Doesn't create tensorboard logdir

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Expected behavior

It would be great to view loss on tensorboard, but faceswap didn't create logdir for me.

Actual behavior

No logdir.

Steps to reproduce

python3 faceswap.py train ...

Other relevant information

Command lined used (if not specified in steps to reproduce): faceswap.py ...
Operating system and version: Windows, macOS, Linux
Python version: 2.7, 3.5, 3.6.4, ...
Faceswap version: commit hash or version number
Faceswap method: CPU/GPU
Other related issues: #123, #124...
... (for example, installed packages that you can see with pip freeze)

deepfakes / faceswap-playground