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

I am using sklearn and having a problem with the affinity propagation. I have built an input matrix and I keep getting the following error.

ValueError: Input contains NaN, infinity or a value too large for dtype('float64').

I have run

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

I tried using

mat[np.isfinite(mat) == True] = 0

to remove the infinite values but this did not work either.
What can I do to get rid of the infinite values in my matrix, so that I can use the affinity propagation algorithm?

I am using anaconda and python 2.7.9.

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