Parameter n_best must be greater than 0, but its value is (param1)

Package:

scikit-learn

47032

Exception Class:

ValueError

Raise code

                     " {}. It should either be a single integer"
                                 " or an iterable with two integers:"
                                 " (n_row_clusters, n_column_clusters)") from e
        if self.n_components < 1:
            raise ValueError("Parameter n_components must be greater than 0,"
                             " but its value is {}".format(self.n_components))
        if self.n_best < 1:
            raise ValueError("Parameter n_best must be greater than 0,"
                             " but its value is {}".format(self.n_best))
        if self.n_best > self.n_components:
            raise ValueError("n_best cannot be larger than"
                             " n_components, but {} >  {}"
                             "".format(self.n_best, self.n_components))

    def _fit(self, X):
        n_sv

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Links to the raise (1)

https://github.com/scikit-learn/scikit-learn/blob/c67518350f91072f9d37ed09c5ef7edf555b6cf6/sklearn/cluster/_bicluster.py#L454

Ways to fix

The parameter n_best should be given a value greater than 0.

Code to reproduce the exception:

from sklearn.cluster import SpectralBiclustering
import numpy as np
X = np.array([[1, 1], [2, 1], [1, 0],
              [4, 7], [3, 5], [3, 6]])
clustering = SpectralBiclustering(n_clusters=2, random_state=0,n_best=0).fit(X)
clustering.row_labels_

The exception output:

--------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-5-f7d719aed33c> in <module>()  3 X = np.array([[1, 1], [2, 1], [1, 0],  4 [4, 7], [3, 5], [3, 6]]) ----> 5 clustering = SpectralBiclustering(n_clusters=2, random_state=0,n_best=0).fit(X)  6 clustering.row_labels_ 
/usr/local/lib/python3.7/dist-packages/sklearn/cluster/_bicluster.py in _check_parameters(self)  524 raise ValueError(  525 "Parameter n_best must be greater than 0, but its value is {}".format( --> 526 self.n_best  527 )  528 ) 
ValueError: Parameter n_best must be greater than 0, but its value is 0

Fixed version of the code:

from sklearn.cluster import SpectralBiclustering
import numpy as np
X = np.array([[1, 1], [2, 1], [1, 0],
              [4, 7], [3, 5], [3, 6]])
clustering = SpectralBiclustering(n_clusters=2, random_state=0,n_best=2).fit(X)
clustering.row_labels_

Output:

array([1, 1, 1, 0, 0, 0], dtype=int32)

Mar 29, 2022

kellemnegasi 30.0k

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