os.chdir("/deepmatching") OSError: [Errno 2] No such file or directory: '/deepmatching'

#os.chdir("/deepmatching")
os.chdir(os.path.dirname(os.path.abspath("deepmatching1")))

(AlphaPose20180911) luo@luo-ThinkPad-W540:PoseFlow$
(AlphaPose20180911) luo@luo-ThinkPad-W540:PoseFlow$
(AlphaPose20180911) luo@luo-ThinkPad-W540:PoseFlow$ python deepmatching.py
Traceback (most recent call last):
File "deepmatching.py", line 17, in <module>
os.chdir("/deepmatching")
OSError: [Errno 2] No such file or directory: '/deepmatching'
(AlphaPose20180911) luo@luo-ThinkPad-W540:PoseFlow$
(AlphaPose20180911) luo@luo-ThinkPad-W540:PoseFlow$