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February 21, 2019 13:09
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強化学習サンプル MountainCar-v0
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from keras.models import Sequential | |
from keras.layers import Dense, Activation, Flatten | |
from keras.optimizers import Adam | |
import gym | |
from rl.agents.dqn import DQNAgent | |
from rl.policy import EpsGreedyQPolicy | |
from rl.memory import SequentialMemory | |
env = gym.make('MountainCar-v0') | |
nb_actions = env.action_space.n | |
model = Sequential() | |
model.add(Flatten(input_shape=(1,) + env.observation_space.shape)) | |
model.add(Dense(16)) | |
model.add(Activation('relu')) | |
model.add(Dense(16)) | |
model.add(Activation('relu')) | |
model.add(Dense(16)) | |
model.add(Activation('relu')) | |
model.add(Dense(nb_actions)) | |
model.add(Activation('linear')) | |
memory = SequentialMemory(limit=50000, window_length=1) | |
policy = EpsGreedyQPolicy(eps=0.001) | |
dqn = DQNAgent(model=model, nb_actions=nb_actions,gamma=0.99, memory=memory, nb_steps_warmup=10, | |
target_model_update=1e-2, policy=policy) | |
dqn.compile(Adam(lr=1e-3), metrics=['mae']) | |
history = dqn.fit(env, nb_steps=50000, visualize=False, verbose=2) | |
dqn.test(env, nb_episodes=1, visualize=True) | |
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