working implementation of SGD
fixed merge
fixed SGD to work with new interface
Merge branch 'master' into SGD
Merge branch 'master' into SGD
fixed index
Merge branch 'bgplvm' into SGD
minor changes
merged master
Merge branch 'master' into SGD
made SGD work with new get/set param
Merge branch 'master' into SGD
minor changes
fixed bug in SGD
made it clear that we are working with -f(x)
sometimes a step with missing data can be a bit unstable
pretty much the version running on ec2
added support for sparse matrices
psi statistics for the linear kernel
precomputations for linear psi statistics