Update simple_dqn.py - rlax.examples import

[den-run-ai]

import rlax.examples does not work:

Traceback (most recent call last):
  File "examples/simple_dqn.py", line 28, in <module>
    from rlax.examples import experiment
ModuleNotFoundError: No module named 'rlax.examples'

[Daedalus359]

Thank you! This was confusing me. Hopefully the change will be merged at some point.

[katebaumli]

Thanks!