La descarga está en progreso. Por favor, espere

La descarga está en progreso. Por favor, espere

Morphology and FSTs Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes. Morphology is the study.

Presentaciones similares


Presentación del tema: "Morphology and FSTs Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes. Morphology is the study."— Transcripción de la presentación:

1 Morphology and FSTs Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes. Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes. A morpheme is defined as the minimal meaning-bearing unit in a language. A morpheme is defined as the minimal meaning-bearing unit in a language.E.g. –The word gatos has two morphemes: gato and -s.

2 Morphology and FSTs Two important kinds of morphemes are: Stems and affixes. Two important kinds of morphemes are: Stems and affixes. –Stem: is the main morpheme of the word, supplying the main meaning. –Affixes: add additional meanings of various kinds. Affixes are further divided in: prefixes, suffixes, infixes and circumfixes. Affixes are further divided in: prefixes, suffixes, infixes and circumfixes. –Prefixes: precede the stem. –Suffixes: follow the stem. –Circumfixes: do both precede and follow the stem. –Infixes: are inserted inside the stem.

3 Morphology and FSTs Examples:English unable is formed by the prefix un- and the stem able.unable is formed by the prefix un- and the stem able.Spanish niños --> stem niño, suffix -sniños --> stem niño, suffix -s damelos --> stem da, suffix -los, infix - me-damelos --> stem da, suffix -los, infix - me-

4 Finite State Morphological Parser Features: morphological features specify additional information about the stem (e.g. plural, singular, masculine, feminine). Features: morphological features specify additional information about the stem (e.g. plural, singular, masculine, feminine).

5 Derivational Morphology Derivation is the combination of a word stem with a grammatical morpheme, usually resulting in a word of a different class. Common derivations in English Nominalization is the formation of new nouns from adjectives and verbs. Suffix Base Verb/Adjective Derived Noun -ation Computerize (V) computerization -ee Appoint (V) appointee -er kill (V) killer -ness fuzzy (A) fuzziness

6 Derivational Morphology Adjectives can also be derived from nouns and verbs: Suffix Base Noun/Verb Derived Adjective -al computation (N) computational -able embrace (V) embraceable -less clue (N) clueless

7 Finite State Morphological Parser In order to build a morphological parser we need at least the following: 1. Lexicon: the list of stems and affixes, together with the basic information about them. 2. Morphotactis: the model of morpheme ordering that explains which classes of morphemes can follow other classes of morphemes inside a word. 3. Orthographic rules: these spelling rules are used to model the changes that occur in a word, usually when two morphemes combine.

8 Finite State Morphological Parser

9 Exercises: 1. Identify the tokens that occur in the following expression (tipical of almost any programming language) and create REs that generate each of them:

10 Spanish General Knowledge (Quiz 1) Distingue los diferentes monemas: a. a.Rehabilitáramos: b. b.Expatriación: c. c.Pañuelitos: d. d.Reforestábais: e. e.Antiglobalicacion: f. f.Vivificación:

11 Spanish General Knowledge (Quiz 1) Indica el tipo de lexema que son las palabras de las siguientes frases: a. a.El estanque del parque está siempre lleno de pájaros exóticos. b. b.A mi amigo Félix le gusta coleccionar cosas raras. Andrés se levantó ayer c. c.un poco tarde y Lucía hizo lo mismo.

12 Spanish General Knowledge (Quiz 1) Indica a qué clase de palabra pertenece cada una de las palabras marcadas en las oraciones: a. a.Mi coche es rojo. b. b.La rubia era mi prima. c. c.Los coches corrían mucho. d. d.Juan y Luis siempre han sido amigos.

13 Spanish General Knowledge (Quiz 1) Busca el femenino de las siguientes frases: a. a.El presidente ecologista b. b.El psicólogo dormilón c. c.Mi cariñoso jefe d. d.El panadero alegre

14 Spanish General Knowledge (Quiz 1) Este texto periodístico tiene errores: hay adjetivos que deben ir después del sustantivo. Corrígelo. El presidente de G. ha emprendido un largo viaje diplomático por lejanos países, acompañado de su ministro de exteriores asuntos y de su joven esposa. Durante los últimos días se han producido ya numerosas anécdotas. En la inauguración de un industrial edificio, por ejemplo, alguien entregó a la esposa del presidente un redondo objeto que resultó ser un japonés reloj de pared. Pero también ha habido malos momentos. Cuando iban en el oficial coche a la inauguración de un nuevo edificio por una estrecha carretera de montaña, el coche del presidente sufrió un pequeño accidente y chocó contra una vacía casa.

15 Spanish Morphology For a detailed account of Spanish morphology consult the following page: 1. Universidad de Valéncia, España _morfologico.htm _morfologico.htm _morfologico.htm 3. puntes.htm puntes.htm puntes.htm


Descargar ppt "Morphology and FSTs Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes. Morphology is the study."

Presentaciones similares


Anuncios Google