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Running inside Google Colab #373

philwinder opened this issue Jun 27, 2019 · 1 comment


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commented Jun 27, 2019

I'm attempting to get SLM-Lab working inside a Google Colab instance. I can't get the getting started example working because of a torch error.

To Reproduce
Run this notebook

Error logs

Traceback (most recent call last):
  File "", line 77, in <module>
    mp.set_start_method('spawn')  # for distributed pytorch to work
  File "/usr/lib/python3.6/multiprocessing/", line 242, in set_start_method
    raise RuntimeError('context has already been set')
RuntimeError: context has already been set

I think the solution is to add some exception handling around the mp.set_start_method('spawn') call, but I'm not certain about that.



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commented Jun 29, 2019

We've never ran it on colab notebook, thanks for trying this out! Seem like the runtime is different than when running from a plain bash shell. I'll push a patch for this

btw, a way to use the optimized conda environment inside colab is to install following the SLM Lab README and run the conda and python command in one line:
!conda activate lab && python slm_lab/spec/demo.json dqn_cartpole dev

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