance,
+ (float(ei.elo) - float(ej.elo)) * ep.logdistancefactor))
+ scorefactor_elo = 1 / (1 + math.exp(-elodiff))
+
+ # initial adjustment values, which we may modify with additional rules
+ adjustmenti = scorefactor_real - scorefactor_elo
+ adjustmentj = scorefactor_elo - scorefactor_real
+
+ # log.debug("Player i: {0}".format(ei.player_id))
+ # log.debug("Player i's K: {0}".format(ei.k))
+ # log.debug("Player j: {0}".format(ej.player_id))
+ # log.debug("Player j's K: {0}".format(ej.k))
+ # log.debug("Scorefactor real: {0}".format(scorefactor_real))
+ # log.debug("Scorefactor elo: {0}".format(scorefactor_elo))
+ # log.debug("adjustment i: {0}".format(adjustmenti))
+ # log.debug("adjustment j: {0}".format(adjustmentj))
+
+ if scorefactor_elo > 0.5:
+ # player i is expected to win
+ if scorefactor_real > 0.5:
+ # he DID win, so he should never lose points.
+ adjustmenti = max(0, adjustmenti)
+ else:
+ # he lost, but let's make it continuous (making him lose less points in the result)
+ adjustmenti = (2 * scorefactor_real - 1) * scorefactor_elo
+ else:
+ # player j is expected to win
+ if scorefactor_real > 0.5:
+ # he lost, but let's make it continuous (making him lose less points in the result)
+ adjustmentj = (1 - 2 * scorefactor_real) * (1 - scorefactor_elo)
+ else:
+ # he DID win, so he should never lose points.
+ adjustmentj = max(0, adjustmentj)
+
+ eloadjust[ei.player_id] += adjustmenti
+ eloadjust[ej.player_id] += adjustmentj
+
+ elo_deltas = {}
+ for pid in pids:
+ old_elo = float(elos[pid].elo)
+ new_elo = max(float(elos[pid].elo) + eloadjust[pid] * elos[pid].k * ep.global_K / float(len(elos) - 1), ep.floor)
+ 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))
+
+ save_elo_deltas(game, session, elo_deltas)
+
+ return elos
+
+
+def save_elo_deltas(game, 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 == game.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))
+
+
# parameters for K reduction
# this may be touched even if the DB already exists
KREDUCTION = KReduction(600, 120, 0.5, 0, 32, 0.2)
projects / xonotic / xonstat.git / blobdiff