Revert "rm ssd output"
Revert "rm ssd output"

This reverts commit 1d5581518880403d4d2975903f1955b3582c9593.

mli/gluon-tutorials-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh