Passing a list of input files through papermill

Renku (CLI)
1

Hello group!

In my Jupyter notebook, I specify a list of input files to be processed like this:
files = [‘msCam1.avi’, ‘msCam2.avi’]
data_folder = ‘/work/imaging-analysis/data/raw_movies’

When running the notebook from the command line through papermill, the list can also be specified and everything runs fine:

papermill --kernel Python3 \
notebooks/01_cnmfE_MotionCorrect.ipynb \
notebooks/01_cnmfE_MotionCorrect.ran.ipynb \
-p data_folder /work/imaging-analysis/data/raw_movies \
-y '{files:[msCam1.avi, msCam2.avi]}'

But if I try to run the exact same command through renku run I get an error(after the notebook has completed):

Input Notebook:  notebooks/01_cnmfE_MotionCorrect.ipynb
Output Notebook: notebooks/01_cnmfE_MotionCorrect.ran.ipynb
Executing: 100%|██████████████████████████████████████████████████████████████████████████████████████| 17/17 [01:01<00:00,  3.64s/cell]
Error: The output directory "data/raw_movies" is not empty.

Delete existing files before running the command:
  (use "git rm <file>..." to remove them first)

        data/raw_movies/msCam1.avi
        data/raw_movies/msCam2.avi

Once you have removed files that should be used as outputs,
you can safely rerun the previous command.

Why does it complain about the input files in this case?

2

Hi Henry,

I’m trying to understand this case. Are you writing a file to the data/raw_movies folder in your notebook?

3

Hi Sekhar,

thanks for looking into this.

Yes, the notebook is writing an output file to this folder. If it helps, the notebook is located here:
https://limited.renku.ch/gitlab/hluetcke/caiman-calcium-imaging-analysis/-/blob/master/notebooks/01_cnmfE_MotionCorrect.ipynb

The saving happens in the motion correction cell (3rd last) with the cm.save_memmap function.

Best, Henry

4

I can recreate this problem. I would have thought that explicitly specifying the inputs/inputs by using one of the mechanisms detailed here https://renku-python.readthedocs.io/en/latest/commands.html#module-renku.cli.run would have fixed it, but they do not.

There are two workarounds you can do:

  • write the output to a different directory than where you read the input
  • omit the data_folder parameter and explicitly specify the input files, e.g., -y '{files: ["data/raw_movies/msCam1.avi", ""data/raw_movies/msCam2.avi"]}'

I am checking with the renku-python developers to see if there is another solution and will file a bug to the issue tracker if necessary.

5

I have filed a bug report: https://github.com/SwissDataScienceCenter/renku-python/issues/1321

Future developments regarding this question will be visible there.

6

Thank you. I will check out the workarounds in the meantime.

7

BTW, this project contains details about the problem and examples of implementing the workarounds.

https://dev.renku.ch/projects/cramakri/output-detection-test