mmdetection 默认是不开启tensorboard的，如果你想要打开，首先找到
mmdetection/configs/_base_/default_runtime.py
打开后

log_config = dict(
    interval=50,
    hooks=[
        #dict(type='TextLoggerHook'),
        dict(type='TensorboardLoggerHook')
    ])

将dict(type='TextLoggerHook')注释掉，去掉dict(type='TensorboardLoggerHook')的注释即可