Array passed to %s is full of zeros.

Package:

scikit-learn

47032

Exception Class:

ValueError

Raise code

def _check_init(A, shape, whom):
    A = check_array(A)
    if np.shape(A) != shape:
        raise ValueError('Array with wrong shape passed to %s. Expected %s, '
                         'but got %s ' % (whom, shape, np.shape(A)))
    check_non_negative(A, whom)
    if np.max(A) == 0:
        raise ValueError('Array passed to %s is full of zeros.' % whom)


def _beta_divergence(X, W, H, beta, square_root=False):
    """Compute the beta-divergence of X and dot(W, H).

    Parameters
    ---------- """

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Links to the raise (1)

https://github.com/scikit-learn/scikit-learn/blob/c67518350f91072f9d37ed09c5ef7edf555b6cf6/sklearn/decomposition/_nmf.py#L60

Ways to fix

Summary:

This exception is thrown when the _check_init function is called. This function takes in three required parameters: A, shape, and whom. A must be an array that has the same shape as the value passed in for the parameter shape. Then a check is performed to ensure that A has a value larger than 0, if nothing is found then this exception is thrown. So ensure that A has at least one value that is larger than 0.

Code to Reproduce the Error (Wrong):

from sklearn.decomposition._nmf import _check_init
import numpy as np

A = np.zeros((2,2))
shape = (2,2)
_check_init(A, shape, 'whom')

Error Message:

ValueError                                Traceback (most recent call last)
<ipython-input-2-bb9bec6d8eb8> in <module>()
      4 A = np.zeros((2,2))
      5 shape = (2,2)
----> 6 _check_init(A, shape, 'whom')

/usr/local/lib/python3.7/dist-packages/sklearn/decomposition/_nmf.py in _check_init(A, shape, whom)
     57     check_non_negative(A, whom)
     58     if np.max(A) == 0:
---> 59         raise ValueError('Array passed to %s is full of zeros.' % whom)
     60 
     61 

ValueError: Array passed to whom is full of zeros.

Working Version (Right):

from sklearn.decomposition._nmf import _check_init
import numpy as np

A = np.ones((2,2))
shape = (2,2)
_check_init(A, shape, 'whom')

Jul 16, 2021

codingcomedyig 7.9k

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