my brittle PPO implementation for Cartpole, how can I make it more resilient?
$begingroup$
I implemented the clipped objective PPO-clip as explained here: https://spinningup.openai.com/en/latest/algorithms/ppo.html
Basically I used a dummy actor network to find the new action probability without training the local actor network.
"""use temp_actor to get new prob so we don't update the actual actor until
we do the clip op"""
curr_weights = self.actor.get_weights()
self.temp_actor.set_weights(curr_weights)
self.temp_actor.fit(state, advantages, epochs=1, verbose=0)
new_policy = self.temp_actor.predict(state, batch_size=1).flatten()
new_aprob = new_policy[action]
Then I worked out the ratio of action probabilities and implemented the PPO clipping parts of the algorithm:
ratio = new_aprob / old_aprob
# scale = min(ratio * advantages, K.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages)
no_clip = ratio * advantages
clipped = np.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages
self.actor.fit(state, np.minimum(no_clip, clipped), epochs=1, verbose=0)
The full code is here (please excuse some coarse language in the comments): https://github.com/nyck33/openai_my_implements/blob/master/cartpole/my_ppo_cartpole.py
It seems to work but for Cartpole, slightly slower than my DQN and VPG implementations here: https://github.com/nyck33/openai_my_implements/tree/master/cartpole
The std deviation of returns seems a bit lower than with VPG or DQN so I'm guessing the clipping is stabilizing the learning somewhat. However, once I change the learning rates to anything else than what I currently have, it stops learning, ie. it's very brittle.
Thus, I'm looking for any advice here to make it more resilient.
deep-learning reinforcement-learning openai-gym
asked 21 hours ago
mLstudent33mLstudent33
507
$endgroup$
add a comment |
$begingroup$
I implemented the clipped objective PPO-clip as explained here: https://spinningup.openai.com/en/latest/algorithms/ppo.html
Basically I used a dummy actor network to find the new action probability without training the local actor network.
"""use temp_actor to get new prob so we don't update the actual actor until
we do the clip op"""
curr_weights = self.actor.get_weights()
self.temp_actor.set_weights(curr_weights)
self.temp_actor.fit(state, advantages, epochs=1, verbose=0)
new_policy = self.temp_actor.predict(state, batch_size=1).flatten()
new_aprob = new_policy[action]
Then I worked out the ratio of action probabilities and implemented the PPO clipping parts of the algorithm:
ratio = new_aprob / old_aprob
# scale = min(ratio * advantages, K.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages)
no_clip = ratio * advantages
clipped = np.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages
self.actor.fit(state, np.minimum(no_clip, clipped), epochs=1, verbose=0)
The full code is here (please excuse some coarse language in the comments): https://github.com/nyck33/openai_my_implements/blob/master/cartpole/my_ppo_cartpole.py
It seems to work but for Cartpole, slightly slower than my DQN and VPG implementations here: https://github.com/nyck33/openai_my_implements/tree/master/cartpole
The std deviation of returns seems a bit lower than with VPG or DQN so I'm guessing the clipping is stabilizing the learning somewhat. However, once I change the learning rates to anything else than what I currently have, it stops learning, ie. it's very brittle.
Thus, I'm looking for any advice here to make it more resilient.
deep-learning reinforcement-learning openai-gym
asked 21 hours ago
mLstudent33mLstudent33
507
$endgroup$
1
$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago
add a comment |
$begingroup$
I implemented the clipped objective PPO-clip as explained here: https://spinningup.openai.com/en/latest/algorithms/ppo.html
Basically I used a dummy actor network to find the new action probability without training the local actor network.
"""use temp_actor to get new prob so we don't update the actual actor until
we do the clip op"""
curr_weights = self.actor.get_weights()
self.temp_actor.set_weights(curr_weights)
self.temp_actor.fit(state, advantages, epochs=1, verbose=0)
new_policy = self.temp_actor.predict(state, batch_size=1).flatten()
new_aprob = new_policy[action]
Then I worked out the ratio of action probabilities and implemented the PPO clipping parts of the algorithm:
ratio = new_aprob / old_aprob
# scale = min(ratio * advantages, K.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages)
no_clip = ratio * advantages
clipped = np.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages
self.actor.fit(state, np.minimum(no_clip, clipped), epochs=1, verbose=0)
The full code is here (please excuse some coarse language in the comments): https://github.com/nyck33/openai_my_implements/blob/master/cartpole/my_ppo_cartpole.py
It seems to work but for Cartpole, slightly slower than my DQN and VPG implementations here: https://github.com/nyck33/openai_my_implements/tree/master/cartpole
The std deviation of returns seems a bit lower than with VPG or DQN so I'm guessing the clipping is stabilizing the learning somewhat. However, once I change the learning rates to anything else than what I currently have, it stops learning, ie. it's very brittle.
Thus, I'm looking for any advice here to make it more resilient.
deep-learning reinforcement-learning openai-gym
asked 21 hours ago
mLstudent33mLstudent33
507
$endgroup$
I implemented the clipped objective PPO-clip as explained here: https://spinningup.openai.com/en/latest/algorithms/ppo.html
Basically I used a dummy actor network to find the new action probability without training the local actor network.
"""use temp_actor to get new prob so we don't update the actual actor until
we do the clip op"""
curr_weights = self.actor.get_weights()
self.temp_actor.set_weights(curr_weights)
self.temp_actor.fit(state, advantages, epochs=1, verbose=0)
new_policy = self.temp_actor.predict(state, batch_size=1).flatten()
new_aprob = new_policy[action]
Then I worked out the ratio of action probabilities and implemented the PPO clipping parts of the algorithm:
ratio = new_aprob / old_aprob
# scale = min(ratio * advantages, K.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages)
no_clip = ratio * advantages
clipped = np.clip(ratio, 1 - self.epsilon, 1 + self.epsilon) * advantages
self.actor.fit(state, np.minimum(no_clip, clipped), epochs=1, verbose=0)
The full code is here (please excuse some coarse language in the comments): https://github.com/nyck33/openai_my_implements/blob/master/cartpole/my_ppo_cartpole.py
It seems to work but for Cartpole, slightly slower than my DQN and VPG implementations here: https://github.com/nyck33/openai_my_implements/tree/master/cartpole
The std deviation of returns seems a bit lower than with VPG or DQN so I'm guessing the clipping is stabilizing the learning somewhat. However, once I change the learning rates to anything else than what I currently have, it stops learning, ie. it's very brittle.
Thus, I'm looking for any advice here to make it more resilient.
deep-learning reinforcement-learning openai-gym
deep-learning reinforcement-learning openai-gym
asked 21 hours ago
mLstudent33mLstudent33
507
asked 21 hours ago
mLstudent33mLstudent33
507
edited 4 mins ago
mLstudent33
asked 21 hours ago
mLstudent33mLstudent33
507
asked 21 hours ago
mLstudent33mLstudent33
507
asked 21 hours ago
mLstudent33mLstudent33
507
507
1
$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago
add a comment |
1
$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago
1
1
$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago
add a comment |
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$begingroup$
Your question is not about code review by itself but about learning, you can remove that from your title and the last phrase as well since that is a second question (and a meta question) inside the question.
$endgroup$
– Pedro Henrique Monforte
11 hours ago
$begingroup$
@PedroHenriqueMonforte, sounds good! Had no idea what a meta question was until now but it makes sense.
$endgroup$
– mLstudent33
3 mins ago