build_model_from_config('config.json') failed

Created by: ismaslov

Hello all,

I'm trying to execute the following code:

   from deeppavlov.core.commands.infer import build_model_from_config
   vocab = build_model_from_config('config/dstc2_vocab_config.json')

and catches the error:

 File "~/pytest/lib/python3.6/site-packages/deeppavlov/core/commands/infer.py", line 29, in build_model_from_config
    set_deeppavlov_root(config)
  File "~/pytest/lib/python3.6/site-packages/deeppavlov/core/commands/utils.py", line 29, in set_deeppavlov_root
    deeppavlov_root = Path(config['deeppavlov_root'])
TypeError: string indices must be integers

I think this function should read and parse json-file with config like train_evaluate_model_from_config for example.