[algorithm] fixed LDA unit test

4 jobs for add-new-classifiers in 29 minutes and 59 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #142808
docker
build_linux_27

00:24:12

passed #142809
docker
build_linux_36

00:19:35

passed #142810
macosx
build_macosx_27

00:09:57

passed #142811
macosx
build_macosx_36

00:10:56