Progressbar on list of delayed objects

I have a list of delayed objects in “scores”. Following the documentation, I should be able to do

from dask import compute, persist
from dask.distributed import progress
...
x = persist(scores)  # start computation in the background
progress(x)  # watch progress
scores = compute(x[0])[0]

The problem is that the progress bar in the terminal shows a 100% bar immediately. I can observe with the dashboard that the computation is still going for about 10 minutes.

Am I doing something wrong here? The docs are not explicit for the list of delayed objects.

[mrocklin]

@alvarouc thank you for the reproducible example by the way! It was very helpful to quickly identify the problem.

[martindurant]

The error appears to be in dask.persist; if you call persist(scores), this does not call client.persist at all, but persist(*scores) does. client.persist works with either scores or *scores.