def test_simultaneous_game_noisy_policy(self, game_name):
game = pyspiel.load_game(game_name)
policy = openspiel_policy.UniformRandomPolicy(game)
all_states = get_all_states.get_all_states(
game,
depth_limit=10,
include_terminals=False,
include_chance_states=False,
to_string=lambda s: s.history_str())
for current_player in range(game.num_players()):
noise = noisy_policy.NoisyPolicy(policy,
player_id=current_player,
alpha=0.5,
beta=10.)
for state in all_states.values():
if state.current_player() == pyspiel.PlayerId.SIMULTANEOUS:
for player_id in range(game.num_players()):
if player_id != current_player:
self.assertEqual(
policy.action_probabilities(state, player_id),
noise.action_probabilities(state, player_id))
else:
self.assertNotEqual(
policy.action_probabilities(state, player_id),
noise.action_probabilities(state, player_id))
def test_cpp_and_python_implementations_are_identical(self, game_name):
game = pyspiel.load_game(game_name)
policy = openspiel_policy.UniformRandomPolicy(game)
all_states = get_all_states.get_all_states(
game,
depth_limit=-1,
include_terminals=False,
include_chance_states=False,
to_string=lambda s: s.information_state_string())
for current_player in range(game.num_players()):
noise = noisy_policy.NoisyPolicy(policy,
player_id=current_player,
alpha=0.5,
beta=10.)
for state in all_states.values():
if state.current_player() < 0:
continue
if state.current_player() != current_player:
self.assertEqual(policy.action_probabilities(state),
noise.action_probabilities(state))
else:
self.assertNotEqual(policy.action_probabilities(state),
noise.action_probabilities(state))
def compute_regret_policy(game,
policy,
num_random_policy_tested=10,
num_sample=100):
time_tick = time.time()
expected_value_policy = get_expected_value(game, policy, num_sample)
worse_regret = 0
for _ in range(num_random_policy_tested):
noisy_n_policy = noisy_policy.NoisyPolicy(policy, player_id=0, alpha=1)
expected_value_noise = get_expected_value(game,
noisy_n_policy,
num_sample,
player=0)
approximate_regret = expected_value_noise - expected_value_policy
worse_regret = max(worse_regret, approximate_regret)
return worse_regret, time.time() - time_tick
def copy_with_noise(self, alpha=0.0, beta=0.0):
"""Copies this policy and adds noise, making it a Noisy Best Response.
The policy's new probabilities P' on each state s become
P'(s) = alpha * epsilon + (1-alpha) * P(s)
With P the former policy's probabilities, and epsilon ~ Softmax(beta *
Uniform)
Args:
alpha: First mixture component
beta: Softmax 1/temperature component
Returns:
Noisy copy of best response.
"""
return noisy_policy.NoisyPolicy(self, alpha, beta, self.all_states)
