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Improve docs on phrase pattern attributes (closes #4100) [ci skip]

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Ines Montani 2019-08-11 11:13:49 +02:00
parent 1f4d8bf77e
commit 1362f793cf
1 changed files with 19 additions and 5 deletions
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website/docs/usage/rule-based-matching.md
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@ -788,11 +788,11 @@ token pattern covering the exact tokenization of the term.
To create the patterns, each phrase has to be processed with the `nlp` object. To create the patterns, each phrase has to be processed with the `nlp` object.
If you have a mode loaded, doing this in a loop or list comprehension can easily If you have a mode loaded, doing this in a loop or list comprehension can easily
become inefficient and slow. If you only need the tokenization and lexical become inefficient and slow. If you **only need the tokenization and lexical
attributes, you can run [`nlp.make_doc`](/api/language#make_doc) instead, which attributes**, you can run [`nlp.make_doc`](/api/language#make_doc) instead,
will only run the tokenizer. For an additional speed boost, you can also use the which will only run the tokenizer. For an additional speed boost, you can also
[`nlp.tokenizer.pipe`](/api/tokenizer#pipe) method, which will process the texts use the [`nlp.tokenizer.pipe`](/api/tokenizer#pipe) method, which will process
as a stream. the texts as a stream.
```diff ```diff
- patterns = [nlp(term) for term in LOTS_OF_TERMS] - patterns = [nlp(term) for term in LOTS_OF_TERMS]
@ -825,6 +825,20 @@ for match_id, start, end in matcher(doc):
print("Matched based on lowercase token text:", doc[start:end]) print("Matched based on lowercase token text:", doc[start:end])
``` ```
<Infobox title="Important note on creating patterns" variant="warning">
The examples here use [`nlp.make_doc`](/api/language#make_doc) to create `Doc`
object patterns as efficiently as possible and without running any of the other
pipeline components. If the token attribute you want to match on are set by a
pipeline component, **make sure that the pipeline component runs** when you
create the pattern. For example, to match on `POS` or `LEMMA`, the pattern `Doc`
objects need to have part-of-speech tags set by the `tagger`. You can either
call the `nlp` object on your pattern texts instead of `nlp.make_doc`, or use
[`nlp.disable_pipes`](/api/language#disable_pipes) to disable components
selectively.
</Infobox>
Another possible use case is matching number tokens like IP addresses based on Another possible use case is matching number tokens like IP addresses based on
their shape. This means that you won't have to worry about how those string will their shape. This means that you won't have to worry about how those string will
be tokenized and you'll be able to find tokens and combinations of tokens based be tokenized and you'll be able to find tokens and combinations of tokens based