Library for word declensions

# Declensor library

Using dclua.py library you can train declension models and decline words. This will just replace suffix of the word to correspond new morphological properties you want the word to have. Here's some topics that will help you understand how it works.

## Morphological vector

Morphological vector is a vector which determines morphology properties for the lexeme. Number on each coordinate determine some property. You can use your vectors for your language, but here's the structure, which is suggested to use for Ukrainian.

### Noun vectors

Noun vectors has 2 coordinates: [number][case]. Here's the table, what means each value.

Coordinate Number Case
0 Nominative
1 Singular Genitive
2 Plural Dative
3 Accusative
4 Instrumental
5 Locative
6 Vocative

Infinitive suffix placed at [0][0].

### Verbs vectors

Noun vectors has 4 coordinates: [tense][person][number][gender].

Coordinate Tense Person Number Gender
0 First Singular Masculine
1 Present Second Plural Feminine
2 Future Third Neutral
3 Past

Infinitive suffix placed at [0][0][0][0].

Noun vectors has 3 coordinates: [gender][number][person].

Coordinate Gender Number Person
0 Singular First
1 Masculine Plural Second
2 Feminine Third
3 Neutral

Infinitive suffix placed at [0][0][0].

## Declension rule

Declension rule is a multidimensional array which contains declensed suffixes, which is indexed using morphology vectors. You can create such model for your word in this way:

rule = dclua.DeclenseTrainer.analyze({
(0,0): 'усмішка',
(1,0): 'усмішка',
(1,1): 'усмішки',
(1,2): 'усмішці',
#...
(2,6): 'усмішки'
});


Now the rule will look like this:

rule[0][0] == 'ка'
rule[1][0] == 'ка'
rule[1][1] == 'ки'
rule[1][2] == 'ці'
#...
rule[2][6] == 'ки'


Every word has its suffix, so you need to create rule for each of them in order to use in the future.

analyze method also accept minsize argument, which determine size of the minimal producing suffix.

## Word declension

Once you have model (bundle of rules) for different suffixes, you can use them to decline words. The syntax is following:

Declensor.declense(str word, tuple newmporph, tuple morphology=None)


Suppose, you have model variable, which contains models for all suffixes we want. Then you can decline words in the following way:

>>> dcl = dclua.Declensor(model)
>>> dcl.declense('сонцю', (1,1))
<<< 'сонця'


The morphology vector of given word will be recognized automatically, so it may take some time to found appropriate declension model in models. If you already know the morphology of the word you want to declense, assign it to the morphology argument:

>>> dcl = dclua.Declensor(model)
>>> dcl.declense('сонцю', (1,1), morphology=(1,2))
<<< 'сонця'


## Train your model

In order to train your model you can use template from template.py in this directory.

### Generalizing model

Sometimes suffix in a model can appear in slight variations. For example, aab, aac: only the last letter is different. You can set up groups of letters, which can differ in such cases, and generalize your model according to this groups. Example of using:

>>> dclua.DeclenseTrainer.generalizeModel(
...    model = [
...        [["она"], ["они"], ["онів"]],
...        [["ова"], ["ови"], ["овів"]],
...    ],
...    groups = [
...        ["н", "в", "п", "м"]
...    ],
...    threshold=.3
... )
...
<<< [
...     [
...         [['она'], ['они'], ['онів']],
...         [['ова'], ['ови'], ['овів']],
...         [['опа'], ['опи'], ['опів']],
...         [['ома'], ['оми'], ['омів']]
...     ]
... ]


Threshold parameter is a ratio between amount of rules, which can be generalized to some group and size of that group. It's equal to .3 by default, so if there are less then .3 * size_of_group rules, they won't be generalized.

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