[FIXED] Execute a Jupyter notebook with papermill and output a unique filename

Issue

I'd like to use papermill as part of a data science workflow to record experiments. The key idea is that the output notebook should be stored as a unique artifact -- an immutable record of the experiment. As such, I want the output filename to be a unique filename, such as experiment_<hash>.ipynb. How can I do this automatically at the linux CLI? From the papermill docs, it looks like I must specify the exact output filename like

papermill local/input.ipynb s3://bkt/output.ipynb -f parameters.yaml

whereas what I really want is something like

papermill local/input.ipynb s3://bkt/output_[UNIQUE HASH HERE].ipynb -f parameters.yaml

I want to do this within the papermill call automatically. A manual way would be

$ echo cat input.ipynb | md5sum
22f69c25ee3a855b17fead21e702668a
$ papermill local/input.ipynb s3://bkt/output_22f69c25ee3a855b17fead21e702668a.ipynb -f parameters.yaml

but I don't want to do it manually with cut and paste.

Solution

You can use command substitution, for example like this:

papermill local/input.ipynb s3://bkt/output_`date +%s | sha256sum | base64 | head -c 32`.ipynb -f parameters.yaml

or newer way

papermill local/input.ipynb s3://bkt/output_$(date +%s | sha256sum | base64 | head -c 32).ipynb -f parameters.yaml

Answered By - Tomáš Linhart