sklearn error ValueError: Input contains NaN, infinity or a value too large for dtype(‘float64’)

This might happen inside scikit, and it depends on what you’re doing. I recommend reading the documentation for the functions you’re using. You might be using one which depends e.g. on your matrix being positive definite and not fulfilling that criteria.

EDIT: How could I miss that:

np.isnan(mat.any()) #and gets False
np.isfinite(mat.all()) #and gets True

is obviously wrong. Right would be:

np.any(np.isnan(mat))

and

np.all(np.isfinite(mat))

You want to check wheter any of the element is NaN, and not whether the return value of the any function is a number…

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