spaCy/website/docs/usage/101/_pipelines.md
Ines Montani e597110d31
💫 Update website (#3285)
<!--- Provide a general summary of your changes in the title. -->

## Description

The new website is implemented using [Gatsby](https://www.gatsbyjs.org) with [Remark](https://github.com/remarkjs/remark) and [MDX](https://mdxjs.com/). This allows authoring content in **straightforward Markdown** without the usual limitations. Standard elements can be overwritten with powerful [React](http://reactjs.org/) components and wherever Markdown syntax isn't enough, JSX components can be used. Hopefully, this update will also make it much easier to contribute to the docs. Once this PR is merged, I'll implement auto-deployment via [Netlify](https://netlify.com) on a specific branch (to avoid building the website on every PR). There's a bunch of other cool stuff that the new setup will allow us to do – including writing front-end tests, service workers, offline support, implementing a search and so on.

This PR also includes various new docs pages and content.
Resolves #3270. Resolves #3222. Resolves #2947. Resolves #2837.


### Types of change
enhancement

## Checklist
<!--- Before you submit the PR, go over this checklist and make sure you can
tick off all the boxes. [] -> [x] -->
- [x] I have submitted the spaCy Contributor Agreement.
- [x] I ran the tests, and all new and existing tests passed.
- [x] My changes don't require a change to the documentation, or if they do, I've added all required information.
2019-02-17 19:31:19 +01:00

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When you call nlp on a text, spaCy first tokenizes the text to produce a Doc object. The Doc is then processed in several different steps this is also referred to as the processing pipeline. The pipeline used by the default models consists of a tagger, a parser and an entity recognizer. Each pipeline component returns the processed Doc, which is then passed on to the next component.

The processing pipeline

  • Name: ID of the pipeline component.
  • Component: spaCy's implementation of the component.
  • Creates: Objects, attributes and properties modified and set by the component.
Name Component Creates Description
tokenizer Tokenizer Doc Segment text into tokens.
tagger Tagger Doc[i].tag Assign part-of-speech tags.
parser DependencyParser Doc[i].head, Doc[i].dep, Doc.sents, Doc.noun_chunks Assign dependency labels.
ner EntityRecognizer Doc.ents, Doc[i].ent_iob, Doc[i].ent_type Detect and label named entities.
textcat TextCategorizer Doc.cats Assign document labels.
... custom components Doc._.xxx, Token._.xxx, Span._.xxx Assign custom attributes, methods or properties.

The processing pipeline always depends on the statistical model and its capabilities. For example, a pipeline can only include an entity recognizer component if the model includes data to make predictions of entity labels. This is why each model will specify the pipeline to use in its meta data, as a simple list containing the component names:

"pipeline": ["tagger", "parser", "ner"]

import Accordion from 'components/accordion.js'

No