# zai_dfa_v1_fix

 Author zdg Submission date 2011-10-23 15:02:55.376487 Rating 7225 Matches played 1180 Win rate 74.75

Use rpsrunner.py to play unranked matches on your computer.

## Source code:

``````# uses an adaptive dfa to switch between the 6 ways of using beat last strategy
# fixed the update of the adaptive dfa to use the last mode

# --------------------- initialization -----------------------------
if not input:
import random, math
import itertools, operator, collections

R, P, S = 0, 1, 2
RPS = [R, P, S]
T, W, L = R, P, S
PAYOFFS = [T, W, L]
scorep = [0, 1, -1]
to_win = [W, T, L]
convert = {'R':R, 'P':P, 'S':S, R:'R', P:'P', S:'S'}
subh = [[T, L, W], [W, T, L], [L, W, T]]
addh = [[R, P, S], [P, S, R], [S, R, P]]
POWER3 = [3 ** n for n in xrange(10)]

def pick_max(vec):
maxix = 0
accmax = vec[0]
for i in xrange(1, len(vec)):
if vec[i] >= accmax:
accmax = vec[i]
maxix = i
return maxix

def normalize(u):
factor = 1.0 / sum(u)
for i in xrange(len(u)):
u[i] *= factor

def pick_weighted(v):
u = random.random()
acc = 0.0
for i, p in enumerate(v):
acc += p
if u < acc:
return (i, p)

class LastBot(object):
def __init__(self, op_moves, offset):
self.op_moves = op_moves
self.offset = offset

def update(self):

op_hands = []
my_hands = []
payoffs = []
op_payoffs = []

output = convert[random.choice(RPS)]
# --------------------- turn -----------------------------
else:
last_input, last_output = convert[input], convert[output]
my_hands.append(last_output)
op_hands.append(last_input)
payoffs.append(subh[last_output][last_input])
op_payoffs.append(subh[last_input][last_output])
hands_played = len(op_hands)

# bot initialization after first turn
if hands_played == 1:
bots = [
LastBot(op_hands, W),
LastBot(my_hands, L),
LastBot(op_hands, T),
LastBot(my_hands, W),
LastBot(op_hands, L),
LastBot(my_hands, T)]
transitions = [
[[0,1,0,0,0,0], [1,0,0,0,0,0], [0,0,1,0,0,0]],
[[0,0,1,0,0,0], [0,1,0,0,0,0], [0,0,0,1,0,0]],
[[0,0,0,1,0,0], [0,0,1,0,0,0], [0,0,0,0,1,0]],
[[0,0,0,0,1,0], [0,0,0,1,0,0], [0,0,0,0,0,1]],
[[0,0,0,0,0,1], [0,0,0,0,1,0], [1,0,0,0,0,0]],
[[1,0,0,0,0,0], [0,0,0,0,0,1], [0,1,0,0,0,0]]]
last_mode = 0
mode = 0
for b in bots:
b.update()
next_hand = bots[mode].next_hand
else:
# update the dfa with last_mode -> mode transition
last_transition = transitions[last_mode][payoffs[-2]]
for i in xrange(6):
if bots[i].next_hand == beats[last_input]:
last_transition[i] += 1
# elif bots[i].next_hand == loses[last_input]:
# if last_transition[i] > 0:
# last_transition[i] -= min(0.5, last_transition[i])

# update the bots
for b in bots:
b.update()

# use the dfa to predict the next state to go to
nextstatep = transitions[mode][payoffs[-1]][:]
normalize(nextstatep)
last_mode = mode
mode = pick_weighted(nextstatep)[0]
# mode = pick_max(transitions[mode][payoffs[-1]])

next_hand = bots[mode].next_hand

output = convert[next_hand]

# if hands_played == 999:
# print transitions``````