spaCy/spacy/language.py

from __future__ import absolute_import
from warnings import warn
import pathlib

try:
    import ujson as json
except ImportError:
    import json


from .tokenizer import Tokenizer
from .vocab import Vocab
from .syntax.parser import Parser
from .tagger import Tagger
from .matcher import Matcher
from . import attrs
from . import orth
from .syntax.ner import BiluoPushDown
from .syntax.arc_eager import ArcEager

from .attrs import TAG, DEP, ENT_IOB, ENT_TYPE, HEAD


class Defaults(object):
    def __init__(self, lang, path):
        self.lang = lang
        self.path = path

    def Vectors(self):
        pass
    
    def Vocab(self, vectors=None, get_lex_attr=None):
        if get_lex_attr is None:
            get_lex_attr = self.lex_attrs()
        if vectors is None:
            vectors = self.Vectors()
        return Vocab.load(self.path, get_lex_attr=get_lex_attr, vectors=vectors)

    def Tokenizer(self, vocab):
        return Tokenizer.load(self.path, vocab) 

    def Tagger(self, vocab):
        return Tagger.load(self.path, self.vocab)

    def Parser(self, vocab):
        if (self.path / 'deps').exists():
            return Parser.load(self.path / 'deps', vocab, ArcEager)
        else:
            return None

    def Entity(self, vocab):
        if (self.path / 'ner').exists():
            return Parser.load(self.path / 'ner', vocab, BiluoPushDown)
        else:
            return None

    def Matcher(self, vocab):
        return Matcher.load(self.path, vocab)

    def Pipeline(self, nlp):
        return [
            nlp.tokenizer,
            nlp.tagger,
            nlp.parser,
            nlp.entity]

    def dep_labels(self):
        return {0: {'ROOT': True}}

    def ner_labels(self):
        return {0: {'PER': True, 'LOC': True, 'ORG': True, 'MISC': True}}

    def lex_attrs(self, *args, **kwargs):
        if 'oov_prob' in kwargs:
            oov_prob = kwargs.get('oov_prob', -20)
        else:
            with (self.path / 'vocab' / 'oov_prob').open() as file_:
                oov_prob = file_.read().strip()
        return {
            attrs.LOWER: self.lower,
            attrs.NORM: self.norm,
            attrs.SHAPE: orth.word_shape,
            attrs.PREFIX: self.prefix,
            attrs.SUFFIX: self.suffix,
            attrs.CLUSTER: self.cluster,
            attrs.PROB: lambda string: oov_prob,
            attrs.LANG: lambda string: self.lang,
            attrs.IS_ALPHA: orth.is_alpha,
            attrs.IS_ASCII: orth.is_ascii,
            attrs.IS_DIGIT: self.is_digit,
            attrs.IS_LOWER: orth.is_lower,
            attrs.IS_PUNCT: orth.is_punct,
            attrs.IS_SPACE: self.is_space,
            attrs.IS_TITLE: orth.is_title,
            attrs.IS_UPPER: orth.is_upper,
            attrs.IS_BRACKET: orth.is_bracket,
            attrs.IS_QUOTE: orth.is_quote,
            attrs.IS_LEFT_PUNCT: orth.is_left_punct,
            attrs.IS_RIGHT_PUNCT: orth.is_right_punct,
            attrs.LIKE_URL: orth.like_url,
            attrs.LIKE_NUM: orth.like_number,
            attrs.LIKE_EMAIL: orth.like_email,
            attrs.IS_STOP: self.is_stop,
            attrs.IS_OOV: lambda string: True
        }

    @staticmethod
    def lower(string):
        return string.lower()

    @staticmethod
    def norm(string):
        return string

    @staticmethod
    def prefix(string):
        return string[0]

    @staticmethod
    def suffix(string):
        return string[-3:]

    @staticmethod
    def cluster(string):
        return 0

    @staticmethod
    def is_digit(string):
        return string.isdigit()

    @staticmethod
    def is_space(string):
        return string.isspace()

    @staticmethod
    def is_stop(string):
        return 0


class Language(object):
    '''A text-processing pipeline. Usually you'll load this once per process, and
    pass the instance around your program.
    '''
    
    lang = None

    def __init__(self,
        path=None,
        vocab=True,
        tokenizer=True,
        tagger=True,
        parser=True,
        entity=True,
        matcher=True,
        serializer=True,
        vectors=True,
        pipeline=True,
        defaults=True,
        data_dir=None):
        """
        A model can be specified:

        1) by calling a Language subclass
            - spacy.en.English()

        2) by calling a Language subclass with data_dir
            - spacy.en.English('my/model/root')
            - spacy.en.English(data_dir='my/model/root')

        3) by package name
            - spacy.load('en_default')
            - spacy.load('en_default==1.0.0')

        4) by package name with a relocated package base
            - spacy.load('en_default', via='/my/package/root')
            - spacy.load('en_default==1.0.0', via='/my/package/root')
        """
        if data_dir is not None and path is None:
            warn("'data_dir' argument now named 'path'. Doing what you mean.")
            path = data_dir
        if isinstance(path, basestring):
            path = pathlib.Path(path)
        defaults = defaults if defaults is not True else self.get_defaults(self.path)
        
        self.vocab     = vocab if vocab is not True else defaults.Vocab(vectors=vectors)
        self.tokenizer = tokenizer if tokenizer is not True else defaults.Tokenizer(self.vocab)
        self.tagger    = tagger if tagger is not True else defaults.Tagger(self.vocab)
        self.entity    = entity if entity is not True else defaults.Entity(self.vocab)
        self.parser    = parser if parser is not True else defaults.Parser(self.vocab)
        self.matcher   = matcher if matcher is not True else defaults.Matcher(self.vocab)
        self.pipeline  = self.pipeline if pipeline is not True else defaults.Pipeline(self)

    def __reduce__(self):
        args = (
            self.path, 
            self.vocab,
            self.tokenizer,
            self.tagger,
            self.parser,
            self.entity,
            self.matcher
        )
        return (self.__class__, args, None, None)

    def __call__(self, text, tag=True, parse=True, entity=True):
        """Apply the pipeline to some text.  The text can span multiple sentences,
        and can contain arbtrary whitespace.  Alignment into the original string
        is preserved.
        
        Args:
            text (unicode): The text to be processed.

        Returns:
            tokens (spacy.tokens.Doc):

        >>> from spacy.en import English
        >>> nlp = English()
        >>> tokens = nlp('An example sentence. Another example sentence.')
        >>> tokens[0].orth_, tokens[0].head.tag_
        ('An', 'NN')
        """
        doc = self.pipeline[0](text)
        if self.entity and entity:
            # Add any of the entity labels already set, in case we don't have them.
            for token in doc:
                if token.ent_type != 0:
                    self.entity.add_label(token.ent_type)
        skip = {self.tagger: not tag, self.parser: not parse, self.entity: not entity}
        for proc in self.pipeline[1:]:
            if proc and not skip.get(proc):
                proc(doc)
        return doc

    def pipe(self, texts, tag=True, parse=True, entity=True, n_threads=2,
            batch_size=1000):
        skip = {self.tagger: not tag, self.parser: not parse, self.entity: not entity}
        stream = self.pipeline[0].pipe(texts,
            n_threads=n_threads, batch_size=batch_size)
        for proc in self.pipeline[1:]:
            if proc and not skip.get(proc):
                if hasattr(proc, 'pipe'):
                    stream = proc.pipe(stream, n_threads=n_threads, batch_size=batch_size)
                else:
                    stream = (proc(item) for item in stream)
        for doc in stream:
            yield doc

    def end_training(self, path=None):
        if path is None:
            path = self.path
        if self.parser:
            self.parser.model.end_training()
            self.parser.model.dump(path / 'deps' / 'model')
        if self.entity:
            self.entity.model.end_training()
            self.entity.model.dump(path / 'ner' / 'model')
        if self.tagger:
            self.tagger.model.end_training()
            self.tagger.model.dump(path / 'pos' / 'model')

        strings_loc = path / 'vocab' / 'strings.json'
        with strings_loc.open('w', encoding='utf8') as file_:
            self.vocab.strings.dump(file_)
        self.vocab.dump(path / 'vocab' / 'lexemes.bin')

        if self.tagger:
            tagger_freqs = list(self.tagger.freqs[TAG].items())
        else:
            tagger_freqs = []
        if self.parser:
            dep_freqs = list(self.parser.moves.freqs[DEP].items())
            head_freqs = list(self.parser.moves.freqs[HEAD].items())
        else:
            dep_freqs = []
            head_freqs = []
        if self.entity:
            entity_iob_freqs = list(self.entity.moves.freqs[ENT_IOB].items())
            entity_type_freqs = list(self.entity.moves.freqs[ENT_TYPE].items())
        else:
            entity_iob_freqs = []
            entity_type_freqs = []
        with (path / 'vocab' / 'serializer.json').open('w') as file_:
            file_.write(
                json.dumps([
                    (TAG, tagger_freqs),
                    (DEP, dep_freqs),
                    (ENT_IOB, entity_iob_freqs),
                    (ENT_TYPE, entity_type_freqs),
                    (HEAD, head_freqs)
                ]))

        
    def get_defaults(self, path):
        return Defaults(path)