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detect aspirated 'h' in French words

Project description

haspirater -- a toolkit to detect initial aspirated 'h' in French words Copyright (C) 2011-2019 by Antoine Amarilli Repository URL: https://gitlab.com/a3nm/haspirater

== 0. License (MIT license) ==

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

== 1. Features ==

haspirater is a tool to detect if a French word starts with an aspirated 'h' or not. It is not based on a list of words but on a trie trained from a corpus, which ensures that it should do a reasonable job for unseen words which are similar to known ones, without carrying a big exceptions list. The json trie used is less than 10 Kio, and the lookup script is 40 lines of Python.

== 2. Usage ==

If you just want to use the included training data, you can either run haspirater.py, giving one word per line in stdin and getting the annotation on stdout, or you can import it in a Python file and call haspirater.lookup(word) which returns True if the leading 'h' is aspirated, False if it isn't, and raises ValueError if there is no leading 'h'.

Please report any errors in the training data, keeping in mind than only one possibility is returned even when both are attested.

== 3. Training ==

The training data used by haspirater.py is loaded at runtime from the haspirater.json file which has been trained from French texts taken from Project Gutenberg <www.gutenberg.org>, from the list in the Wikipedia article http://fr.wikipedia.org/wiki/H_aspir%C3%A9, from the categories in the French Wiktionary http://fr.wiktionary.org/wiki/Catégorie:Mots_à_h_muet and http://fr.wiktionary.org/wiki/Catégorie:Mots_à_h_aspiré and from a custom set of exceptions. If you want to create your own data, or adapt the approach here to other linguistic features, read on.

The master script is make.sh which accepts French text on stdin and a list of exceptions files as arguments. Included exception files are additions and wikipedia. These exceptions are just like training data and are not stored as-is; they are just piped later on in the training phase. make.sh produces on stdout the json trie. Thus, you would run something like:

$ cat corpus | ./make.sh exceptions > haspirater/haspirater.json

== 4. Training details ==

=== 4.1. Corpus preparation (prepare.sh) ===

This script removes useless characters, and separates words (one per line).

=== 4.2. Property inference (detect.pl) ===

This script examines the output, notices occurrences of words for which the preceding word indicates the aspirated or non-aspirated status, and outputs them.

The format used for the output of this phase is the same as that of the exceptions file.

=== 4.3. Removing leading 'h' ===

This is a quick optimization.

=== 4.4. Trie construction (buildtrie.py) ===

The occurrences are read one after the other and are used to populate a trie carrying the value count for each occurrence having a given prefix.

=== 4.5. Trie compression (compresstrie.py) ===

The trie is then compressed by removing branches which are not needed to infer a value. This step could be followed by a removal of branches with very little dissent from the majority value if we wanted to reduce the trie size at the expense of accuracy: for aspirated h, this isn't needed.

=== 4.6. Trie majority relabeling (majoritytrie.py) ===

Instead of the list of values with their counts, nodes are relabeled to carry the most common value. This step could be skipped to keep confidence values. We also drop useless leaf nodes there.

== 5. Additional stuff ==

You can use trie2dot.py to convert the output of buildtrie.py or compresstrie.py in the dot format which can be used to render a drawing of the trie ("trie2dot.py h 0 1"). The result of such a drawing is given as haspirater.pdf (before majoritytrie.py: contains frequency info, but more nodes) and haspirater_majority.pdf (no frequency, less nodes).

You can use leavestrie.py to get the leaves of a trie.

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