"Starting omap" but nothing is running 

Hi, 


followed by steps in https://github.com/HIPS/hypergrad/blob/master/readme.md, i get the experiment to run, get log:

```
========== Starting omap ==========
Submitting 20 tasks (output in /tmp/jobdir_744870565721)
```

but there is nothing running.

so, how can i get the experiment running.