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ES bipedal
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# Evolution Strategies BipedalWalker-v2 | |
# https://blog.openai.com/evolution-strategies/ | |
# gives good solution at around iter 100 in 5 minutes | |
# for testing model set reload=True | |
import gym | |
import numpy as np | |
import cPickle as pickle | |
import sys | |
env = gym.make('BipedalWalker-v2') | |
np.random.seed(10) | |
hl_size = 100 | |
version = 1 | |
npop = 50 | |
sigma = 0.1 | |
alpha = 0.03 | |
iter_num = 300 | |
aver_reward = None | |
allow_writing = True | |
reload = False | |
print(hl_size, version, npop, sigma, alpha, iter_num) | |
if reload: | |
model = pickle.load(open('model-pedal%d.p' % version, 'rb')) | |
else: | |
model = {} | |
model['W1'] = np.random.randn(24, hl_size) / np.sqrt(24) | |
model['W2'] = np.random.randn(hl_size, 4) / np.sqrt(hl_size) | |
def get_action(state, model): | |
hl = np.matmul(state, model['W1']) | |
hl = np.tanh(hl) | |
action = np.matmul(hl, model['W2']) | |
action = np.tanh(action) | |
return action | |
def f(model, render=False): | |
state = env.reset() | |
total_reward = 0 | |
for t in range(iter_num): | |
if render: env.render() | |
action = get_action(state, model) | |
state, reward, done, info = env.step(action) | |
total_reward += reward | |
if done: | |
break | |
return total_reward | |
if reload: | |
iter_num = 10000 | |
for i_episode in range(10): | |
print(f(model, True)) | |
sys.exit('demo finished') | |
for i in range(10001): | |
N = {} | |
for k, v in model.iteritems(): | |
N[k] = np.random.randn(npop, v.shape[0], v.shape[1]) | |
R = np.zeros(npop) | |
for j in range(npop): | |
model_try = {} | |
for k, v in model.iteritems(): | |
model_try[k] = v + sigma*N[k][j] | |
R[j] = f(model_try) | |
A = (R - np.mean(R)) / np.std(R) | |
for k in model: | |
model[k] = model[k] + alpha/(npop*sigma) * np.dot(N[k].transpose(1, 2, 0), A) | |
cur_reward = f(model) | |
aver_reward = aver_reward * 0.9 + cur_reward * 0.1 if aver_reward != None else cur_reward | |
print('iter %d, cur_reward %.2f, aver_reward %.2f' % (i, cur_reward, aver_reward)) | |
if i % 10 == 0 and allow_writing: | |
pickle.dump(model, open('model-pedal%d.p' % version, 'wb')) |
When I run the code it shows an error
Traceback (most recent call last):
File "test.py", line 69, in
for k, v in model.iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'
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Extremely impressive solution to the Bipedal Walker with less than 80 lines of code!
How many episodes of training does it take to solve the BipedalWalker environment with a reward of +300?