class Dict[str,] = None, domain_identifier: str = None, coding_scheme: str = 'BIO', lazy: bool = False)[source]


This DatasetReader is designed to read in the English OntoNotes v5.0 data for fine-grained named entity recognition. It returns a dataset of instances with the following fields:


The tokens in the sentence.


A sequence of BIO tags for the NER classes.

Note that the “/pt/” directory of the Onotonotes dataset representing annotations on the new and old testaments of the Bible are excluded, because they do not contain NER annotations.

token_indexersDict[str, TokenIndexer], optional

We similarly use this for both the premise and the hypothesis. See TokenIndexer. Default is {"tokens": SingleIdTokenIndexer()}.

domain_identifier: ``str``, (default = None)

A string denoting a sub-domain of the Ontonotes 5.0 dataset to use. If present, only conll files under paths containing this domain identifier will be processed.

coding_schemestr, (default = None).

The coding scheme to use for the NER labels. Valid options are “BIO” or “BIOUL”.

A Dataset of Instances for Fine-Grained NER.
text_to_instance(self, tokens:List[], ner_tags:List[str]=None) →[source]

We take pre-tokenized input here, because we don’t have a tokenizer in this class.