[Tutorial Error] '3. Creating New RL Environment' - 'CartpoleTask' object has no attribute 'reset'

Omniverse Isaac Sim
1

Hi, while I’m running the code in the tutorial ‘3. Creating New RL Environment’, an error happens.

Error

Wrapping the env with a Monitor wrapper
Wrapping the env in a DummyVecEnv.
Traceback (most recent call last):
File “cartpole_example.py”, line 26, in
model.learn(total_timesteps=100000)
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/kit/python/lib/python3.7/site-packages/stable_baselines3/ppo/ppo.py”, line 313, in learn
reset_num_timesteps=reset_num_timesteps,
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/kit/python/lib/python3.7/site-packages/stable_baselines3/common/on_policy_algorithm.py”, line 243, in learn
total_timesteps, eval_env, callback, eval_freq, n_eval_episodes, eval_log_path, reset_num_timesteps, tb_log_name
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/kit/python/lib/python3.7/site-packages/stable_baselines3/common/base_class.py”, line 429, in _setup_learn
self._last_obs = self.env.reset() # pytype: disable=annotation-type-mismatch
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/kit/python/lib/python3.7/site-packages/stable_baselines3/common/vec_env/dummy_vec_env.py”, line 61, in reset
obs = self.envs[env_idx].reset()
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/kit/python/lib/python3.7/site-packages/stable_baselines3/common/monitor.py”, line 79, in reset
return self.env.reset(**kwargs)
File “/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/exts/omni.isaac.gym/omni/isaac/gym/vec_env/vec_env_base.py”, line 130, in reset
self._task.reset()
AttributeError: ‘CartpoleTask’ object has no attribute ‘reset’
/home/jong/.local/share/ov/pkg/isaac_sim-2022.1.0/python.sh: line 46: 247039 Segmentation fault (core dumped) $python_exe “$@” $args
There was an error running python

Environment
Isaac Sim 2022.1 on Ubuntu 20.04, installed by Omniverse Launcher
For VSCode and ./python.sh, the same error happens.

Log
log.txt (15.2 KB)

4

Hi,

Please make sure you have copied in the reset method into your CartpoleTask class. It should be the 7th code snippet under 6. Custom RL Example using Stable Baselines — Omniverse Robotics documentation.

Thanks,
Kelly

5

Hi~

I copied already the code you commented.

And, I made the codes again as below:
cartpole_task.py (5.7 KB)
cartpole_example.py (669 Bytes)

But the same error happened:
log.txt (15.3 KB)

Thanks

6

All of the methods in the cartpole_task.py script are for the CartpoleTask class. It looks like the indentation in your script is not set up correctly. Try adding an indentation to each method (other than __init__) so that they belong to the class.

Thanks,
Kelly

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