No module named 'bark.core'

[ThomasChen98]

Hi. I tried to run the demo code to visualize "merging-v0" env but get an error on 'bark.core' not found. I used the bark package built from source on my own computer and I checked that there is no such folder in the latest bark repo.

The demo codes are as follows

import gym
import numpy as np
# registers bark-ml environments
import sys
sys.path.append('./bark_ml')
sys.path.append('/home/yuxin/bark')
import bark_ml.environments.gym  # pylint: disable=unused-import

env = gym.make("merging-v0")

initial_state = env.reset()
done = False
while done is False:
  action = np.array([0., 0.]) # acceleration and steering-rate
  observed_state, reward, done, info = env.step(action)
  print(f"Observed state: {observed_state}, "
        f"Action: {action}, Reward: {reward}, Done: {done}")

The error message is shown below:

Traceback (most recent call last):
  File "demo.py", line 7, in <module>
    import bark_ml.environments.gym  # pylint: disable=unused-import
  File "/home/yuxin/bark-ml/bark_ml/environments/__init__.py", line 1, in <module>
    from bark_ml.environments.single_agent_runtime import SingleAgentRuntime  # pylint: disable=unused-import
  File "/home/yuxin/bark-ml/bark_ml/environments/single_agent_runtime.py", line 8, in <module>
    from bark.runtime.runtime import Runtime
  File "/home/yuxin/bark/bark/runtime/__init__.py", line 1, in <module>
    from .runtime import Runtime 
  File "/home/yuxin/bark/bark/runtime/runtime.py", line 14, in <module>
    from bark.core.world.opendrive import *
ModuleNotFoundError: No module named 'bark.core'

I checked the forum of 'bark' and notice that there is a similar question on 'bark.core' but no one replied yet. Any help will be appreciated!