ImportError: cannot import name check_array from sklearn.utils.validation

Question

When I import the function check_array from module sklearn.utils.validation, it got an Import Error (ImportError: cannot import name check_array). The tab completion got check_arrays, but I'm wondering there only exists a function called check_array in validation.py ( source code on Github). Besides, the spectral clustering algorithm implemented in scikit-learn/sklearn/cluster/spectral.py also used from ..utils.validation import check_array, not check_arrays. I'm quite confused about this, and my scikit-learn version is '0.15.0b1'. Hope somebody gives me a clue.

sample code

import numpy as np
from sklearn.utils.validation import check_array
def my_fit_affinity(X, affinity_type, n_neighbors, **kernel_params):
    """ Create an affinity matrix for X using the selected affinity type
    """    
    X = check_array(X, accept_sparse = ['csr', 'csc', 'coo']) 
    ....
    return affinity_matrix_

This has recently changed. So it is probably a version issue. Make sure you are on the latest one and that there are no residual files of the preceding ones anywhere. — eickenberg, Nov 29 '14 at 13:38
meaning that it works now or does the problem persist / has it changed in nature? — eickenberg, Dec 02 '14 at 10:24
@eickenberg the problem still exists but using `check_arrays` achieved the same purpose — LittleLittleQ, Dec 03 '14 at 06:47
How did you fix the problem? I am getting a vary similar one. — amaatouq, Dec 20 '14 at 20:18
@amaatouq using `check_arrays` instead of `check_array` may work — LittleLittleQ, Dec 22 '14 at 05:54

score 14 · Answer 1 · edited Jan 01 '20 at 14:44

14

If you use jupyter notebook, try restarting your kernel.

edited Jan 01 '20 at 14:44

geisterfurz007

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answered Jan 01 '20 at 14:41

Dean Wang

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score 2 · Answer 2 · answered Jul 09 '15 at 12:23

2

To those searching, as @eickenberg mentioned in the comments, this was something that was changed between versions. Using the latest version of scikit-learn resolved the issue.

answered Jul 09 '15 at 12:23

taleinat

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score 1 · Answer 3 · answered Dec 06 '21 at 02:34

1

Hit kernel > restart and run all

answered Dec 06 '21 at 02:34

Henry Burii

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Restarting the kernel was already mentioned in [this earlier answer](https://stackoverflow.com/a/59553425/2745495). – Gino Mempin Dec 08 '21 at 03:53

ImportError: cannot import name check_array from sklearn.utils.validation

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