def test_save_load(self):
policy = CNNPolicy(["board", "liberties", "sensibleness", "capture_size"])
model_file = "TESTPOLICY.json"
weights_file = "TESTWEIGHTS.h5"
model_file2 = "TESTPOLICY2.json"
weights_file2 = "TESTWEIGHTS2.h5"
# test saving model/weights separately
policy.save_model(model_file)
policy.model.save_weights(weights_file, overwrite=True)
# test saving them together
policy.save_model(model_file2, weights_file2)
copypolicy = CNNPolicy.load_model(model_file)
copypolicy.model.load_weights(weights_file)
copypolicy2 = CNNPolicy.load_model(model_file2)
for w1, w2 in zip(copypolicy.model.get_weights(), copypolicy2.model.get_weights()):
self.assertTrue(np.all(w1 == w2))
os.remove(model_file)
os.remove(weights_file)
os.remove(model_file2)
os.remove(weights_file2)
def run_and_get_new_weights(init_weights, winners, game):
# Create "mock" states that end after 2 moves with a predetermined winner.
states = [MockState(winner, 2, size=19) for winner in winners]
policy1 = CNNPolicy.load_model(
os.path.join('tests', 'test_data', 'minimodel_policy.json'))
policy2 = CNNPolicy.load_model(
os.path.join('tests', 'test_data', 'minimodel_policy.json'))
policy1.model.set_weights(init_weights)
optimizer = SGD(lr=0.001)
policy1.model.compile(loss=log_loss, optimizer=optimizer)
learner = MockPlayer(policy1, game)
opponent = MockPlayer(policy2, game)
# Run RL training
run_n_games(optimizer,
0.001,
learner,
opponent,
2,
mock_states=states)
return policy1.model.get_weights()
def test_save_load(self): policy = CNNPolicy(["board", "liberties", "sensibleness", "capture_size"]) model_file = 'TESTPOLICY.json' weights_file = 'TESTWEIGHTS.h5' model_file2 = 'TESTPOLICY2.json' weights_file2 = 'TESTWEIGHTS2.h5' # test saving model/weights separately policy.save_model(model_file) policy.model.save_weights(weights_file, overwrite=True) # test saving them together policy.save_model(model_file2, weights_file2) copypolicy = CNNPolicy.load_model(model_file) copypolicy.model.load_weights(weights_file) copypolicy2 = CNNPolicy.load_model(model_file2) for w1, w2 in zip(copypolicy.model.get_weights(), copypolicy2.model.get_weights()): self.assertTrue(np.all(w1 == w2)) os.remove(model_file) os.remove(weights_file) os.remove(model_file2) os.remove(weights_file2)
def test_game_decrease(game):
# Create "mock" state that ends after 20 moves with the learner losing
lose_state = [MockState(go.WHITE, 20, size=19)]
policy1 = CNNPolicy.load_model(
os.path.join('tests', 'test_data', 'minimodel_policy.json'))
policy2 = CNNPolicy.load_model(
os.path.join('tests', 'test_data', 'minimodel_policy.json'))
learner = MockPlayer(policy1, game)
opponent = MockPlayer(policy2, game)
optimizer = SGD(lr=0.001)
policy1.model.compile(loss=log_loss, optimizer=optimizer)
# Get initial (before learning) move probabilities for all moves made by black
init_move_probs = get_sgf_move_probs(game, policy1, go.BLACK)
init_probs = [prob for (mv, prob) in init_move_probs]
# Run RL training
run_n_games(optimizer,
0.001,
learner,
opponent,
1,
mock_states=lose_state)
# Get new move probabilities for black's moves having finished 1 round of training
new_move_probs = get_sgf_move_probs(game, policy1, go.BLACK)
new_probs = [prob for (mv, prob) in new_move_probs]
# Assert that, on average, move probabilities for black decreased having lost.
self.assertTrue(
sum((new_probs[i] - init_probs[i]) for i in range(10)) < 0)
def test_game_gradient(game):
policy = CNNPolicy.load_model(
os.path.join('tests', 'test_data', 'minimodel_policy.json'))
initial_parameters = policy.model.get_weights()
# Cases 1 and 2 have identical starting models and identical (state, action) pairs,
# but they differ in who won the games.
parameters1 = run_and_get_new_weights(initial_parameters,
[go.BLACK, go.WHITE], game)
parameters2 = run_and_get_new_weights(initial_parameters,
[go.WHITE, go.BLACK], game)
# Assert that some parameters changed.
any_change_1 = any(
not np.array_equal(i, p1)
for (i, p1) in zip(initial_parameters, parameters1))
any_change_2 = any(
not np.array_equal(i, p2)
for (i, p2) in zip(initial_parameters, parameters2))
self.assertTrue(any_change_1)
self.assertTrue(any_change_2)
# Changes in case 1 should be equal and opposite to changes in case 2. Allowing 0.1%
# difference in precision.
for (i, p1, p2) in zip(initial_parameters, parameters1,
parameters2):
diff1 = p1 - i
diff2 = p2 - i
npt.assert_allclose(diff1, -diff2, rtol=1e-3, atol=1e-11)
def test_game_run_N(game):
policy1 = CNNPolicy.load_model(os.path.join('tests', 'test_data', 'minimodel.json'))
policy2 = CNNPolicy.load_model(os.path.join('tests', 'test_data', 'minimodel.json'))
learner = MockPlayer(policy1, game)
opponent = MockPlayer(policy2, game)
optimizer = SGD()
init_weights = policy1.model.get_weights()
policy1.model.compile(loss=log_loss, optimizer=optimizer)
# Run RL training
run_n_games(optimizer, learner, opponent, 2)
# Get new weights for comparison
trained_weights = policy1.model.get_weights()
# Assert that some parameters changed.
any_change = any(not np.array_equal(i, t)
for (i, t) in zip(init_weights, trained_weights))
self.assertTrue(any_change)
def test_save_load(self): policy = CNNPolicy(["board", "liberties", "sensibleness", "capture_size"]) model_file = 'TESTPOLICY.json' weights_file = 'TESTWEIGHTS.h5' policy.save_model(model_file) policy.model.save_weights(weights_file) copypolicy = CNNPolicy.load_model(model_file) copypolicy.model.load_weights(weights_file) os.remove(model_file) os.remove(weights_file)
def test_save_load(self):
policy = CNNPolicy(
["board", "liberties", "sensibleness", "capture_size"])
model_file = 'TESTPOLICY.json'
weights_file = 'TESTWEIGHTS.h5'
policy.save_model(model_file)
policy.model.save_weights(weights_file)
copypolicy = CNNPolicy.load_model(model_file)
copypolicy.model.load_weights(weights_file)
os.remove(model_file)
os.remove(weights_file)
def run_training(cmd_line_args=None):
"""Run training. command-line args may be passed in as a list
"""
import argparse
parser = argparse.ArgumentParser(description='Perform supervised training on a policy network.')
# required args
parser.add_argument("model", help="Path to a JSON model file (i.e. from CNNPolicy.save_model())")
parser.add_argument("train_data", help="A .h5 file of training data")
parser.add_argument("out_directory", help="directory where metadata and weights will be saved")
# frequently used args
parser.add_argument("--minibatch", "-B", help="Size of training data minibatches. Default: 16", type=int, default=16)
parser.add_argument("--epochs", "-E", help="Total number of iterations on the data. Default: 10", type=int, default=10)
parser.add_argument("--epoch-length", "-l", help="Number of training examples considered 'one epoch'. Default: # training data", type=int, default=None)
parser.add_argument("--learning-rate", "-r", help="Learning rate - how quickly the model learns at first. Default: .03", type=float, default=.03)
parser.add_argument("--decay", "-d", help="The rate at which learning decreases. Default: .0001", type=float, default=.0001)
parser.add_argument("--verbose", "-v", help="Turn on verbose mode", default=False, action="store_true")
# slightly fancier args
parser.add_argument("--weights", help="Name of a .h5 weights file (in the output directory) to load to resume training", default=None)
parser.add_argument("--train-val-test", help="Fraction of data to use for training/val/test. Must sum to 1. Invalid if restarting training", nargs=3, type=float, default=[0.93, .05, .02])
# TODO - an argument to specify which transformations to use, put it in metadata
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
# TODO - what follows here should be refactored into a series of small functions
resume = args.weights is not None
if args.verbose:
if resume:
print "trying to resume from %s with weights %s" % (args.out_directory, os.path.join(args.out_directory, args.weights))
else:
if os.path.exists(args.out_directory):
print "directory %s exists. any previous data will be overwritten" % args.out_directory
else:
print "starting fresh output directory %s" % args.out_directory
# load model from json spec
model = CNNPolicy.load_model(args.model).model
if resume:
model.load_weights(os.path.join(args.out_directory, args.weights))
# TODO - (waiting on game_converter) verify that features of model match features of training data
dataset = h5.File(args.train_data)
n_total_data = len(dataset["states"])
n_train_data = int(args.train_val_test[0] * n_total_data)
n_val_data = int(args.train_val_test[1] * n_total_data)
# n_test_data = n_total_data - (n_train_data + n_val_data)
if args.verbose:
print "datset loaded"
print "\t%d total samples" % n_total_data
print "\t%d training samples" % n_train_data
print "\t%d validaion samples" % n_val_data
# ensure output directory is available
if not os.path.exists(args.out_directory):
os.makedirs(args.out_directory)
# create metadata file and the callback object that will write to it
meta_file = os.path.join(args.out_directory, "metadata.json")
meta_writer = MetadataWriterCallback(meta_file)
# load prior data if it already exists
if os.path.exists(meta_file) and resume:
with open(meta_file, "r") as f:
meta_writer.metadata = json.load(f)
if args.verbose:
print "previous metadata loadeda: %d epochs. new epochs will be appended." % len(meta_writer.metadata["epochs"])
elif args.verbose:
print "starting with empty metadata"
# the MetadataWriterCallback only sets 'epoch' and 'best_epoch'. We can add in anything else we like here
# TODO - model and train_data are saved in meta_file; check that they match (and make args optional when restarting?)
meta_writer.metadata["training_data"] = args.train_data
meta_writer.metadata["model_file"] = args.model
# create ModelCheckpoint to save weights every epoch
checkpoint_template = os.path.join(args.out_directory, "weights.{epoch:05d}.hdf5")
checkpointer = ModelCheckpoint(checkpoint_template)
# load precomputed random-shuffle indices or create them
# TODO - save each train/val/test indices separately so there's no danger of
# changing args.train_val_test when resuming
shuffle_file = os.path.join(args.out_directory, "shuffle.npz")
if os.path.exists(shuffle_file) and resume:
with open(shuffle_file, "r") as f:
shuffle_indices = np.load(f)
if args.verbose:
print "loading previous data shuffling indices"
else:
# create shuffled indices
shuffle_indices = np.random.permutation(n_total_data)
with open(shuffle_file, "w") as f:
np.save(f, shuffle_indices)
if args.verbose:
print "created new data shuffling indices"
# training indices are the first consecutive set of shuffled indices, val next, then test gets the remainder
train_indices = shuffle_indices[0:n_train_data]
val_indices = shuffle_indices[n_train_data:n_train_data + n_val_data]
# test_indices = shuffle_indices[n_train_data + n_val_data:]
# create dataset generators
train_data_generator = shuffled_hdf5_batch_generator(
dataset["states"],
dataset["actions"],
train_indices,
args.minibatch,
BOARD_TRANSFORMATIONS)
val_data_generator = shuffled_hdf5_batch_generator(
dataset["states"],
dataset["actions"],
val_indices,
args.minibatch,
BOARD_TRANSFORMATIONS)
sgd = SGD(lr=args.learning_rate, decay=args.decay)
model.compile(loss='categorical_crossentropy', optimizer=sgd, metrics=["accuracy"])
samples_per_epoch = args.epoch_length or n_train_data
if args.verbose:
print "STARTING TRAINING"
model.fit_generator(
generator=train_data_generator,
samples_per_epoch=samples_per_epoch,
nb_epoch=args.epochs,
callbacks=[checkpointer, meta_writer],
validation_data=val_data_generator,
nb_val_samples=n_val_data)
def train(metadata, out_directory, verbose, weight_file, meta_file):
# set resume
resume = weight_file is not None
# load model from json spec
policy = CNNPolicy.load_model(metadata["model_file"])
model_features = policy.preprocessor.get_feature_list()
model = policy.model
# load weights
if resume:
model.load_weights(
os.path.join(out_directory, FOLDER_WEIGHT, weight_file))
# features of training data
dataset = h5.File(metadata["training_data"])
# Verify that dataset's features match the model's expected features.
validate_feature_planes(verbose, dataset, model_features)
# create metadata file and the callback object that will write to it
# and saves model at the same time
# the MetadataWriterCallback only sets 'epoch', 'best_epoch' and 'current_batch'.
# We can add in anything else we like here
meta_writer = EpochDataSaverCallback(meta_file, out_directory, metadata)
# get train/validation/test indices
train_indices, val_indices, test_indices \
= load_train_val_test_indices(verbose, metadata['symmetries'], len(dataset["states"]),
metadata["batch_size"], out_directory)
# create dataset generators
train_data_generator = threading_shuffled_hdf5_batch_generator(
dataset["states"], dataset["actions"], train_indices,
metadata["batch_size"], metadata)
val_data_generator = threading_shuffled_hdf5_batch_generator(
dataset["states"],
dataset["actions"],
val_indices,
metadata["batch_size"],
validation=True)
# check if step decay has to be applied
if metadata["decay_every"] is None:
# use normal decay without momentum
lr_scheduler_callback = LrDecayCallback(metadata)
else:
# use step decay
lr_scheduler_callback = LrStepDecayCallback(metadata, verbose)
sgd = SGD(lr=metadata["learning_rate"])
model.compile(loss='categorical_crossentropy',
optimizer=sgd,
metrics=["accuracy"])
if verbose:
print("STARTING TRAINING")
# check that remaining epoch > 0
if metadata["epochs"] <= len(metadata["epoch_logs"]):
raise ValueError("No more epochs to train!")
model.fit_generator(
generator=train_data_generator,
steps_per_epoch=(metadata["epoch_length"] / metadata["batch_size"]),
epochs=(metadata["epochs"] - len(metadata["epoch_logs"])),
callbacks=[meta_writer, lr_scheduler_callback],
validation_data=val_data_generator,
validation_steps=(len(val_indices) / metadata["batch_size"]))
def run_training(cmd_line_args=None):
parser = argparse.ArgumentParser(description='Perform reinforcement learning to improve given policy network. Second phase of pipeline.')
parser.add_argument("model_json", help="Path to policy model JSON.")
parser.add_argument("initial_weights", help="Path to HDF5 file with inital weights (i.e. result of supervised training).")
parser.add_argument("out_directory", help="Path to folder where the model params and metadata will be saved after each epoch.")
parser.add_argument("--learning-rate", help="Keras learning rate (Default: .03)", type=float, default=.03)
parser.add_argument("--policy-temp", help="Distribution temperature of players using policies (Default: 0.67)", type=float, default=0.67)
parser.add_argument("--save-every", help="Save policy as a new opponent every n batches (Default: 500)", type=int, default=500)
parser.add_argument("--game-batch", help="Number of games per mini-batch (Default: 20)", type=int, default=20)
parser.add_argument("--iterations", help="Number of training batches/iterations (Default: 10000)", type=int, default=10000)
parser.add_argument("--resume", help="Load latest weights in out_directory and resume", default=False, action="store_true")
parser.add_argument("--verbose", "-v", help="Turn on verbose mode", default=False, action="store_true")
# Baseline function (TODO) default lambda state: 0 (receives either file
# paths to JSON and weights or None, in which case it uses default baseline 0)
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
ZEROTH_FILE = "weights.00000.hdf5"
if args.resume:
if not os.path.exists(os.path.join(args.out_directory, "metadata.json")):
raise ValueError("Cannot resume without existing output directory")
if not os.path.exists(args.out_directory):
if args.verbose:
print ("creating output directory {}".format(args.out_directory))
os.makedirs(args.out_directory)
if not args.resume:
# make a copy of weights file, "weights.00000.hdf5" in the output directory
copyfile(args.initial_weights, os.path.join(args.out_directory, ZEROTH_FILE))
if args.verbose:
print ("copied {} to {}".format(args.initial_weights, os.path.join(args.out_directory, ZEROTH_FILE)))
player_weights = ZEROTH_FILE
else:
# if resuming, we expect initial_weights to be just a "weights.#####.hdf5" file, not a full path
args.initial_weights = os.path.join(args.out_directory, os.path.basename(args.initial_weights))
if not os.path.exists(args.initial_weights):
raise ValueError("Cannot resume; weights {} do not exist".format(args.initial_weights))
elif args.verbose:
print ("Resuming with weights {}".format(args.initial_weights))
player_weights = os.path.basename(args.initial_weights)
# Set initial conditions
policy = CNNPolicy.load_model(args.model_json)
policy.model.load_weights(args.initial_weights)
player = ProbabilisticPolicyPlayer(policy, temperature=args.policy_temp)
features = policy.preprocessor.feature_list
# different opponents come from simply changing the weights of
# opponent.policy.model "behind the scenes"
opp_policy = CNNPolicy.load_model(args.model_json)
opponent = ProbabilisticPolicyPlayer(opp_policy, temperature=args.policy_temp)
if args.verbose:
print ("created player and opponent with temperature {}".format(args.policy_temp))
if not args.resume:
metadata = {
"model_file": args.model_json,
"init_weights": args.initial_weights,
"learning_rate": args.learning_rate,
"temperature": args.policy_temp,
"game_batch": args.game_batch,
"opponents": [ZEROTH_FILE], # which weights from which to sample an opponent each batch
"win_ratio": {} # map from player to tuple of (opponent, win ratio) Useful for validating in lieu of 'accuracy/loss'
}
else:
with open(os.path.join(args.out_directory, "metadata.json"), "r") as f:
metadata = json.load(f)
def save_metadata():
with open(os.path.join(args.out_directory, "metadata.json"), "w") as f:
json.dump(metadata, f)
# Set SGD and compile
sgd = SGD(lr=args.learning_rate)
player.policy.model.compile(loss='binary_crossentropy', optimizer=sgd)
board_size = player.policy.model.input_shape[-1]
for i_iter in xrange(1, args.iterations + 1):
# Train mini-batches by randomly choosing opponent from pool (possibly self)
# and playing game_batch games against them
opp_weights = np.random.choice(metadata["opponents"])
opp_path = os.path.join(args.out_directory, opp_weights)
# load new weights into opponent, but otherwise its the same
opponent.policy.model.load_weights(opp_path)
if args.verbose:
print ("Batch {}\tsampled opponent is {}".format(i_iter, opp_weights))
# Make training pairs and do RL
X_list, y_list, winners = make_training_pairs(player, opponent, features, args.game_batch, board_size)
win_ratio = np.sum(np.array(winners) == 1) / float(args.game_batch)
metadata["win_ratio"][player_weights] = (opp_weights, win_ratio)
train_batch(player, X_list, y_list, winners, args.learning_rate)
# Save intermediate models
player_weights = "weights.%05d.hdf5" % i_iter
player.policy.model.save_weights(os.path.join(args.out_directory, player_weights))
# add player to batch of oppenents once in a while
if i_iter % args.save_every == 0:
metadata["opponents"].append(player_weights)
save_metadata()
def run_training(cmd_line_args=None):
parser = argparse.ArgumentParser(
description=
'Perform reinforcement learning to improve given policy network. Second phase of pipeline.'
)
parser.add_argument("model_json", help="Path to policy model JSON.")
parser.add_argument(
"initial_weights",
help=
"Path to HDF5 file with inital weights (i.e. result of supervised training)."
)
parser.add_argument(
"out_directory",
help=
"Path to folder where the model params and metadata will be saved after each epoch."
)
parser.add_argument("--learning-rate",
help="Keras learning rate (Default: .03)",
type=float,
default=.03)
parser.add_argument(
"--policy-temp",
help=
"Distribution temperature of players using policies (Default: 0.67)",
type=float,
default=0.67)
parser.add_argument(
"--save-every",
help="Save policy as a new opponent every n batches (Default: 500)",
type=int,
default=500)
parser.add_argument("--game-batch",
help="Number of games per mini-batch (Default: 20)",
type=int,
default=20)
parser.add_argument(
"--iterations",
help="Number of training batches/iterations (Default: 10000)",
type=int,
default=10000)
parser.add_argument("--resume",
help="Load latest weights in out_directory and resume",
default=False,
action="store_true")
parser.add_argument("--verbose",
"-v",
help="Turn on verbose mode",
default=False,
action="store_true")
# Baseline function (TODO) default lambda state: 0 (receives either file
# paths to JSON and weights or None, in which case it uses default baseline 0)
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
ZEROTH_FILE = "weights.00000.hdf5"
if args.resume:
if not os.path.exists(os.path.join(args.out_directory,
"metadata.json")):
raise ValueError("Cannot resume without existing output directory")
if not os.path.exists(args.out_directory):
if args.verbose:
print("creating output directory {}".format(args.out_directory))
os.makedirs(args.out_directory)
if not args.resume:
# make a copy of weights file, "weights.00000.hdf5" in the output directory
copyfile(args.initial_weights,
os.path.join(args.out_directory, ZEROTH_FILE))
if args.verbose:
print("copied {} to {}".format(
args.initial_weights,
os.path.join(args.out_directory, ZEROTH_FILE)))
player_weights = ZEROTH_FILE
else:
# if resuming, we expect initial_weights to be just a "weights.#####.hdf5" file, not a full path
args.initial_weights = os.path.join(
args.out_directory, os.path.basename(args.initial_weights))
if not os.path.exists(args.initial_weights):
raise ValueError("Cannot resume; weights {} do not exist".format(
args.initial_weights))
elif args.verbose:
print("Resuming with weights {}".format(args.initial_weights))
player_weights = os.path.basename(args.initial_weights)
# Set initial conditions
policy = CNNPolicy.load_model(args.model_json)
policy.model.load_weights(args.initial_weights)
player = ProbabilisticPolicyPlayer(policy, temperature=args.policy_temp)
features = policy.preprocessor.feature_list
# different opponents come from simply changing the weights of
# opponent.policy.model "behind the scenes"
opp_policy = CNNPolicy.load_model(args.model_json)
opponent = ProbabilisticPolicyPlayer(opp_policy,
temperature=args.policy_temp)
if args.verbose:
print("created player and opponent with temperature {}".format(
args.policy_temp))
if not args.resume:
metadata = {
"model_file": args.model_json,
"init_weights": args.initial_weights,
"learning_rate": args.learning_rate,
"temperature": args.policy_temp,
"game_batch": args.game_batch,
"opponents":
[ZEROTH_FILE
], # which weights from which to sample an opponent each batch
"win_ratio": {
} # map from player to tuple of (opponent, win ratio) Useful for validating in lieu of 'accuracy/loss'
}
else:
with open(os.path.join(args.out_directory, "metadata.json"), "r") as f:
metadata = json.load(f)
def save_metadata():
with open(os.path.join(args.out_directory, "metadata.json"), "w") as f:
json.dump(metadata, f)
# Set SGD and compile
sgd = SGD(lr=args.learning_rate)
player.policy.model.compile(loss='binary_crossentropy', optimizer=sgd)
board_size = player.policy.model.input_shape[-1]
for i_iter in xrange(1, args.iterations + 1):
# Train mini-batches by randomly choosing opponent from pool (possibly self)
# and playing game_batch games against them
opp_weights = np.random.choice(metadata["opponents"])
opp_path = os.path.join(args.out_directory, opp_weights)
# load new weights into opponent, but otherwise its the same
opponent.policy.model.load_weights(opp_path)
if args.verbose:
print("Batch {}\tsampled opponent is {}".format(
i_iter, opp_weights))
# Make training pairs and do RL
X_list, y_list, winners = make_training_pairs(player, opponent,
features,
args.game_batch,
board_size)
win_ratio = np.sum(np.array(winners) == 1) / float(args.game_batch)
metadata["win_ratio"][player_weights] = (opp_weights, win_ratio)
train_batch(player, X_list, y_list, winners, args.learning_rate)
# Save intermediate models
player_weights = "weights.%05d.hdf5" % i_iter
player.policy.model.save_weights(
os.path.join(args.out_directory, player_weights))
# add player to batch of oppenents once in a while
if i_iter % args.save_every == 0:
metadata["opponents"].append(player_weights)
save_metadata()
def handle_arguments(cmd_line_args=None):
"""Run generate data. command-line args may be passed in as a list
"""
import argparse
parser = argparse.ArgumentParser(
description='Play games used for training'
'value network (third phase of pipeline). '
'The final policy from the RL phase plays '
'against itself and training pairs for value '
'network are generated from the outcome in each '
'games, following an off-policy, uniform random move')
# required arguments
parser.add_argument(
"SL_weights_path",
help="Path to file with supervised learning policy weights."
) # noqa: E501
parser.add_argument(
"RL_weights_path",
help="Path to file with reinforcement learning policy weights."
) # noqa: E501
parser.add_argument("model_path",
help="Path to network architecture file.")
# optional arguments
parser.add_argument("--verbose",
"-v",
help="Turn on verbose mode",
default=False,
action="store_true") # noqa: E501
parser.add_argument(
"--outfile",
"-o",
help="Destination to write data (hdf5 file) Default: " +
DEFAULT_FILE_NAME,
default=DEFAULT_FILE_NAME) # noqa: E501
parser.add_argument(
"--sgf-path",
help="If set all sgf will be saved here. Default: None",
default=None) # noqa: E501
parser.add_argument(
"--n-training-pairs",
help="Number of training pairs to generate. Default: " +
str(DEFAULT_N_TRAINING_PAIRS),
type=int,
default=DEFAULT_N_TRAINING_PAIRS) # noqa: E501
parser.add_argument("--batch-size",
help="Number of games to run in parallel. Default: " +
str(DEFAULT_BATCH_SIZE),
type=int,
default=DEFAULT_BATCH_SIZE) # noqa: E501
parser.add_argument(
"--features",
"-f",
help=
"Comma-separated list of features to compute and store or 'all'. Default: all",
default='all') # noqa: E501
parser.add_argument(
"--sl-temperature",
help="Distribution temperature of players using SL policies. Default: "
+ str(DEFAULT_TEMPERATURE_SL),
type=float,
default=DEFAULT_TEMPERATURE_SL) # noqa: E501
parser.add_argument(
"--rl-temperature",
help="Distribution temperature of players using RL policies. Default: "
+ str(DEFAULT_TEMPERATURE_RL),
type=float,
default=DEFAULT_TEMPERATURE_RL) # noqa: E501
# show help or parse arguments
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
# list with features used for value network
# features = policy_SL.preprocessor.feature_list
if args.features.lower() == 'all':
features = [
"board", "ones", "turns_since", "liberties", "capture_size",
"self_atari_size", "liberties_after", "ladder_capture",
"ladder_escape", "sensibleness", "color"
]
else:
features = args.features.split(",")
# always add color feature
if "color" not in features:
features.append("color")
# Load SL architecture and weights from file
policy_SL = CNNPolicy.load_model(args.model_path)
policy_SL.model.load_weights(args.SL_weights_path)
# create SL player
player_SL = ProbabilisticPolicyPlayer(policy_SL,
temperature=args.sl_temperature,
move_limit=DEFAULT_MAX_GAME_DEPTH)
# Load RL architecture and weights from file
policy_RL = CNNPolicy.load_model(args.model_path)
policy_RL.model.load_weights(args.RL_weights_path)
# Create RL player
# TODO is it better to use greedy player?
player_RL = ProbabilisticPolicyPlayer(policy_RL,
temperature=args.rl_temperature,
move_limit=DEFAULT_MAX_GAME_DEPTH)
# check if folder exists
if args.sgf_path is not None and not os.path.exists(args.sgf_path):
os.makedirs(args.sgf_path)
# generate data
generate_data(player_RL, player_SL, args.outfile, args.n_training_pairs,
args.batch_size, policy_SL.model.input_shape[-1], features,
args.verbose, args.sgf_path)
def run_training(cmd_line_args=None):
import argparse
parser = argparse.ArgumentParser(
description=
'Perform reinforcement learning to improve given policy network. Second phase of pipeline.'
) # noqa: E501
parser.add_argument("model_json", help="Path to policy model JSON.")
parser.add_argument(
"initial_weights",
help=
"Path to HDF5 file with inital weights (i.e. result of supervised training)."
) # noqa: E501
parser.add_argument(
"out_directory",
help=
"Path to folder where the model params and metadata will be saved after each epoch."
) # noqa: E501
parser.add_argument("--learning-rate",
help="Keras learning rate (Default: 0.001)",
type=float,
default=0.001) # noqa: E501
parser.add_argument(
"--policy-temp",
help=
"Distribution temperature of players using policies (Default: 0.67)",
type=float,
default=0.67) # noqa: E501
parser.add_argument(
"--save-every",
help="Save policy as a new opponent every n batches (Default: 500)",
type=int,
default=500) # noqa: E501
parser.add_argument(
"--record-every",
help="Save learner's weights every n batches (Default: 1)",
type=int,
default=1) # noqa: E501
parser.add_argument("--game-batch",
help="Number of games per mini-batch (Default: 20)",
type=int,
default=20) # noqa: E501
parser.add_argument("--move-limit",
help="Maximum number of moves per game",
type=int,
default=500) # noqa: E501
parser.add_argument(
"--iterations",
help="Number of training batches/iterations (Default: 10000)",
type=int,
default=10000) # noqa: E501
parser.add_argument("--resume",
help="Load latest weights in out_directory and resume",
default=False,
action="store_true") # noqa: E501
parser.add_argument("--verbose",
"-v",
help="Turn on verbose mode",
default=False,
action="store_true") # noqa: E501
# Baseline function (TODO) default lambda state: 0 (receives either file
# paths to JSON and weights or None, in which case it uses default baseline 0)
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
ZEROTH_FILE = "weights.00000.hdf5"
if args.resume:
if not os.path.exists(os.path.join(args.out_directory,
"metadata.json")):
raise ValueError("Cannot resume without existing output directory")
if not os.path.exists(args.out_directory):
if args.verbose:
print("creating output directory {}".format(args.out_directory))
os.makedirs(args.out_directory)
if not args.resume:
# make a copy of weights file, "weights.00000.hdf5" in the output directory
copyfile(args.initial_weights,
os.path.join(args.out_directory, ZEROTH_FILE))
if args.verbose:
print("copied {} to {}".format(
args.initial_weights,
os.path.join(args.out_directory, ZEROTH_FILE)))
player_weights = ZEROTH_FILE
iter_start = 1
else:
# if resuming, we expect initial_weights to be just a
# "weights.#####.hdf5" file, not a full path
if not re.match(r"weights\.\d{5}\.hdf5", args.initial_weights):
raise ValueError(
"Expected to resume from weights file with name 'weights.#####.hdf5'"
)
args.initial_weights = os.path.join(
args.out_directory, os.path.basename(args.initial_weights))
if not os.path.exists(args.initial_weights):
raise ValueError("Cannot resume; weights {} do not exist".format(
args.initial_weights))
elif args.verbose:
print("Resuming with weights {}".format(args.initial_weights))
player_weights = os.path.basename(args.initial_weights)
iter_start = 1 + int(player_weights[8:13])
# Set initial conditions
policy = CNNPolicy.load_model(args.model_json)
policy.model.load_weights(args.initial_weights)
player = ProbabilisticPolicyPlayer(policy,
temperature=args.policy_temp,
move_limit=args.move_limit)
# different opponents come from simply changing the weights of 'opponent.policy.model'. That
# is, only 'opp_policy' needs to be changed, and 'opponent' will change.
opp_policy = CNNPolicy.load_model(args.model_json)
opponent = ProbabilisticPolicyPlayer(opp_policy,
temperature=args.policy_temp,
move_limit=args.move_limit)
if args.verbose:
print("created player and opponent with temperature {}".format(
args.policy_temp))
if not args.resume:
metadata = {
"model_file": args.model_json,
"init_weights": args.initial_weights,
"learning_rate": args.learning_rate,
"temperature": args.policy_temp,
"game_batch": args.game_batch,
"opponents":
[ZEROTH_FILE
], # which weights from which to sample an opponent each batch
"win_ratio":
{} # map from player to tuple of (opponent, win ratio) Useful for
# validating in lieu of 'accuracy/loss'
}
else:
with open(os.path.join(args.out_directory, "metadata.json"), "r") as f:
metadata = json.load(f)
# Append args of current run to history of full command args.
metadata["cmd_line_args"] = metadata.get("cmd_line_args", [])
metadata["cmd_line_args"].append(vars(args))
def save_metadata():
with open(os.path.join(args.out_directory, "metadata.json"), "w") as f:
json.dump(metadata, f, sort_keys=True, indent=2)
optimizer = SGD(lr=args.learning_rate)
player.policy.model.compile(loss=log_loss, optimizer=optimizer)
for i_iter in range(iter_start, args.iterations + 1):
# Note that player_weights will only be saved as a file every args.record_every iterations.
# Regardless, player_weights enters into the metadata to keep track of the win ratio over
# time.
player_weights = "weights.%05d.hdf5" % i_iter
# Randomly choose opponent from pool (possibly self), and playing
# game_batch games against them.
opp_weights = np.random.choice(metadata["opponents"])
opp_path = os.path.join(args.out_directory, opp_weights)
# Load new weights into opponent's network, but keep the same opponent object.
opponent.policy.model.load_weights(opp_path)
if args.verbose:
print("Batch {}\tsampled opponent is {}".format(
i_iter, opp_weights))
# Run games (and learn from results). Keep track of the win ratio vs each opponent over
# time.
win_ratio = run_n_games(optimizer, args.learning_rate, player,
opponent, args.game_batch)
metadata["win_ratio"][player_weights] = (opp_weights, win_ratio)
# Save intermediate models.
if i_iter % args.record_every == 0:
player.policy.model.save_weights(
os.path.join(args.out_directory, player_weights))
# Add player to batch of oppenents once in a while.
if i_iter % args.save_every == 0:
metadata["opponents"].append(player_weights)
save_metadata()
def run_training(cmd_line_args=None):
"""Run training. command-line args may be passed in as a list
"""
import argparse
parser = argparse.ArgumentParser(
description='Perform supervised training on a policy network.')
# required args
parser.add_argument(
"model",
help="Path to a JSON model file (i.e. from CNNPolicy.save_model())")
parser.add_argument("train_data", help="A .h5 file of training data")
parser.add_argument(
"out_directory",
help="directory where metadata and weights will be saved")
# frequently used args
parser.add_argument("--minibatch",
"-B",
help="Size of training data minibatches. Default: 16",
type=int,
default=16)
parser.add_argument(
"--epochs",
"-E",
help="Total number of iterations on the data. Default: 10",
type=int,
default=10)
parser.add_argument(
"--epoch-length",
"-l",
help=
"Number of training examples considered 'one epoch'. Default: # training data",
type=int,
default=None)
parser.add_argument(
"--learning-rate",
"-r",
help=
"Learning rate - how quickly the model learns at first. Default: .03",
type=float,
default=.03)
parser.add_argument(
"--decay",
"-d",
help="The rate at which learning decreases. Default: .0001",
type=float,
default=.0001)
parser.add_argument("--verbose",
"-v",
help="Turn on verbose mode",
default=False,
action="store_true")
# slightly fancier args
parser.add_argument(
"--weights",
help=
"Name of a .h5 weights file (in the output directory) to load to resume training",
default=None)
parser.add_argument(
"--train-val-test",
help=
"Fraction of data to use for training/val/test. Must sum to 1. Invalid if restarting training",
nargs=3,
type=float,
default=[0.93, .05, .02])
parser.add_argument(
"--symmetries",
help=
"Comma-separated list of transforms, subset of noop,rot90,rot180,rot270,fliplr,flipud,diag1,diag2",
default='noop,rot90,rot180,rot270,fliplr,flipud,diag1,diag2')
# TODO - an argument to specify which transformations to use, put it in metadata
if cmd_line_args is None:
args = parser.parse_args()
else:
args = parser.parse_args(cmd_line_args)
# TODO - what follows here should be refactored into a series of small functions
resume = args.weights is not None
if args.verbose:
if resume:
print("trying to resume from %s with weights %s" %
(args.out_directory,
os.path.join(args.out_directory, args.weights)))
else:
if os.path.exists(args.out_directory):
print(
"directory %s exists. any previous data will be overwritten"
% args.out_directory)
else:
print("starting fresh output directory %s" %
args.out_directory)
# load model from json spec
model = CNNPolicy.load_model(args.model).model
if resume:
model.load_weights(os.path.join(args.out_directory, args.weights))
# TODO - (waiting on game_converter) verify that features of model match features of training data
dataset = h5.File(args.train_data)
n_total_data = len(dataset["states"])
n_train_data = int(args.train_val_test[0] * n_total_data)
n_val_data = int(args.train_val_test[1] * n_total_data)
# n_test_data = n_total_data - (n_train_data + n_val_data)
if args.verbose:
print("datset loaded")
print("\t%d total samples" % n_total_data)
print("\t%d training samples" % n_train_data)
print("\t%d validaion samples" % n_val_data)
# ensure output directory is available
if not os.path.exists(args.out_directory):
os.makedirs(args.out_directory)
# create metadata file and the callback object that will write to it
meta_file = os.path.join(args.out_directory, "metadata.json")
meta_writer = MetadataWriterCallback(meta_file)
# load prior data if it already exists
if os.path.exists(meta_file) and resume:
with open(meta_file, "r") as f:
meta_writer.metadata = json.load(f)
if args.verbose:
print(
"previous metadata loaded: %d epochs. new epochs will be appended."
% len(meta_writer.metadata["epochs"]))
elif args.verbose:
print("starting with empty metadata")
# the MetadataWriterCallback only sets 'epoch' and 'best_epoch'. We can add in anything else we like here
# TODO - model and train_data are saved in meta_file; check that they match (and make args optional when restarting?)
meta_writer.metadata["training_data"] = args.train_data
meta_writer.metadata["model_file"] = args.model
# create ModelCheckpoint to save weights every epoch
checkpoint_template = os.path.join(args.out_directory,
"weights.{epoch:05d}.hdf5")
checkpointer = ModelCheckpoint(checkpoint_template)
# load precomputed random-shuffle indices or create them
# TODO - save each train/val/test indices separately so there's no danger of
# changing args.train_val_test when resuming
shuffle_file = os.path.join(args.out_directory, "shuffle.npz")
if os.path.exists(shuffle_file) and resume:
with open(shuffle_file, "r") as f:
shuffle_indices = np.load(f)
if args.verbose:
print("loading previous data shuffling indices")
else:
# create shuffled indices
shuffle_indices = np.random.permutation(n_total_data)
with open(shuffle_file, "w") as f:
np.save(f, shuffle_indices)
if args.verbose:
print("created new data shuffling indices")
# training indices are the first consecutive set of shuffled indices, val next, then test gets the remainder
train_indices = shuffle_indices[0:n_train_data]
val_indices = shuffle_indices[n_train_data:n_train_data + n_val_data]
# test_indices = shuffle_indices[n_train_data + n_val_data:]
symmetries = [
BOARD_TRANSFORMATIONS[name]
for name in args.symmetries.strip().split(",")
]
# create dataset generators
train_data_generator = shuffled_hdf5_batch_generator(
dataset["states"], dataset["actions"], train_indices, args.minibatch,
symmetries)
val_data_generator = shuffled_hdf5_batch_generator(dataset["states"],
dataset["actions"],
val_indices,
args.minibatch,
symmetries)
sgd = SGD(lr=args.learning_rate, decay=args.decay)
model.compile(loss='categorical_crossentropy',
optimizer=sgd,
metrics=["accuracy"])
samples_per_epoch = args.epoch_length or n_train_data
if args.verbose:
print("STARTING TRAINING")
model.fit_generator(generator=train_data_generator,
samples_per_epoch=samples_per_epoch,
nb_epoch=args.epochs,
callbacks=[checkpointer, meta_writer],
validation_data=val_data_generator,
nb_val_samples=n_val_data)