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%% Cell type:code id: tags:
```
!pip install torch
```
%% Output
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%% Cell type:code id: tags:
```
!pip install gym==0.26.2
!pip install pyglet==2.0.10
!pip install pygame==2.5.2
!pip install PyQt5
```
%% Output
Collecting gym==0.26.2
Downloading gym-0.26.2.tar.gz (721 kB)
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[?25h Installing build dependencies ... [?25l[?25hdone
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Building wheels for collected packages: gym
Building wheel for gym (pyproject.toml) ... [?25l[?25hdone
Created wheel for gym: filename=gym-0.26.2-py3-none-any.whl size=827620 sha256=c0e52d00d327e4107d9d7487856d18889281e05f722af341747342271291b415
Stored in directory: /root/.cache/pip/wheels/b9/22/6d/3e7b32d98451b4cd9d12417052affbeeeea012955d437da1da
Successfully built gym
Installing collected packages: gym
Attempting uninstall: gym
Found existing installation: gym 0.25.2
Uninstalling gym-0.25.2:
Successfully uninstalled gym-0.25.2
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
dopamine-rl 4.0.6 requires gym<=0.25.2, but you have gym 0.26.2 which is incompatible.
Successfully installed gym-0.26.2
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[?25hInstalling collected packages: PyQt5-Qt5, PyQt5-sip, PyQt5
Successfully installed PyQt5-5.15.10 PyQt5-Qt5-5.15.2 PyQt5-sip-12.13.0
%% Cell type:markdown id: tags:
The REINFORCE algorithm (also known as Vanilla Policy Gradient) is a policy gradient method that optimizes the policy directly using gradient descent. The following is the pseudocode of the REINFORCE algorithm:
%% Cell type:markdown id: tags:
**Setup the CartPole environment**
**Setup the agent as a simple neural network with:**
- One fully connected layer with 128 units and ReLU activation followed by a dropout layer
- One fully connected layer followed by softmax activation
**Repeat 500 times:**
Reset the environment
Reset the buffer
Repeat until the end of the episode:
- Compute action probabilities
- Sample the action based on the probabilities and
store its probability in the buffer
- Step the environment with the action
- Compute and store in the buffer the return using gamma=0.99
Normalize the return
Compute the policy loss as -sum(log(prob) * return)
Update the policy using an Adam optimizer and a learning rate of 5e-3
%% Cell type:code id: tags:
```
import gym, pygame, numpy as np, matplotlib.pyplot as plt
import torch, torch.nn as nn, torch.nn.functional as F, torch.optim as optim
from torch.distributions import Categorical
# Setup the CartPole environment
env = gym.make("CartPole-v1", render_mode="human")
# Setup the agent as a simple neural network
class Agent(nn.Module) :
def __init__(self) :
super(Agent, self).__init__()
self.FC1 = nn.Linear(env.observation_space.shape[0], 128)
self.FC2 = nn.Linear(128, env.action_space.n)
def forward(self, x) :
x = self.FC1(x)
x = F.relu(x)
x = F.dropout(x)
x = self.FC2(x)
x = F.softmax(x, dim=1)
return x
# Creation of the agent
agent = Agent()
rewards_tot = []
# Repeat 500 times
for i in range(500):
# Reset the environment
obs = env.reset()
obs = obs[0] if isinstance(obs, tuple) else obs
# Reset the buffer
rewards, log_probs_list, terminated, step = [], [], False, 0
# Repeat until the end of the episode
while terminated == False and step < 500:
step += 1
# Compute action probabilities
obs_tensor = torch.FloatTensor(obs).unsqueeze(0)
log_probs = agent(obs_tensor)
probs = torch.exp(log_probs)
# Sample the action based on the probabilities and store probability
action = torch.multinomial(probs, 1).item()
# Step the environment with the action
new_obs, reward, terminated, _ = env.step(action)
env.render()
# Compute and store the return in the buffer
rewards.append(reward)
log_probs_list.append(log_probs[0, action])
obs = new_obs
# Normalize the return
R = 0
returns = []
for r_i in rewards[::-1] :
R = r_i + 0.99*R
returns.insert(0, R)
returns = torch.tensor(returns)
returns = 1/(returns.std(dim=0) + 1e-9) * (returns - returns.mean(dim=0))
rewards_tot.append(sum(rewards))
# Compute the policy loss
loss = -torch.sum(torch.stack(log_probs_list) * torch.FloatTensor(returns))
# Update policy with an Adam optimizer
optimizer = optim.Adam(agent.parameters(), lr=5e-3)
optimizer.zero_grad()
loss.backward()
optimizer.step()
# Close the environment
env.close()
# Reward plot
plt.figure()
plt.plot(rewards_tot)
plt.xlabel('Episode')
plt.ylabel('Reward')
plt.title('Reinforcement rewards')
plt.show()
```
%% Output
%% Cell type:markdown id: tags:
We can see that even if the average reward per episode increases, it does not reach the max reward value, and still oscillates much after 500 episodes.
%% Cell type:markdown id: tags:
**Familiarization with a complete RL pipeline: Application to training a robotic arm**
In this section, you will use the Stable-Baselines3 package to train a robotic arm using RL. You'll get familiar with several widely-used tools for training, monitoring and sharing machine learning models.
%% Cell type:code id: tags:
```
!pip install stable-baselines3
!pip install moviepy
!pip install huggingface-sb3==2.3.1
!pip install wandb
```
%% Output
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%% Cell type:code id: tags:
```
import wandb, gymnasium as gym
from stable_baselines3 import A2C
from stable_baselines3.common.evaluation import evaluate_policy
from huggingface_hub import hf_api
from wandb.integration.sb3 import WandbCallback
# Setup the Cartpole environment
env = gym.make("CartPole-v1", render_mode="rgb_array")
# Choosing the model
model = A2C("MlpPolicy", env, verbose=1)
# Printing initial reward
reward_before_moy, _ = evaluate_policy(model, env, n_eval_episodes=10)
print(f"Mean reward before training: {reward_before_moy:.2f}")
# Model training during 10000 timesteps
model.learn(total_timesteps=10_000)
# Printing reward after training
reward_after_moy, _ = evaluate_policy(model, env, n_eval_episodes=10)
print(f"Mean reward after training: {reward_after_moy:.2f}")
# Upload and save model
# Saving the trained model
model_save_path = "model"
model.save(model_save_path)
model_path = "model.zip"
# Creating repository
repo_name="BE-RL"
rep = hf_api.create_repo(token="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", repo_id=repo_name)
# Uploading model in repository
repo_id="hchauvin78/BE-RL"
hf_api.upload_file(token="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", repo_id=repo_id, path_or_fileobj=model_path, path_in_repo=repo_name)
# Training with WandB
# Initializing WandB
wandb.init(project="cartpole-training", entity="hchauvin78", anonymous="allow")
#Configuring WandB
config = wandb.config
config.learning_rate = 0.001
config.gamma = 0.99
config.n_steps = 500
#Monitoring model training with WandB
model = A2C('MlpPolicy', env, verbose=1, tensorboard_log="logs/")
episode_rewards = []
for i in range(25000):
obs = env.reset()[0]
reward_tot = 0
terminated = False
while terminated == False:
action, _ = model.predict(obs, deterministic=True)
obs, reward, terminated, info, _ = env.step(action)
reward_tot += reward
episode_rewards.append(reward_tot)
wandb.log({"Episode Reward": reward_tot, "Episode": i})
#Log mean reward every 10 episodes
if i % 10 == 0:
mean_reward = sum(episode_rewards[-10:]) / 10
wandb.log({"Mean Reward": mean_reward})
#Log final metrics to WandB
wandb.log({"Mean Reward": mean_reward})
#Finish WandB run
wandb.finish()
```
%% Output
Using cpu device
Wrapping the env with a `Monitor` wrapper
Wrapping the env in a DummyVecEnv.
Mean reward before training: 355.20
------------------------------------
| rollout/ | |
| ep_len_mean | 31.5 |
| ep_rew_mean | 31.5 |
| time/ | |
| fps | 398 |
| iterations | 100 |
| time_elapsed | 1 |
| total_timesteps | 500 |
| train/ | |
| entropy_loss | -0.574 |
| explained_variance | 0.669 |
| learning_rate | 0.0007 |
| n_updates | 99 |
| policy_loss | 1.52 |
| value_loss | 6.1 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 30.2 |
| ep_rew_mean | 30.2 |
| time/ | |
| fps | 470 |
| iterations | 200 |
| time_elapsed | 2 |
| total_timesteps | 1000 |
| train/ | |
| entropy_loss | -0.517 |
| explained_variance | -0.893 |
| learning_rate | 0.0007 |
| n_updates | 199 |
| policy_loss | 2.03 |
| value_loss | 11.1 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 31.7 |
| ep_rew_mean | 31.7 |
| time/ | |
| fps | 504 |
| iterations | 300 |
| time_elapsed | 2 |
| total_timesteps | 1500 |
| train/ | |
| entropy_loss | -0.574 |
| explained_variance | 0.197 |
| learning_rate | 0.0007 |
| n_updates | 299 |
| policy_loss | 0.67 |
| value_loss | 3.55 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 32.3 |
| ep_rew_mean | 32.3 |
| time/ | |
| fps | 525 |
| iterations | 400 |
| time_elapsed | 3 |
| total_timesteps | 2000 |
| train/ | |
| entropy_loss | -0.517 |
| explained_variance | -0.0114 |
| learning_rate | 0.0007 |
| n_updates | 399 |
| policy_loss | 1.48 |
| value_loss | 6.36 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 32.8 |
| ep_rew_mean | 32.8 |
| time/ | |
| fps | 535 |
| iterations | 500 |
| time_elapsed | 4 |
| total_timesteps | 2500 |
| train/ | |
| entropy_loss | -0.494 |
| explained_variance | -0.0975 |
| learning_rate | 0.0007 |
| n_updates | 499 |
| policy_loss | 0.907 |
| value_loss | 5.78 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 34.7 |
| ep_rew_mean | 34.7 |
| time/ | |
| fps | 541 |
| iterations | 600 |
| time_elapsed | 5 |
| total_timesteps | 3000 |
| train/ | |
| entropy_loss | -0.447 |
| explained_variance | -0.00207 |
| learning_rate | 0.0007 |
| n_updates | 599 |
| policy_loss | 1.28 |
| value_loss | 4.87 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 35.5 |
| ep_rew_mean | 35.5 |
| time/ | |
| fps | 544 |
| iterations | 700 |
| time_elapsed | 6 |
| total_timesteps | 3500 |
| train/ | |
| entropy_loss | -0.302 |
| explained_variance | 0.0436 |
| learning_rate | 0.0007 |
| n_updates | 699 |
| policy_loss | 1.57 |
| value_loss | 4.52 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 36.8 |
| ep_rew_mean | 36.8 |
| time/ | |
| fps | 549 |
| iterations | 800 |
| time_elapsed | 7 |
| total_timesteps | 4000 |
| train/ | |
| entropy_loss | -0.256 |
| explained_variance | -0.00302 |
| learning_rate | 0.0007 |
| n_updates | 799 |
| policy_loss | 1.88 |
| value_loss | 4.09 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 38.6 |
| ep_rew_mean | 38.6 |
| time/ | |
| fps | 552 |
| iterations | 900 |
| time_elapsed | 8 |
| total_timesteps | 4500 |
| train/ | |
| entropy_loss | -0.229 |
| explained_variance | 0.037 |
| learning_rate | 0.0007 |
| n_updates | 899 |
| policy_loss | 1.99 |
| value_loss | 3.64 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 40.3 |
| ep_rew_mean | 40.3 |
| time/ | |
| fps | 556 |
| iterations | 1000 |
| time_elapsed | 8 |
| total_timesteps | 5000 |
| train/ | |
| entropy_loss | -0.42 |
| explained_variance | 4.21e-05 |
| learning_rate | 0.0007 |
| n_updates | 999 |
| policy_loss | -4.77 |
| value_loss | 1.13e+03 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 42.5 |
| ep_rew_mean | 42.5 |
| time/ | |
| fps | 558 |
| iterations | 1100 |
| time_elapsed | 9 |
| total_timesteps | 5500 |
| train/ | |
| entropy_loss | -0.473 |
| explained_variance | 4.71e-06 |
| learning_rate | 0.0007 |
| n_updates | 1099 |
| policy_loss | 0.298 |
| value_loss | 2.76 |
------------------------------------
-------------------------------------
| rollout/ | |
| ep_len_mean | 44.3 |
| ep_rew_mean | 44.3 |
| time/ | |
| fps | 561 |
| iterations | 1200 |
| time_elapsed | 10 |
| total_timesteps | 6000 |
| train/ | |
| entropy_loss | -0.384 |
| explained_variance | -0.000385 |
| learning_rate | 0.0007 |
| n_updates | 1199 |
| policy_loss | 0.415 |
| value_loss | 2.35 |
-------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 46.4 |
| ep_rew_mean | 46.4 |
| time/ | |
| fps | 559 |
| iterations | 1300 |
| time_elapsed | 11 |
| total_timesteps | 6500 |
| train/ | |
| entropy_loss | -0.342 |
| explained_variance | 0.000243 |
| learning_rate | 0.0007 |
| n_updates | 1299 |
| policy_loss | 0.578 |
| value_loss | 1.93 |
------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 52 |
| ep_rew_mean | 52 |
| time/ | |
| fps | 548 |
| iterations | 1400 |
| time_elapsed | 12 |
| total_timesteps | 7000 |
| train/ | |
| entropy_loss | -0.352 |
| explained_variance | 0.00346 |
| learning_rate | 0.0007 |
| n_updates | 1399 |
| policy_loss | 0.887 |
| value_loss | 1.55 |
------------------------------------
-------------------------------------
| rollout/ | |
| ep_len_mean | 55.2 |
| ep_rew_mean | 55.2 |
| time/ | |
| fps | 539 |
| iterations | 1500 |
| time_elapsed | 13 |
| total_timesteps | 7500 |
| train/ | |
| entropy_loss | -0.518 |
| explained_variance | -0.000267 |
| learning_rate | 0.0007 |
| n_updates | 1499 |
| policy_loss | 0.277 |
| value_loss | 1.21 |
-------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 60.7 |
| ep_rew_mean | 60.7 |
| time/ | |
| fps | 529 |
| iterations | 1600 |
| time_elapsed | 15 |
| total_timesteps | 8000 |
| train/ | |
| entropy_loss | -0.456 |
| explained_variance | 0.000455 |
| learning_rate | 0.0007 |
| n_updates | 1599 |
| policy_loss | 0.236 |
| value_loss | 0.918 |
------------------------------------
-------------------------------------
| rollout/ | |
| ep_len_mean | 64.2 |
| ep_rew_mean | 64.2 |
| time/ | |
| fps | 531 |
| iterations | 1700 |
| time_elapsed | 15 |
| total_timesteps | 8500 |
| train/ | |
| entropy_loss | -0.397 |
| explained_variance | -0.000141 |
| learning_rate | 0.0007 |
| n_updates | 1699 |
| policy_loss | 0.27 |
| value_loss | 0.668 |
-------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 67.1 |
| ep_rew_mean | 67.1 |
| time/ | |
| fps | 534 |
| iterations | 1800 |
| time_elapsed | 16 |
| total_timesteps | 9000 |
| train/ | |
| entropy_loss | -0.412 |
| explained_variance | 6.56e-07 |
| learning_rate | 0.0007 |
| n_updates | 1799 |
| policy_loss | 0.417 |
| value_loss | 0.45 |
------------------------------------
-------------------------------------
| rollout/ | |
| ep_len_mean | 75.1 |
| ep_rew_mean | 75.1 |
| time/ | |
| fps | 536 |
| iterations | 1900 |
| time_elapsed | 17 |
| total_timesteps | 9500 |
| train/ | |
| entropy_loss | -0.365 |
| explained_variance | -1.88e-05 |
| learning_rate | 0.0007 |
| n_updates | 1899 |
| policy_loss | 0.139 |
| value_loss | 0.274 |
-------------------------------------
------------------------------------
| rollout/ | |
| ep_len_mean | 79.9 |
| ep_rew_mean | 79.9 |
| time/ | |
| fps | 538 |
| iterations | 2000 |
| time_elapsed | 18 |
| total_timesteps | 10000 |
| train/ | |
| entropy_loss | -0.356 |
| explained_variance | 5.39e-05 |
| learning_rate | 0.0007 |
| n_updates | 1999 |
| policy_loss | 0.101 |
| value_loss | 0.148 |
------------------------------------
Mean reward after training: 256.70
/usr/local/lib/python3.10/dist-packages/notebook/utils.py:280: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
return LooseVersion(v) >= LooseVersion(check)
wandb: (1) Private W&B dashboard, no account required
wandb: (2) Use an existing W&B account
wandb: Enter your choice: 1
wandb: You chose 'Private W&B dashboard, no account required'
wandb: Appending key for api.wandb.ai to your netrc file: /root/.netrc
Problem at: <ipython-input-28-b66b1c5d0647> 35 <cell line: 35>
---------------------------------------------------------------------------
CommError Traceback (most recent call last)
<ipython-input-28-b66b1c5d0647> in <cell line: 35>()
33 # Training with WandB
34 # Initializing WandB
---> 35 wandb.init(project="cartpole-training", entity="hchauvin78", anonymous="allow")
36
37 #Configuring WandB
/usr/local/lib/python3.10/dist-packages/wandb/sdk/wandb_init.py in init(job_type, dir, config, project, entity, reinit, tags, group, name, notes, magic, config_exclude_keys, config_include_keys, anonymous, mode, allow_val_change, resume, force, tensorboard, sync_tensorboard, monitor_gym, save_code, id, settings)
1193 if logger is not None:
1194 logger.exception(str(e))
-> 1195 raise e
1196 except KeyboardInterrupt as e:
1197 assert logger
/usr/local/lib/python3.10/dist-packages/wandb/sdk/wandb_init.py in init(job_type, dir, config, project, entity, reinit, tags, group, name, notes, magic, config_exclude_keys, config_include_keys, anonymous, mode, allow_val_change, resume, force, tensorboard, sync_tensorboard, monitor_gym, save_code, id, settings)
1174 except_exit = wi.settings._except_exit
1175 try:
-> 1176 run = wi.init()
1177 except_exit = wi.settings._except_exit
1178 except (KeyboardInterrupt, Exception) as e:
/usr/local/lib/python3.10/dist-packages/wandb/sdk/wandb_init.py in init(self)
783 backend.cleanup()
784 self.teardown()
--> 785 raise error
786
787 assert run_result is not None # for mypy
CommError: It appears that you do not have permission to access the requested resource. Please reach out to the project owner to grant you access. If you have the correct permissions, verify that there are no issues with your networking setup.(Error 404: Not Found)
%% Cell type:markdown id: tags:
I am struggling to access my Hugging Face account even though I generated tokens... as I cannot understand what is happening I will stop there :'(
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