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# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
import mxnet as mx
import mxnet.ndarray as nd
import numpy
import time
import argparse
import os
import re
import logging
import sys
from base import Base
from atari_game import AtariGame
from utils import *
from operators import *
root = logging.getLogger()
root.setLevel(logging.DEBUG)
ch = logging.StreamHandler(sys.stdout)
ch.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
ch.setFormatter(formatter)
root.addHandler(ch)
npy_rng = get_numpy_rng()
def collect_holdout_samples(game, num_steps=3200, sample_num=3200):
print("Begin Collecting Holdout Samples...")
game.force_restart()
game.begin_episode()
for i in range(num_steps):
if game.episode_terminate:
game.begin_episode()
action = npy_rng.randint(len(game.action_set))
game.play(action)
samples, _, _, _, _ = game.replay_memory.sample(batch_size=sample_num)
print("Done!")
return samples
def calculate_avg_q(samples, qnet):
total_q = 0.0
for i in range(len(samples)):
state = nd.array(samples[i:i + 1], ctx=qnet.ctx) / float(255.0)
total_q += qnet.forward(is_train=False, data=state)[0].asnumpy().max(axis=1).sum()
avg_q_score = total_q / float(len(samples))
return avg_q_score
def calculate_avg_reward(game, qnet, test_steps=125000, exploartion=0.05):
game.force_restart()
action_num = len(game.action_set)
total_reward = 0
steps_left = test_steps
episode = 0
while steps_left > 0:
# Running New Episode
episode += 1
episode_q_value = 0.0
game.begin_episode(steps_left)
start = time.time()
while not game.episode_terminate:
# 1. We need to choose a new action based on the current game status
if game.state_enabled:
do_exploration = (npy_rng.rand() < exploartion)
if do_exploration:
action = npy_rng.randint(action_num)
else:
# TODO Here we can in fact play multiple gaming instances simultaneously and make actions for each
# We can simply stack the current_state() of gaming instances and give prediction for all of them
# We need to wait after calling calc_score(.), which makes the program slow
# TODO Profiling the speed of this part!
current_state = game.current_state()
state = nd.array(current_state.reshape((1,) + current_state.shape),
ctx=qnet.ctx) / float(255.0)
action = nd.argmax_channel(
qnet.forward(is_train=False, data=state)[0]).asscalar()
else:
action = npy_rng.randint(action_num)
# 2. Play the game for a single mega-step (Inside the game, the action may be repeated for several times)
game.play(action)
end = time.time()
steps_left -= game.episode_step
print('Episode:%d, FPS:%s, Steps Left:%d, Reward:%d' \
% (episode, game.episode_step / (end - start), steps_left, game.episode_reward))
total_reward += game.episode_reward
avg_reward = total_reward / float(episode)
return avg_reward
def main():
parser = argparse.ArgumentParser(description='Script to test the trained network on a game.')
parser.add_argument('-r', '--rom', required=False, type=str,
default=os.path.join('roms', 'breakout.bin'),
help='Path of the ROM File.')
parser.add_argument('-d', '--dir-path', required=False, type=str, default='',
help='Directory path of the model files.')
parser.add_argument('-m', '--model_prefix', required=True, type=str, default='QNet',
help='Prefix of the saved model file.')
parser.add_argument('-t', '--test-steps', required=False, type=int, default=125000,
help='Test steps.')
parser.add_argument('-c', '--ctx', required=False, type=str, default='gpu',
help='Running Context. E.g `-c gpu` or `-c gpu1` or `-c cpu`')
parser.add_argument('-e', '--epoch-range', required=False, type=str, default='22',
help='Epochs to run testing. E.g `-e 0,80`, `-e 0,80,2`')
parser.add_argument('-v', '--visualization', required=False, type=int, default=0,
help='Visualize the runs.')
parser.add_argument('--symbol', required=False, type=str, default="nature",
help='type of network, nature or nips')
args, unknown = parser.parse_known_args()
max_start_nullops = 30
holdout_size = 3200
replay_memory_size = 1000000
exploartion = 0.05
history_length = 4
rows = 84
cols = 84
ctx = re.findall('([a-z]+)(\d*)', args.ctx)
ctx = [(device, int(num)) if len(num) >0 else (device, 0) for device, num in ctx]
q_ctx = mx.Context(*ctx[0])
minibatch_size = 32
epoch_range = [int(n) for n in args.epoch_range.split(',')]
epochs = range(*epoch_range)
game = AtariGame(rom_path=args.rom, history_length=history_length,
resize_mode='scale', resized_rows=rows, replay_start_size=4,
resized_cols=cols, max_null_op=max_start_nullops,
replay_memory_size=replay_memory_size,
death_end_episode=False,
display_screen=args.visualization)
if not args.visualization:
holdout_samples = collect_holdout_samples(game, sample_num=holdout_size)
action_num = len(game.action_set)
data_shapes = {'data': (minibatch_size, history_length) + (rows, cols),
'dqn_action': (minibatch_size,), 'dqn_reward': (minibatch_size,)}
if args.symbol == "nature":
dqn_sym = dqn_sym_nature(action_num)
elif args.symbol == "nips":
dqn_sym = dqn_sym_nips(action_num)
else:
raise NotImplementedError
qnet = Base(data_shapes=data_shapes, sym_gen=dqn_sym, name=args.model_prefix, ctx=q_ctx)
for epoch in epochs:
qnet.load_params(name=args.model_prefix, dir_path=args.dir_path, epoch=epoch)
if not args.visualization:
avg_q_score = calculate_avg_q(holdout_samples, qnet)
avg_reward = calculate_avg_reward(game, qnet, args.test_steps, exploartion)
print("Epoch:%d Avg Reward: %f, Avg Q Score:%f" % (epoch, avg_reward, avg_q_score))
else:
avg_reward = calculate_avg_reward(game, qnet, args.test_steps, exploartion)
print("Epoch:%d Avg Reward: %f" % (epoch, avg_reward))
if __name__ == '__main__':
main()