This topic was discussed few weeks ago in this thread Strange fine-tuned NER model behavior. Basically, just remove fit_on line in the vocabulary part of the config and replace the path to data with your path. Training and data format are described in the docs
http://docs.deeppavlov.ai/en/master/features/models/ner.html#train-and-use-the-model
http://docs.deeppavlov.ai/en/master/features/models/ner.html#training-data
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