fix build_trainer param

jmwang66

2023-02-09 3d54e6134c3884ada8a22fe8d1b15dc58edbd26f

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.