clarified eigen line in demo
clarified eigen line in demo

wgmueller1/pyhsmm,bikash/pyhsmm,fivejjs/pyhsmm,theDataGeek/pyhsmm,fivejjs/pyhsmm,wgmueller1/pyhsmm,fivejjs/pyhsmm,wgmueller1/pyhsmm,bikash/pyhsmm,fivejjs/pyhsmm,mattjj/pyhsmm,theDataGeek/pyhsmm,bikash/pyhsmm,theDataGeek/pyhsmm,theDataGeek/pyhsmm,fivejjs/pyhsmm,theDataGeek/pyhsmm,wgmueller1/pyhsmm,wgmueller1/pyhsmm,mattjj/pyhsmm