mirror of https://github.com/searxng/searxng
commit
966e9c3c5d
@ -0,0 +1,8 @@
|
|||||||
|
.. _autodetect search language:
|
||||||
|
|
||||||
|
======================
|
||||||
|
Search language plugin
|
||||||
|
======================
|
||||||
|
|
||||||
|
.. automodule:: searx.plugins.autodetect_search_language
|
||||||
|
:members:
|
Binary file not shown.
@ -0,0 +1,115 @@
|
|||||||
|
# SPDX-License-Identifier: AGPL-3.0-or-later
|
||||||
|
# lint: pylint
|
||||||
|
"""Plugin to detect the search language from the search query.
|
||||||
|
|
||||||
|
The language detection is done by using the fastText_ library (`python
|
||||||
|
fasttext`_). fastText_ distributes the `language identification model`_, for
|
||||||
|
reference:
|
||||||
|
|
||||||
|
- `FastText.zip: Compressing text classification models`_
|
||||||
|
- `Bag of Tricks for Efficient Text Classification`_
|
||||||
|
|
||||||
|
The `language identification model`_ support the language codes (ISO-639-3)::
|
||||||
|
|
||||||
|
af als am an ar arz as ast av az azb ba bar bcl be bg bh bn bo bpy br bs bxr
|
||||||
|
ca cbk ce ceb ckb co cs cv cy da de diq dsb dty dv el eml en eo es et eu fa
|
||||||
|
fi fr frr fy ga gd gl gn gom gu gv he hi hif hr hsb ht hu hy ia id ie ilo io
|
||||||
|
is it ja jbo jv ka kk km kn ko krc ku kv kw ky la lb lez li lmo lo lrc lt lv
|
||||||
|
mai mg mhr min mk ml mn mr mrj ms mt mwl my myv mzn nah nap nds ne new nl nn
|
||||||
|
no oc or os pa pam pfl pl pms pnb ps pt qu rm ro ru rue sa sah sc scn sco sd
|
||||||
|
sh si sk sl so sq sr su sv sw ta te tg th tk tl tr tt tyv ug uk ur uz vec vep
|
||||||
|
vi vls vo wa war wuu xal xmf yi yo yue zh
|
||||||
|
|
||||||
|
The `language identification model`_ is harmonized with the SearXNG's language
|
||||||
|
(locale) model. General conditions of SearXNG's locale model are:
|
||||||
|
|
||||||
|
a. SearXNG's locale of a query is passed to the
|
||||||
|
:py:obj:`searx.locales.get_engine_locale` to get a language and/or region
|
||||||
|
code that is used by an engine.
|
||||||
|
|
||||||
|
b. SearXNG and most of the engines do not support all the languages from
|
||||||
|
language model and there might be also a discrepancy in the ISO-639-3 and
|
||||||
|
ISO-639-2 handling (:py:obj:`searx.locales.get_engine_locale`). Further
|
||||||
|
more, in SearXNG the locales like ``zh-TH`` (``zh-CN``) are mapped to
|
||||||
|
``zh_Hant`` (``zh_Hans``).
|
||||||
|
|
||||||
|
Conclusion: This plugin does only auto-detect the languages a user can select in
|
||||||
|
the language menu (:py:obj:`supported_langs`).
|
||||||
|
|
||||||
|
SearXNG's locale of a query comes from (*highest wins*):
|
||||||
|
|
||||||
|
1. The ``Accept-Language`` header from user's HTTP client.
|
||||||
|
2. The user select a locale in the preferences.
|
||||||
|
3. The user select a locale from the menu in the query form (e.g. ``:zh-TW``)
|
||||||
|
4. This plugin is activated in the preferences and the locale (only the language
|
||||||
|
code / none region code) comes from the fastText's language detection.
|
||||||
|
|
||||||
|
Conclusion: There is a conflict between the language selected by the user and
|
||||||
|
the language from language detection of this plugin. For example, the user
|
||||||
|
explicitly selects the German locale via the search syntax to search for a term
|
||||||
|
that is identified as an English term (try ``:de-DE thermomix``, for example).
|
||||||
|
|
||||||
|
.. hint::
|
||||||
|
|
||||||
|
To SearXNG maintainers; please take into account: under some circumstances
|
||||||
|
the auto-detection of the language of this plugin could be detrimental to
|
||||||
|
users expectations. Its not recommended to activate this plugin by
|
||||||
|
default. It should always be the user's decision whether to activate this
|
||||||
|
plugin or not.
|
||||||
|
|
||||||
|
.. _fastText: https://fasttext.cc/
|
||||||
|
.. _python fasttext: https://pypi.org/project/fasttext/
|
||||||
|
.. _language identification model: https://fasttext.cc/docs/en/language-identification.html
|
||||||
|
.. _Bag of Tricks for Efficient Text Classification: https://arxiv.org/abs/1607.01759
|
||||||
|
.. _`FastText.zip: Compressing text classification models`: https://arxiv.org/abs/1612.03651
|
||||||
|
|
||||||
|
"""
|
||||||
|
|
||||||
|
from flask_babel import gettext
|
||||||
|
import fasttext
|
||||||
|
import babel
|
||||||
|
|
||||||
|
from searx.data import data_dir
|
||||||
|
from searx.languages import language_codes
|
||||||
|
|
||||||
|
# Monkey patch: prevent fasttext from showing a (useless) warning when loading a
|
||||||
|
# model.
|
||||||
|
fasttext.FastText.eprint = lambda x: None
|
||||||
|
|
||||||
|
name = gettext('Autodetect search language')
|
||||||
|
description = gettext('Automatically detect the query search language and switch to it.')
|
||||||
|
preference_section = 'general'
|
||||||
|
default_on = False
|
||||||
|
|
||||||
|
lang_model: fasttext.FastText._FastText = None
|
||||||
|
"""fasttext model to predict laguage of a search term"""
|
||||||
|
|
||||||
|
supported_langs = set()
|
||||||
|
"""Languages supported by most searxng engines (:py:obj:`searx.languages.language_codes`)."""
|
||||||
|
|
||||||
|
|
||||||
|
def get_model():
|
||||||
|
# lazy load, in order to to save memory
|
||||||
|
global lang_model # pylint: disable=global-statement
|
||||||
|
if lang_model is None:
|
||||||
|
lang_model = fasttext.load_model(str(data_dir / 'lid.176.ftz'))
|
||||||
|
return lang_model
|
||||||
|
|
||||||
|
|
||||||
|
def pre_search(request, search): # pylint: disable=unused-argument
|
||||||
|
prediction = get_model().predict(search.search_query.query, k=1, threshold=0.3)
|
||||||
|
if prediction:
|
||||||
|
lang = prediction[0][0].split('__label__')[1]
|
||||||
|
if lang in supported_langs:
|
||||||
|
search.search_query.lang = lang
|
||||||
|
try:
|
||||||
|
search.search_query.locale = babel.Locale.parse(lang)
|
||||||
|
except babel.core.UnknownLocaleError:
|
||||||
|
pass
|
||||||
|
return True
|
||||||
|
|
||||||
|
|
||||||
|
def init(app, settings): # pylint: disable=unused-argument
|
||||||
|
for searxng_locale in language_codes:
|
||||||
|
supported_langs.add(searxng_locale[0].split('-')[0])
|
||||||
|
return True
|
Loading…
Reference in New Issue