matlab doc online says linear classifier is lda by default.
Andrew Winterman <[email protected]> schrieb:
>Logistic regression can be used as a linear classifier. Maybe that's
>matlab's linear classifier?
>
>On Thursday, February 14, 2013, David Reed wrote:
>
>> I was mistaken, R is providing the exact same results as Python. Is
>> there a difference between a linear classifer and LDA? Matlab never
>uses
>> the words Linear Discriminant Analysis, its just says linear
>classifier,
>> but is giving different results than these other two software
>packages.
>>
>>
>> On Thu, Feb 14, 2013 at 1:19 PM, David Reed
><[email protected]<javascript:_e({}, 'cvml',
>'[email protected]');>
>> > wrote:
>>
>>> I don't think I can provide the data, but I'm trying to create some
>>> simulated data that produces a similar difference.
>>>
>>> I was just messing with R, and for LDA got a different result from
>the
>>> other 2. I wonder if its just something I am doing wrong.
>>>
>>>
>>>
>>> On Thu, Feb 14, 2013 at 10:07 AM, Andreas Mueller <
>>> [email protected] <javascript:_e({}, 'cvml',
>>> '[email protected]');>> wrote:
>>>
>>>> On 02/14/2013 04:04 PM, Andreas Mueller wrote:
>>>> > On 02/14/2013 03:59 PM, David Reed wrote:
>>>> >> I dont think this is the problem. My data is definetly
>oversampled, I
>>>> >> have 5000 samples for the 1 feature.
>>>> >>
>>>> >> I also should say that the problem that led be to LDA was seeing
>there
>>>> >> was a large bias between SVM classification accuracy in sklearn
>and
>>>> >> matlab. I am using the same parameters on both, and again
>testing on
>>>> >> my training. Using the same univariate data set, I see 0.63
>from
>>>> >> matlab and 0.58 from sklearn.
>>>> >>
>>>> > Which version of scikit-learn are you using? Are you using sparse
>>>> matrices?
>>>> > There was a weird bug in using sparse matrices and SVMs in an
>earlier
>>>> > version of sklearn.
>>>> > If there is still a discrepancy in either of the algorithms, we
>must
>>>> > investigate!
>>>> >
>>>> Would it be possible to provide your data or even better, some
>small
>>>> dataset
>>>> to reproduce the discrepancy?
>>>>
>>>>
>>>>
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>>>
>>>
>>
>
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>Andrew Winterman
>714 362 6823
>
>
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