Hi,

I used mahout kmeans and then clusterdump. The biggest cluster (number
of members is 844992), here is the result:

VL-1705919{n=844992 c=[] r=[]}
        Top Terms:
        Weight : [props - optional]:  Point:
        1.0 : [distance=0.0]: []
        1.0 : [distance=0.0]: []
        1.0 : [distance=0.0]: []
        1.0 : [distance=0.0]: []
        1.0 : [distance=0.0]: []
        1.0 : [distance=0.0]: []

What does this mean? This whole cluster is made of empty vectors(members)?

Best,
Baoqiang

Did you run kmeans with -cl<run input vector clustering>  option set to "true"?
On 19-03-2012 07:38, Baoqiang Cao wrote:
> Hi,
>
> I used mahout kmeans and then clusterdump. The biggest cluster (number
> of members is 844992), here is the result:
>
> VL-1705919{n=844992 c=[] r=[]}
>          Top Terms:
>          Weight : [props - optional]:  Point:
>          1.0 : [distance=0.0]: []
>          1.0 : [distance=0.0]: []
>          1.0 : [distance=0.0]: []
>          1.0 : [distance=0.0]: []
>          1.0 : [distance=0.0]: []
>          1.0 : [distance=0.0]: []
>
> What does this mean? This whole cluster is made of empty vectors(members)?
>
> Best,
> Baoqiang

Yes, I used -cl in kmeans step. It is that the biggest cluster is empty, all others are not empty. I don't know why.

Sent from my iPhone

On Mar 20, 2012, at 1:36 AM, Paritosh Ranjan <[EMAIL PROTECTED]> wrote:

> Did you run kmeans with -cl<run input vector clustering>  option set to "true"?
>
>
> On 19-03-2012 07:38, Baoqiang Cao wrote:
>> Hi,
>>
>> I used mahout kmeans and then clusterdump. The biggest cluster (number
>> of members is 844992), here is the result:
>>
>> VL-1705919{n=844992 c=[] r=[]}
>>         Top Terms:
>>         Weight : [props - optional]:  Point:
>>         1.0 : [distance=0.0]: []
>>         1.0 : [distance=0.0]: []
>>         1.0 : [distance=0.0]: []
>>         1.0 : [distance=0.0]: []
>>         1.0 : [distance=0.0]: []
>>         1.0 : [distance=0.0]: []
>>
>> What does this mean? This whole cluster is made of empty vectors(members)?
>>
>> Best,
>> Baoqiang
>

Can you try cluster output post processor once?

You will find the documentation of how to use it here
https://cwiki.apache.org/MAHOUT/top-down-clustering.html

If you get empty vectors with clusterpp also, then the problem is in the
clustering step somewhere, else there is some problem in cluster dumper.
It will at least help figure out the problem area.

On 20-03-2012 17:40, Baoqiang wrote:
> Yes, I used -cl in kmeans step. It is that the biggest cluster is empty, all others are not empty. I don't know why.
>
> Sent from my iPhone
>
> On Mar 20, 2012, at 1:36 AM, Paritosh Ranjan<[EMAIL PROTECTED]>  wrote:
>
>> Did you run kmeans with -cl<run input vector clustering>   option set to "true"?
>>
>>
>> On 19-03-2012 07:38, Baoqiang Cao wrote:
>>> Hi,
>>>
>>> I used mahout kmeans and then clusterdump. The biggest cluster (number
>>> of members is 844992), here is the result:
>>>
>>> VL-1705919{n=844992 c=[] r=[]}
>>>          Top Terms:
>>>          Weight : [props - optional]:  Point:
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>
>>> What does this mean? This whole cluster is made of empty vectors(members)?
>>>
>>> Best,
>>> Baoqiang

Empty? Note that the printouts of Mahout vectors prints only the
non-zero elements. It looks like you may have had many such zero vectors
and they were clustered into VL-1705919 which has zero for center and
radius. If your other clusters look differently, then I think this is
probably correct.
On 3/20/12 6:10 AM, Baoqiang wrote:
> Yes, I used -cl in kmeans step. It is that the biggest cluster is empty, all others are not empty. I don't know why.
>
> Sent from my iPhone
>
> On Mar 20, 2012, at 1:36 AM, Paritosh Ranjan<[EMAIL PROTECTED]>  wrote:
>
>> Did you run kmeans with -cl<run input vector clustering>   option set to "true"?
>>
>>
>> On 19-03-2012 07:38, Baoqiang Cao wrote:
>>> Hi,
>>>
>>> I used mahout kmeans and then clusterdump. The biggest cluster (number
>>> of members is 844992), here is the result:
>>>
>>> VL-1705919{n=844992 c=[] r=[]}
>>>          Top Terms:
>>>          Weight : [props - optional]:  Point:
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>          1.0 : [distance=0.0]: []
>>>
>>> What does this mean? This whole cluster is made of empty vectors(members)?
>>>
>>> Best,
>>> Baoqiang
>