2012/9/4 Andreas Mueller <[email protected]>:
> On 09/04/2012 03:43 PM, Olivier Grisel wrote:
>> 2012/9/4 Andreas Mueller <[email protected]>:
>>> Hi everybody.
>>> I'm pretty new to feature selection stuff and I tried to use the chi2
>>> selection.
>>> I got a pvalue of exactly zero on one of the features and one of e-250
>>> on another one.
>>> That seems a bit fishy, in particular as they don't seem to correlate
>>> very strongly.
>>> Maybe I misunderstood something.
>>> Any hints?
>> Can you put a gist with a reproduction script + data subset?
>>
> Here:
> https://gist.github.com/3621861
There are typos in the script:
import numpy as np
from sklearn.feature_selection import chi2
data = np.load("values.npy")
labels = np.load("labels.npy")
print(chi2(data, labels))
Here is the output:
(array([ 2004.40215852, 14210.70616566, 101.8947577 , 54.13746251,
49.02911194, 2029.54198255, 67.61064593,
564.51314541]), array([ 0.00000000e+000, 0.00000000e+000,
5.85512658e-024,
1.86942888e-013, 2.52191591e-012, 0.00000000e+000,
1.99189131e-016, 8.76728404e-125]))
--
Olivier
http://twitter.com/ogrisel - http://github.com/ogrisel
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