在Keras中進行遷移式強化學習可以通過以下步驟實現(xiàn):
from keras.models import Model
from keras.layers import Dense, Input
from keras.optimizers import Adam
from keras.applications import VGG16
from rl.agents.dqn import DQNAgent
from rl.policy import BoltzmannQPolicy
from rl.memory import SequentialMemory
env = gym.make('your_environment')
np.random.seed(123)
env.seed(123)
nb_actions = env.action_space.n
input_shape = env.observation_space.shape
input_tensor = Input(shape=input_shape)
base_model = VGG16(include_top=False, input_tensor=input_tensor)
x = base_model.output
x = Dense(512, activation='relu')(x)
x = Dense(nb_actions, activation='linear')(x)
model = Model(inputs=base_model.input, outputs=x)
model.compile(optimizer=Adam(lr=1e-4), loss='mse')
memory = SequentialMemory(limit=10000, window_length=1)
policy = BoltzmannQPolicy()
dqn = DQNAgent(model=model, nb_actions=nb_actions, memory=memory, policy=policy,
nb_steps_warmup=1000, target_model_update=1e-2)
dqn.compile(Adam(lr=1e-3), metrics=['mae'])
dqn.fit(env, nb_steps=50000, visualize=False, verbose=2)
通過以上步驟,您就可以在Keras中實現(xiàn)遷移式強化學習了。記得根據(jù)您的具體問題和環(huán)境進行適當?shù)恼{(diào)整和優(yōu)化。