[BUG]: ConfigAttributeError when running `python -m pax.experiment`

[cool-RR]

Description

I never used Pax before. The readme said to run python -m pax.experiment, so I did. I got this error:

(jax_env) ➜  pax git:(main) python -m pax.experiment
/home/ramrachum/.venvs/jax_env/lib/python3.11/site-packages/hydra/_internal/hydra.py:119: UserWarning: Future Hydra versions will no longer change working directory at job runtime by default.
See https://hydra.cc/docs/1.2/upgrades/1.1_to_1.2/changes_to_job_working_dir/ for more information.
  ret = run_job(
Jax backend: cpu
[2023-11-09 18:18:58,117][root][INFO] - => Global setup ...
[2023-11-09 18:18:58,119][root][INFO] - => Done in 1.187 ms
[2023-11-09 18:18:58,119][root][INFO] -
Error executing job with overrides: []
Traceback (most recent call last):
  File "/herring/pax/pax/experiment.py", line 861, in main
    save_dir = global_setup(args)
               ^^^^^^^^^^^^^^^^^^
  File "/herring/pax/pax/experiment.py", line 110, in global_setup
    if not args.runner == "eval":
           ^^^^^^^^^^^
omegaconf.errors.ConfigAttributeError: Key 'runner' is not in struct
    full_key: runner
    object_type=dict

Set the environment variable HYDRA_FULL_ERROR=1 for a complete stack trace.

What pax version are you using?

430b254d8bc05d33a46412c2e475d84f62518cc0

What jax/jaxlib version are you using?

0.4.20

Which accelerator(s) are you using?

CPU

Additional system info

Python 3.11, Ubuntu 22.04.3 LTS

NVIDIA GPU info

No response