using 'eval' insted of 'distance' in trainer.py

[ElafIslam123]

Hi
Thank you for allosaurus :)
I'm trying to train a model and I've got this error message
AttributeError: module 'editdistance' has no attribute 'distance'
so I replaced 'distance' with 'eval' in trainer.py and it works well
I'm using python v3.7

[xinjli]

Hi, thanks for asking
Can you try upgrading your editdistance module? maybe its a version mismatch

Actually It looks there is a distance function in editdistance here.
https://github.com/roy-ht/editdistance/blob/master/editdistance/__init__.py