//- 💫 DOCS > USAGE > WHAT'S NEW IN V2.0

include ../../_includes/_mixins

p
    |  We also re-wrote a large part of the documentation and usage workflows,
    |  and added more examples.

+h(2, "features") New features

+h(3, "features-displacy") displaCy visualizer with Jupyter support

+aside-code("Example").
    from spacy import displacy
    doc = nlp(u'This is a sentence about Facebook.')
    displacy.serve(doc, style='dep') # run the web server
    html = displacy.render(doc, style='ent') # generate HTML

p
    |  Our popular dependency and named entity visualizers are now an official
    |  part of the spaCy library! displaCy can run a simple web server, or
    |  generate raw HTML markup or SVG files to be exported. You can pass in one
    |  or more docs, and customise the style. displaCy also auto-detects whether
    |  you're running #[+a("https://jupyter.org") Jupyter] and will render the
    |  visualizations in your notebook.

+infobox
    |  #[strong API:] #[+api("displacy") #[code displacy]]
    |  #[strong Usage:] #[+a("/docs/usage/visualizers") Visualizing spaCy]

+h(3, "features-loading") Loading

+aside-code("Example").
    nlp = spacy.load('en') # shortcut link
    nlp = spacy.load('en_core_web_sm') # package
    nlp = spacy.load('/path/to/en') # unicode path
    nlp = spacy.load(Path('/path/to/en')) # pathlib Path

p
    |  The improved #[code spacy.load] makes loading models easier and more
    |  transparent. You can load a model by supplying its
    |  #[+a("/docs/usage/models#usage") shortcut link], the name of an installed
    |  #[+a("/docs/usage/saving-loading#generating") model package], a unicode
    |  path or a #[code Path]-like object. spaCy will try resolving the load
    |  argument in this order. The #[code path] keyword argument is now deprecated.

p
    |  The #[code Language] class to initialise will be determined based on the
    |  model's settings. If no model is found, spaCy will let you know and won't
    |  just return an empty #[code Language] object anymore. If you want a blank
    |  language, you can always import the class directly, e.g.
    |  #[code from spacy.lang.en import English].

+infobox
    |  #[strong API:] #[+api("spacy#load") #[code spacy.load]]
    |  #[strong Usage:] #[+a("/docs/usage/saving-loading") Saving and loading]

+h(3, "features-language") Improved language data and lazy loading

p
    |  Language-specfic data now lives in its own submodule, #[code spacy.lang].
    |  Languages are lazy-loaded, i.e. only loaded when you import a
    |  #[code Language] class, or load a model that initialises one. This allows
    |  languages to contain more custom data, e.g. lemmatizer lookup tables, or
    |  complex regular expressions. The language data has also been tidied up
    |  and simplified. It's now also possible to overwrite the functions that
    |  compute lexical attributes like #[code like_num], and supply
    |  language-specific syntax iterators, e.g. to determine noun chunks.

+infobox
    |  #[strong Code:] #[+src(gh("spaCy", "spacy/lang")) spacy/lang]
    |  #[strong Usage:] #[+a("/docs/usage/adding-languages") Adding languages]

+h(3, "features-pipelines") Improved processing pipelines

+aside-code("Example").
    from spacy.language import Language
    nlp = Language(pipeline=['token_vectors', 'tags',
                             'dependencies'])

+infobox
    |  #[strong API:] #[+api("language") #[code Language]]
    |  #[strong Usage:] #[+a("/docs/usage/processing-text") Processing text]

+h(3, "features-lemmatizer") Simple lookup-based lemmatization

+aside-code("Example").
    LOOKUP = {
        "aba": "abar",
        "ababa": "abar",
        "ababais": "abar",
        "ababan": "abar",
        "ababanes": "ababán"
    }

p
    |  spaCy now supports simple lookup-based lemmatization. The data is stored
    |  in a dictionary mapping a string to its lemma. To determine a token's
    |  lemma, spaCy simply looks it up in the table. The lookup lemmatizer can
    |  be imported from #[code spacy.lemmatizerlookup]. It's initialised with
    |  the lookup table, and should be returned by the #[code create_lemmatizer]
    |  classmethod of the language's defaults.

+infobox
    |  #[strong API:] #[+api("language") #[code Language]]
    |  #[strong Usage:] #[+a("/docs/usage/adding-languages") Adding languages]

+h(3, "features-matcher") Revised matcher API

+aside-code("Example").
    from spacy.matcher import Matcher
    from spacy.attrs import LOWER, IS_PUNCT
    matcher = Matcher(nlp.vocab)
    matcher.add('HelloWorld', None,
                [{LOWER: 'hello'}, {IS_PUNCT: True}, {LOWER: 'world'}],
                [{LOWER: 'hello'}, {LOWER: 'world'}])
    assert len(matcher) == 1
    assert 'HelloWorld' in matcher

p
    |  Patterns can now be added to the matcher by calling
    |  #[+api("matcher-add") #[code matcher.add()]] with a match ID, an optional
    |  callback function to be invoked on each match, and one or more patterns.
    |  This allows you to write powerful, pattern-specific logic using only one
    |  matcher. For example, you might only want to merge some entity types,
    |  and set custom flags for other matched patterns.

+infobox
    |  #[strong API:] #[+api("matcher") #[code Matcher]]
    |  #[strong Usage:] #[+a("/docs/usage/rule-based-matching") Rule-based matching]

+h(3, "features-serializer") Serialization

+infobox
    |  #[strong API:] #[+api("serializer") #[code Serializer]]
    |  #[strong Usage:] #[+a("/docs/usage/saving-loading") Saving and loading]

+h(3, "features-models") Neural network models for English, German, French and Spanish

+infobox
    |  #[strong Details:] #[+src(gh("spacy-models")) spacy-models]
    |  #[strong Usage:] #[+a("/docs/usage/models") Models]

+h(2, "incompat") Backwards incompatibilities

+table(["Old", "New"])
    +row
        +cell
            |  #[code spacy.en]
            |  #[code spacy.xx]
        +cell
            |  #[code spacy.lang.en]
            |  #[code spacy.lang.xx]

    +row
        +cell #[code spacy.orth]
        +cell #[code spacy.lang.xx.lex_attrs]

    +row
        +cell #[code Language.save_to_directory]
        +cell #[+api("language#to_disk") #[code Language.to_disk]]

    +row
        +cell #[code Tokenizer.load]
        +cell
            |  #[+api("tokenizer#from_disk") #[code Tokenizer.from_disk]]
            |  #[+api("tokenizer#from_bytes") #[code Tokenizer.from_bytes]]

    +row
        +cell #[code Tagger.load]
        +cell
            |  #[+api("tagger#from_disk") #[code Tagger.from_disk]]
            |  #[+api("tagger#from_bytes") #[code Tagger.from_bytes]]

    +row
        +cell #[code DependencyParser.load]
        +cell
            |  #[+api("dependencyparser#from_disk") #[code DependencyParser.from_disk]]
            |  #[+api("dependencyparser#from_bytes") #[code DependencyParser.from_bytes]]

    +row
        +cell #[code EntityRecognizer.load]
        +cell
            |  #[+api("entityrecognizer#from_disk") #[code EntityRecognizer.from_disk]]
            |  #[+api("entityrecognizer#from_bytes") #[code EntityRecognizer.from_bytes]]

    +row
        +cell
            |  #[code Vocab.load]
            |  #[code Vocab.load_lexemes]
            |  #[code Vocab.load_vectors]
            |  #[code Vocab.load_vectors_from_bin_loc]
        +cell
            |  #[+api("vocab#from_disk") #[code Vocab.from_disk]]
            |  #[+api("vocab#from_bytes") #[code Vocab.from_bytes]]

    +row
        +cell
            |  #[code Vocab.dump]
            |  #[code Vocab.dump_vectors]
        +cell
            |  #[+api("vocab#to_disk") #[code Vocab.to_disk]]
            |  #[+api("vocab#to_bytes") #[code Vocab.to_bytes]]

    +row
        +cell
            |  #[code StringStore.load]
        +cell
            |  #[+api("stringstore#from_disk") #[code StringStore.from_disk]]
            |  #[+api("stringstore#from_bytes") #[code StringStore.from_bytes]]

    +row
        +cell
            |  #[code StringStore.dump]
        +cell
            |  #[+api("stringstore#to_disk") #[code StringStore.to_disk]]
            |  #[+api("stringstore#to_bytes") #[code StringStore.to_bytes]]

    +row
        +cell #[code Matcher.load]
        +cell -

    +row
        +cell
            |  #[code Matcher.add_pattern]
            |  #[code Matcher.add_entity]
        +cell #[+api("matcher#add") #[code Matcher.add]]

    +row
        +cell #[code Matcher.get_entity]
        +cell #[+api("matcher#get") #[code Matcher.get]]

    +row
        +cell #[code Matcher.has_entity]
        +cell #[+api("matcher#contains") #[code Matcher.__contains__]]

    +row
        +cell #[code Doc.read_bytes]
        +cell

    +row
        +cell #[code Token.is_ancestor_of]
        +cell #[+api("token#is_ancestor") #[code Token.is_ancestor]]

+h(2, "migrating") Migrating from spaCy 1.x

+list
    +item Saving, loading and serialization.
    +item Processing pipelines and language data.
    +item Adding patterns and callbacks to the matcher.
    +item Models trained with spaCy 1.x.

+infobox("Some tips")
    |  Before migrating, we strongly recommend writing a few
    |  #[strong simple tests] specific to how you're using spaCy in your
    |  application. This makes it easier to check whether your code requires
    |  changes, and if so, which parts are affected.
    |  (By the way, feel free contribute your tests to
    |  #[+src(gh("spaCy", "spacy/tests")) our test suite] – this will also ensure
    |  we never accidentally introduce a bug in a workflow that's
    |  important to you.) If you've trained your own models, keep in mind that
    |  your train and runtime inputs must match. This means you'll have to
    |  #[strong retrain your models] with spaCy v2.0 to make them compatible.


+h(3, "migrating-saving-loading") Saving, loading and serialization

+h(2, "migrating") Migrating from spaCy 1.x
p
    |  Double-check all calls to #[code spacy.load()] and make sure they don't
    |  use the #[code path] keyword argument.

+code-new nlp = spacy.load('/model')
+code-old nlp = spacy.load('en', path='/model')

p
    |  Review all other code that writes state to disk or bytes.
    |  All containers, now share the same, consistent API for saving and
    |  loading. Replace saving with #[code to_disk()] or #[code to_bytes()], and
    |  loading with #[code from_disk()] and #[code from_bytes()].

+code-new.
    nlp.to_disk('/model')
    nlp.vocab.to_disk('/vocab')

+code-old.
    nlp.save_to_directory('/model')
    nlp.vocab.dump('/vocab')

+h(3, "migrating-languages") Processing pipelines and language data

p
    |  If you're importing language data or #[code Language] classes, make sure
    |  to change your import statements to import from #[code spacy.lang]. If
    |  you've added your own custom language, it needs to be moved to
    |  #[code spacy/lang/xx].

+code-new from spacy.lang.en import English
+code-old from spacy.en import English

p
    |  All components, e.g. tokenizer exceptions, are now responsible for
    |  compiling their data in the correct format. The language_data.py files
    |  have been removed

+h(3, "migrating-matcher") Adding patterns and callbacks to the matcher

p
    |  If you're using the matcher, you can now add patterns in one step. This
    |  should be easy to update – simply merge the ID, callback and patterns
    |  into one call to #[+api("matcher#add") #[code matcher.add]].

+code-new.
    matcher.add('GoogleNow', merge_phrases, [{ORTH: 'Google'}, {ORTH: 'Now'}])

+code-old.
    matcher.add_entity('GoogleNow', on_match=merge_phrases)
    matcher.add_pattern('GoogleNow', [{ORTH: 'Google'}, {ORTH: 'Now'}])

+h(3, "migrating-models") Trained models