In the meantime, can you file a JIRA with your sample code?
On Thu, Jan 10, 2013 at 5:57 PM, Ted Dunning <[email protected]> wrote:
> Hmm...
>
> The LSMRTest code works. So it seems like there is a mismatch somewhere.
>
> In debugging that test, it seems that the loop exits via ITERATION_LIMIT
> which avoids the problematic if statement. This is likely due to the fact
> that the test is solving a Hilbert matrix which has exceedingly bad
> condition number.
>
> I will put in a random matrix test and see what happens. I suspect that
> changing line 457 to this:
>
> if (stop != StopCode.CONTINUE && stop.ordinal() != istop) {
>
> will solve your problem.
>
> This code is translated from the reference implementation for LSMR. That
> is the source of some of these strange constructs.
>
> On Thu, Jan 10, 2013 at 5:04 PM, James Frohnhofer <[email protected]>wrote:
>
>> Hi --
>>
>> I'm fairly new to Mahout, and the LSRM solver seemed like a quick and
>> robust way to solve a linear regression problem.
>>
>> However whenever I call solve, I get an IllegalStateException, at
>> LMSR.java
>> line 457, with the error "bad code math 2 vs 2" or "bad code match 1 vs
>> 1".
>> Looking at the code, it doesn't appear to me that the StopCode could ever
>> be set without throwing this exception.
>>
>> I may be missing something because it's not clear to me at all, the point
>> of setting the StopCode, manually setting the istop flag to a the ordinal
>> value of the StopCode enum and then throwing an exception if they are the
>> same.
>>
>> Also the documentation talks about the regularization parameter lanbda,
>> but
>> the setLambda method is private.
>>
>> Any help or guidance would be appreciated.
>>
>> Thanks,
>>
>> Jim
>>
>
>
