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61 lines
5.1 KiB
Markdown
61 lines
5.1 KiB
Markdown
Every language is different – and usually full of **exceptions and special
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cases**, especially amongst the most common words. Some of these exceptions are
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shared across languages, while others are **entirely specific** – usually so
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specific that they need to be hard-coded. The
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[`lang`](https://github.com/explosion/spaCy/tree/master/spacy/lang) module
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contains all language-specific data, organized in simple Python files. This
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makes the data easy to update and extend.
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The **shared language data** in the directory root includes rules that can be
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generalized across languages – for example, rules for basic punctuation, emoji,
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emoticons, single-letter abbreviations and norms for equivalent tokens with
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different spellings, like `"` and `”`. This helps the models make more accurate
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predictions. The **individual language data** in a submodule contains rules that
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are only relevant to a particular language. It also takes care of putting
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together all components and creating the `Language` subclass – for example,
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`English` or `German`.
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> ```python
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> from spacy.lang.en import English
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> from spacy.lang.de import German
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>
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> nlp_en = English() # Includes English data
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> nlp_de = German() # Includes German data
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> ```
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| Name | Description |
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| ---------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| **Stop words**<br />[`stop_words.py`][stop_words.py] | List of most common words of a language that are often useful to filter out, for example "and" or "I". Matching tokens will return `True` for `is_stop`. |
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| **Tokenizer exceptions**<br />[`tokenizer_exceptions.py`][tokenizer_exceptions.py] | Special-case rules for the tokenizer, for example, contractions like "can't" and abbreviations with punctuation, like "U.K.". |
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| **Norm exceptions**<br />[`norm_exceptions.py`][norm_exceptions.py] | Special-case rules for normalizing tokens to improve the model's predictions, for example on American vs. British spelling. |
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| **Punctuation rules**<br />[`punctuation.py`][punctuation.py] | Regular expressions for splitting tokens, e.g. on punctuation or special characters like emoji. Includes rules for prefixes, suffixes and infixes. |
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| **Character classes**<br />[`char_classes.py`][char_classes.py] | Character classes to be used in regular expressions, for example, latin characters, quotes, hyphens or icons. |
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| **Lexical attributes**<br />[`lex_attrs.py`][lex_attrs.py] | Custom functions for setting lexical attributes on tokens, e.g. `like_num`, which includes language-specific words like "ten" or "hundred". |
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| **Syntax iterators**<br />[`syntax_iterators.py`][syntax_iterators.py] | Functions that compute views of a `Doc` object based on its syntax. At the moment, only used for [noun chunks](/usage/linguistic-features#noun-chunks). |
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| **Lemmatizer**<br />[`lemmatizer.py`][lemmatizer.py] | Lemmatization rules or a lookup-based lemmatization table to assign base forms, for example "be" for "was". |
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| **Tag map**<br />[`tag_map.py`][tag_map.py] | Dictionary mapping strings in your tag set to [Universal Dependencies](http://universaldependencies.org/u/pos/all.html) tags. |
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| **Morph rules**<br />[`morph_rules.py`][morph_rules.py] | Exception rules for morphological analysis of irregular words like personal pronouns. |
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[stop_words.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/en/stop_words.py
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[tokenizer_exceptions.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/de/tokenizer_exceptions.py
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[norm_exceptions.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/norm_exceptions.py
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[punctuation.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/punctuation.py
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[char_classes.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/char_classes.py
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[lex_attrs.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/en/lex_attrs.py
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[syntax_iterators.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/en/syntax_iterators.py
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[lemmatizer.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/de/lemmatizer.py
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[tag_map.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/en/tag_map.py
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[morph_rules.py]:
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https://github.com/explosion/spaCy/tree/master/spacy/lang/en/morph_rules.py
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