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imbalanced data
hi
how can I solve imbalanced problem?
I used adaboostm1 weka, but it doesn't work at all,
1. I used sampling method to balance data and performance developed but as far as I know it should be by far better methods to solve imbalanced problem.
2. Moreover, libsvm can be used in weighted mode, but I do not know how use it and tune libsvm parameters like cost weight ,....
and how it can be used in metacost?
I'd appreciate if you help me
Regards
REZA
0
Answers
just put the LibSVM learner inside the MetaCost learner. The metaCost learner is a so called Meta Learner using another, inner learning scheme.
This time you could have simply read the manual. This is why haddock repeats it so many times. And although this IS a help forum, other people have to spend their time for giving you hints. So I think it's fair that you made your best efforts to cope with the problem yourself. And this always should include the (admittedly spare) documentation.
Greetings,
Sebastian
thanks Sebastian
my code is :
but it halts by "process failed " massage and I donot know why
I'd appreciate if help me about this matter
Regards
REZA
but it doesn't work, it seems you just disabled averagebuilder and performance of it, I do it in my data, but again process failed message . however thanks for your time and consideration
G Nov 28, 2009 5:50:44 PM: [Fatal] Process failed: operator cannot be executed (3). Check the log messages...
Root[1] (Process)
+- CSVExampleSource[1] (CSVExampleSource)
+- ExampleFilter[1] (ExampleFilter)
+- Normalization[1] (Normalization)
+- Random Optimizer[1] (RandomOptimizer)
+- Xvalidation[1] (XValidation)
| +- MetaCost[1] (MetaCost)
| | +- LibSVMLearner[10] (LibSVMLearner)
| +- OperatorChain (2)[1] (OperatorChain)
here ==> | +- ModelApplier (2)[1] (ModelApplier)
| +- Performance (2)[0] (Performance)
+- ProcessLog[0] (ProcessLog)
no, even I changed the code to as you think, but again same problem
but:
number of classes are 7 and by filter I reduced them to 3, but classifier apply to data as if it has 7 group because when I changed size of matrix 7
it works.?
so.... how can ....?
thanks for your time
regards
REZA