nltk.stem.snowball.RussianStemmer

class documentation

class RussianStemmer(_LanguageSpecificStemmer): (source)

Constructor: RussianStemmer(ignore_stopwords)

The Russian Snowball stemmer.

Note
A detailed description of the Russian stemming algorithm can be found under http://snowball.tartarus.org/algorithms/russian/stemmer.html

Method	`stem`	Stem a Russian word and return the stemmed form.
Method	`__cyrillic_to_roman`	Transliterate a Russian word into the Roman alphabet.
Method	`__regions_russian`	Return the regions RV and R2 which are used by the Russian stemmer.
Method	`__roman_to_cyrillic`	Transliterate a Russian word back into the Cyrillic alphabet.
Class Variable	`__adjectival_suffixes`	Suffixes to be deleted.
Class Variable	`__derivational_suffixes`	Suffixes to be deleted.
Class Variable	`__noun_suffixes`	Suffixes to be deleted.
Class Variable	`__perfective_gerund_suffixes`	Suffixes to be deleted.
Class Variable	`__reflexive_suffixes`	Suffixes to be deleted.
Class Variable	`__superlative_suffixes`	Suffixes to be deleted.
Class Variable	`__verb_suffixes`	Suffixes to be deleted.

Inherited from _LanguageSpecificStemmer:

Method	`__init__`	Undocumented
Method	`__repr__`	Print out the string representation of the respective class.
Instance Variable	`stopwords`	Undocumented

def stem(self, word): (source) ¶

overrides nltk.stem.api.StemmerI.stem

Stem a Russian word and return the stemmed form.

Parameters
word:str or unicode	The word that is stemmed.
Returns
unicode	The stemmed form.

def __cyrillic_to_roman(self, word): (source) ¶

Transliterate a Russian word into the Roman alphabet.

A Russian word whose letters consist of the Cyrillic alphabet are transliterated into the Roman alphabet in order to ease the forthcoming stemming process.

Parameters
word:unicode	The word that is transliterated.
Returns
unicode	the transliterated word.
Note
This helper method is invoked by the stem method of the subclass RussianStemmer. It is not to be invoked directly!

def __regions_russian(self, word): (source) ¶

Return the regions RV and R2 which are used by the Russian stemmer.

In any word, RV is the region after the first vowel, or the end of the word if it contains no vowel.

R2 is the region after the first non-vowel following a vowel in R1, or the end of the word if there is no such non-vowel.

R1 is the region after the first non-vowel following a vowel, or the end of the word if there is no such non-vowel.

Parameters
word:str or unicode	The Russian word whose regions RV and R2 are determined.
Returns
tuple	the regions RV and R2 for the respective Russian word.
Note
This helper method is invoked by the stem method of the subclass RussianStemmer. It is not to be invoked directly!

def __roman_to_cyrillic(self, word): (source) ¶

Transliterate a Russian word back into the Cyrillic alphabet.

A Russian word formerly transliterated into the Roman alphabet in order to ease the stemming process, is transliterated back into the Cyrillic alphabet, its original form.

Parameters
word:str or unicode	The word that is transliterated.
Returns
unicode	word, the transliterated word.
Note
This helper method is invoked by the stem method of the subclass RussianStemmer. It is not to be invoked directly!

__adjectival_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__derivational_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__noun_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__perfective_gerund_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__reflexive_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__superlative_suffixes: tuple = (source) ¶

Suffixes to be deleted.

__verb_suffixes: tuple = (source) ¶

Suffixes to be deleted.