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So the proper way to do it is to create a Folder in your flow, and then upload your pickle file inside it. You can then, with the dataiku api, access the content of such folder and do joblib.load()
You can find in this link an example of such workflow: http://gallery.dataiku.com/projects/DKU_ADVANCEDML/flow/
Concretely, what you should look closely is this python recipe that does exactly what you are looking for: http://gallery.dataiku.com/projects/DKU_ADVANCEDML/recipes/compute_test_scored_scikit/