ValueError: Integers to negative integer powers are not allowed.

[Devin Shanahan]

I am encountering a ValueError: Integers to negative integer powers are not allowed. I am experiencing this error in both mlpy/da.py and mlpy/parzen.py.  This seems to be due to the array for y being cast as dtype=np.int.  This results in numpy raising an error in the following lines:

da.py

line 208, in learn

    mk = np.sqrt(nk**-1 - n**-1)

parzen.py

line 86, in learn

    alphaplus = np.where(ynew==1, nplus**-1, 0)

The values for nk, n, nplus are all derived from y and therefore have the np.int dtype as well.

Is anyone else having this same issue? Is there a way that I can resolve this?

Thanks,

Devin

[nody yu]

Devin Shanahan於 2018年3月20日星期二 UTC+8下午9時26分26秒寫道：

In  line 86, in learn

    

     alphaplus = np.where(ynew==1, nplus**-1, 0)

you can change it to :

     alphaplus = np.where(ynew==1, 1/nplus, 0)

mine: python3.5 numpy 0.18