Tensorboard: no such file

I want to try Tensorboard. I found a pytorch example on github and it could run on OpenPAI v1.0.0. I then added '--log_dir = path:/mnt/tensorboard' in the command line and enabled Tensorboard. But it cannot run and the error message is 'no such file. Also, the Exit Diagnostics outputs 'No module named ''tensorflow':

How to reproduce it:

OpenPAI Environment:

• OpenPAI version: v1.0.0
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):pytorch 1.2.0 + python 3.6 with GPU, CUDA 10.0
• Hardware (e.g. core number, memory size, storage size, GPU type etc.):
• Others:

Anything else we need to know:
The repo I'm using is https://github.com/akamaster/pytorch_resnet_cifar10 (thanks akamaster)