8000 Can't reload old model with joblib · Issue #14724 · scikit-learn/scikit-learn · GitHub
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weber8thomas opened this issue Aug 22, 2019 · 1 comment
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Can't reload old model with joblib #14724

weber8thomas opened this issue Aug 22, 2019 · 1 comment

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@weber8thomas
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weber8thomas commented Aug 22, 2019 •
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Hello everyone,

I have a problem with the update that consists to call directly joblib instead of calling it from sklearn.externals.

Here's my issue :

I stored a model with scikit version 0.20.3 by using scikit.externals joblib dump function. I updated my packages and it's now not possible to retrieve my model.

Traceback (most recent call last):
  File "/gstock/biolo_datasets/variation/benchmark/RADMEL/FINAL_DATA/VarClass_RADMEL/VarClass.py", line 617, in <module>
    testing(arg_dict)
  File "/gstock/biolo_datasets/variation/benchmark/RADMEL/FINAL_DATA/VarClass_RADMEL/VarClass.py", line 115, in testing
    threshold=ARGS['threshold']
  File "/enadisk/gstock/biolo_datasets/variation/benchmark/RADMEL/FINAL_DATA/VarClass_RADMEL/VarClass_scripts/testing.py", line 57, in __init__
    classifiers = self.load_classifiers(model_dir=model)
  File "/enadisk/gstock/biolo_datasets/variation/benchmark/RADMEL/FINAL_DATA/VarClass_RADMEL/VarClass_scripts/testing.py", line 82, in load_classifiers
    sk_model = joblib.load(mod)
  File "/home/weber/anaconda3/lib/python3.7/site-packages/joblib/numpy_pickle.py", line 598, in load
    obj = _unpickle(fobj, filename, mmap_mode)
  File "/home/weber/anaconda3/lib/python3.7/site-packages/joblib/numpy_pickle.py", line 526, in _unpickle
    obj = unpickler.load()
  File "/home/weber/anaconda3/lib/python3.7/pickle.py", line 1088, in load
    dispatch[key[0]](self)
  File "/home/weber/anaconda3/lib/python3.7/pickle.py", line 1376, in load_global
    klass = self.find_class(module, name)
  File "/home/weber/anaconda3/lib/python3.7/pickle.py", line 1426, in find_class
    __import__(module, level=0)
ModuleNotFoundError: No module named 'sklearn.ensemble.voting_classifier'

I think the problem comes from a mispelling link to the last line above. In documentation, the class is called by the following :
from sklearn.ensemble import VotingClassifier

Thanks in advance for your help !

Best regards,

Thomas
@amueller
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We don't support loading across versions:
https://scikit-learn.org/dev/modules/model_persistence.html

The module was moved here #12513

@vrdn-23 vrdn-23 mentioned this issue Jul 9, 2020
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@jnothman @amueller @weber8thomas
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