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79 lines
3.2 KiB
Markdown
79 lines
3.2 KiB
Markdown
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---
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title: SentenceSegmenter
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tag: class
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source: spacy/pipeline.pyx
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---
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A simple spaCy hook, to allow custom sentence boundary detection logic that
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doesn't require the dependency parse. By default, sentence segmentation is
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performed by the [`DependencyParser`](/api/dependencyparser), so the
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`SentenceSegmenter` lets you implement a simpler, rule-based strategy that
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doesn't require a statistical model to be loaded. The component is also
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available via the string name `"sentencizer"`. After initialization, it is
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typically added to the processing pipeline using
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[`nlp.add_pipe`](/api/language#add_pipe).
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## SentenceSegmenter.\_\_init\_\_ {#init tag="method"}
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Initialize the sentence segmenter. To change the sentence boundary detection
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strategy, pass a generator function `strategy` on initialization, or assign a
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new strategy to the `.strategy` attribute. Sentence detection strategies should
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be generators that take `Doc` objects and yield `Span` objects for each
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sentence.
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> #### Example
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>
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> ```python
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> # Construction via create_pipe
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> sentencizer = nlp.create_pipe("sentencizer")
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>
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> # Construction from class
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> from spacy.pipeline import SentenceSegmenter
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> sentencizer = SentenceSegmenter(nlp.vocab)
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> ```
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| Name | Type | Description |
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| ----------- | ------------------- | ----------------------------------------------------------- |
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| `vocab` | `Vocab` | The shared vocabulary. |
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| `strategy` | unicode / callable | The segmentation strategy to use. Defaults to `"on_punct"`. |
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| **RETURNS** | `SentenceSegmenter` | The newly constructed object. |
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## SentenceSegmenter.\_\_call\_\_ {#call tag="method"}
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Apply the sentence segmenter on a `Doc`. Typically, this happens automatically
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after the component has been added to the pipeline using
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[`nlp.add_pipe`](/api/language#add_pipe).
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> #### Example
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>
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> ```python
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> from spacy.lang.en import English
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>
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> nlp = English()
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> sentencizer = nlp.create_pipe("sentencizer")
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> nlp.add_pipe(sentencizer)
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> doc = nlp(u"This is a sentence. This is another sentence.")
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> assert list(doc.sents) == 2
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> ```
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| Name | Type | Description |
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| ----------- | ----- | ------------------------------------------------------------ |
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| `doc` | `Doc` | The `Doc` object to process, e.g. the `Doc` in the pipeline. |
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| **RETURNS** | `Doc` | The modified `Doc` with added sentence boundaries. |
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## SentenceSegmenter.split_on_punct {#split_on_punct tag="staticmethod"}
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Split the `Doc` on punctuation characters `.`, `!` and `?`. This is the default
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strategy used by the `SentenceSegmenter.`
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| Name | Type | Description |
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| ---------- | ------ | ------------------------------ |
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| `doc` | `Doc` | The `Doc` object to process. |
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| **YIELDS** | `Span` | The sentences in the document. |
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## Attributes {#attributes}
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| Name | Type | Description |
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| ---------- | -------- | ------------------------------------------------------------------- |
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| `strategy` | callable | The segmentation strategy. Can be overwritten after initialization. |
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