class = None, token_indexers: Dict[str,] = None, max_sequence_length: int = None, start_tokens: List[str] = None, end_tokens: List[str] = None)[source]


Reads sentences, one per line, for language modeling. This does not handle arbitrarily formatted text with sentences spanning multiple lines.

tokenizerTokenizer, optional

Tokenizer to use to split the input sentences into words or other kinds of tokens. Defaults to WordTokenizer().

token_indexersDict[str, TokenIndexer], optional

Indexers used to define input token representations. Defaults to {"tokens": SingleIdTokenIndexer()}.

max_sequence_length: ``int``, optional

If specified, sentences with more than this number of tokens will be dropped.

start_tokensList[str], optional (default=``None``)

These are prepended to the tokens provided to the TextField.

end_tokensList[str], optional (default=``None``)

These are appended to the tokens provided to the TextField.

text_to_instance(self, sentence: str) →[source]

Does whatever tokenization or processing is necessary to go from textual input to an Instance. The primary intended use for this is with a Predictor, which gets text input as a JSON object and needs to process it to be input to a model.

The intent here is to share code between _read() and what happens at model serving time, or any other time you want to make a prediction from new data. We need to process the data in the same way it was done at training time. Allowing the DatasetReader to process new text lets us accomplish this, as we can just call DatasetReader.text_to_instance when serving predictions.

The input type here is rather vaguely specified, unfortunately. The Predictor will have to make some assumptions about the kind of DatasetReader that it’s using, in order to pass it the right information.