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43 lines
2.7 KiB
Markdown
43 lines
2.7 KiB
Markdown
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When you call `nlp` on a text, spaCy first tokenizes the text to produce a `Doc`
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object. The `Doc` is then processed in several different steps – this is also
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referred to as the **processing pipeline**. The pipeline used by the
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[default models](/models) consists of a tagger, a parser and an entity
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recognizer. Each pipeline component returns the processed `Doc`, which is then
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passed on to the next component.
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> - **Name**: ID of the pipeline component.
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> - **Component:** spaCy's implementation of the component.
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> - **Creates:** Objects, attributes and properties modified and set by the
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> component.
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| Name | Component | Creates | Description |
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| ------------- | ------------------------------------------------------------------ | ----------------------------------------------------------- | ------------------------------------------------ |
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| **tokenizer** | [`Tokenizer`](/api/tokenizer) | `Doc` | Segment text into tokens. |
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| **tagger** | [`Tagger`](/api/tagger) | `Doc[i].tag` | Assign part-of-speech tags. |
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| **parser** | [`DependencyParser`](/api/dependencyparser) | `Doc[i].head`, `Doc[i].dep`, `Doc.sents`, `Doc.noun_chunks` | Assign dependency labels. |
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| **ner** | [`EntityRecognizer`](/api/entityrecognizer) | `Doc.ents`, `Doc[i].ent_iob`, `Doc[i].ent_type` | Detect and label named entities. |
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| **textcat** | [`TextCategorizer`](/api/textcategorizer) | `Doc.cats` | Assign document labels. |
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| ... | [custom components](/usage/processing-pipelines#custom-components) | `Doc._.xxx`, `Token._.xxx`, `Span._.xxx` | Assign custom attributes, methods or properties. |
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The processing pipeline always **depends on the statistical model** and its
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capabilities. For example, a pipeline can only include an entity recognizer
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component if the model includes data to make predictions of entity labels. This
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is why each model will specify the pipeline to use in its meta data, as a simple
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list containing the component names:
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```json
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"pipeline": ["tagger", "parser", "ner"]
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```
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import Accordion from 'components/accordion.js'
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<Accordion title="Does the order of pipeline components matter?">
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No
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</Accordion>
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---
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