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Bindings to UDPipe library

Project Description

ufal.udpipe

The ufal.udpipe is a Python binding to UDPipe library <http://ufal.mff.cuni.cz/udpipe>.

The bindings is a straightforward conversion of the C++ bindings API. In Python 2, strings can be both unicode and UTF-8 encoded str, and the library always produces unicode. In Python 3, strings must be only str.

Wrapped C++ API

The C++ API being wrapped follows. For a API reference of the original C++ API, see <http://ufal.mff.cuni.cz/udpipe/api-reference>.

Helper Structures
-----------------

  typedef vector<int> Children;

  typedef vector<string> Comments;

  class ProcessingError {
  public:
    bool occurred();
    string message;
  };

  class Token {
   public:
    string form;
    string misc;

    Token(const string& form = string(), const string& misc = string());

    // CoNLL-U defined SpaceAfter=No feature
    bool getSpaceAfter() const;
    void setSpaceAfter(bool space_after);

    // UDPipe-specific all-spaces-preserving SpacesBefore and SpacesAfter features
    string getSpacesBefore() const;
    void setSpacesBefore(const string& spaces_before);
    string getSpacesAfter() const;
    void setSpacesAfter(const string& spaces_after);
    string getSpacesInToken() const;
    void setSpacesInToken(const string& spaces_in_token);

    // UDPipe-specific TokenRange feature
    bool getTokenRange() const;
    size_t getTokenRangeStart() const;
    size_t getTokenRangeEnd() const;
    void setTokenRange(size_t start, size_t end);
  };

  class Word : public Token {
   public:
    // form and misc are inherited from token
    int id;         // 0 is root, >0 is sentence word, <0 is undefined
    string lemma;   // lemma
    string upostag; // universal part-of-speech tag
    string xpostag; // language-specific part-of-speech tag
    string feats;   // list of morphological features
    int head;       // head, 0 is root, <0 is undefined
    string deprel;  // dependency relation to the head
    string deps;    // secondary dependencies

    Children children;

    Word(int id = -1, const string& form = string());
  };
  typedef vector<Word> Words;

  class MultiwordToken : public Token {
   public:
    // form and misc are inherited from token
    int idFirst, idLast;

    MultiwordToken(int id_first = -1, int id_last = -1, const string& form = string(), const string& misc = string());
  };
  typedef vector<MultiwordToken> MultiwordTokens;

  class EmptyNode {
   public:
    int id;          // 0 is root, >0 is sentence word, <0 is undefined
    int index;       // index for the current id, should be numbered from 1, 0=undefined
    string form;     // form
    string lemma;    // lemma
    string upostag;  // universal part-of-speech tag
    string xpostag;  // language-specific part-of-speech tag
    string feats;    // list of morphological features
    string deps;     // secondary dependencies
    string misc;     // miscellaneous information

    EmptyNode(int id = -1, int index = 0) : id(id), index(index) {}
  };
  typedef vector<empty_node> EmptyNodes;

  class Sentence {
   public:
    Sentence();

    Words words;
    MultiwordTokens multiwordTokens;
    EmptyNodes emptyNodes;
    Comments comments;
    static const string rootForm;

    // Basic sentence modifications
    bool empty();
    void clear();
    virtual Word& addWord(const char* form);
    void setHead(int id, int head, const string& deprel);
    void unlinkAllWords();

    // CoNLL-U defined comments
    bool getNewDoc() const;
    string getNewDocId() const;
    void setNewDoc(bool new_doc, const string& id = string());
    bool getNewPar() const;
    string getNewParId() const;
    void setNewPar(bool new_par, const string& id = string());

    string getSentId() const;
    void setSentId(const string& id);
    string getText() const;
    void setText(const string& id);
  };
  typedef vector<Sentence> Sentences;


Main Classes
------------

  class InputFormat {
   public:
    virtual void resetDocument(const string& id = string());
    virtual void setText(const char* text);
    virtual bool nextSentence(Sentence& s, ProcessingError* error = nullptr);

    static InputFormat* newInputFormat(const string& name);
    static InputFormat* newConlluInputFormat(const string& id = string());
    static InputFormat* newGenericTokenizerInputFormat(const string& id = string());
    static InputFormat* newHorizontalInputFormat(const string& id = string());
    static InputFormat* newVerticalInputFormat(const string& id = string());

    static InputFormat* newPresegmentedTokenizer(InputFormat tokenizer);

    static const string CONLLU_V1;
    static const string CONLLU_V2;
    static const string GENERIC_TOKENIZER_NORMALIZED_SPACES;
    static const string GENERIC_TOKENIZER_PRESEGMENTED;
    static const string GENERIC_TOKENIZER_RANGES;
  };

  class OutputFormat {
   public:
    virtual string writeSentence(const Sentence& s);
    virtual string finishDocument();

    static OutputFormat* newOutputFormat(const string& name);
    static OutputFormat* newConlluOutputFormat(const string& options = string());
    static OutputFormat* newMatxinOutputFormat(const string& options = string());
    static OutputFormat* newHorizontalOutputFormat(const string& options = string());
    static OutputFormat* newPlaintextOutputFormat(const string& options = string());
    static OutputFormat* newVerticalOutputFormat(const string& options = string());

    static const string CONLLU_V1;
    static const string CONLLU_V2;
    static const string HORIZONTAL_PARAGRAPHS;
    static const string PLAINTEXT_NORMALIZED_SPACES;
    static const string VERTICAL_PARAGRAPHS;
  };

  class Model {
   public:
    static Model* load(const char* fname);

    virtual InputFormat* newTokenizer(const string& options) const;
    virtual bool tag(Sentence& s, const string& options, ProcessingError* error = nullptr) const;
    virtual bool parse(Sentence& s, const string& options, ProcessingError* error) const;

    static const string DEFAULT;
    static const string TOKENIZER_PRESEGMENTED;
  };

  class Pipeline {
   public:
    Pipeline(const Model* m, const string& input, const string& tagger, const string& parser, const string& output);

    void setModel(const Model* m);
    void setInput(const string& input);
    void setTagger(const string& tagger);
    void setParser(const string& parser);
    void setOutput(const string& output);

    void setImmediate(bool immediate);
    void setDocumentId(const string& document_id);

    string process(const string& data, ProcessingError* error = nullptr) const;

    static const string DEFAULT;
    static const string NONE;
  };

  class Trainer {
   public:

    static string train(const string& method, const Sentences& train, const Sentences& heldout,
                        const string& tokenizer, const string& tagger, const string& parser,
                        ProcessingError* error = nullptr);

    static const string DEFAULT;
    static const string NONE;
  };

  class Evaluator {
   public:
    Evaluator(const Model* m, const string& tokenizer, const string& tagger, const string& parser);

    void setModel(const Model* m);
    void setTokenizer(const string& tokenizer);
    void setTagger(const string& tagger);
    void setParser(const string& parser);

    string evaluate(const string& data, ProcessingError* error = nullptr) const;

    static const string DEFAULT;
    static const string NONE;
  };

  class Version {
   public:
    unsigned major;
    unsigned minor;
    unsigned patch;
    string prerelease;

    // Returns current version.
    static version current();
  };

Examples

run_udpipe

Simple pipeline loading data (tokenizing on request), tagging, parsing and writing to specified output format:

import sys

from ufal.udpipe import Model, Pipeline, ProcessingError # pylint: disable=no-name-in-module

# In Python2, wrap sys.stdin and sys.stdout to work with unicode.
if sys.version_info[0] < 3:
    import codecs
    import locale
    encoding = locale.getpreferredencoding()
    sys.stdin = codecs.getreader(encoding)(sys.stdin)
    sys.stdout = codecs.getwriter(encoding)(sys.stdout)

if len(sys.argv) < 4:
    sys.stderr.write('Usage: %s input_format(tokenize|conllu|horizontal|vertical) output_format(conllu) model_file\n' % sys.argv[0])
    sys.exit(1)

sys.stderr.write('Loading model: ')
model = Model.load(sys.argv[3])
if not model:
    sys.stderr.write("Cannot load model from file '%s'\n" % sys.argv[3])
    sys.exit(1)
sys.stderr.write('done\n')

pipeline = Pipeline(model, sys.argv[1], Pipeline.DEFAULT, Pipeline.DEFAULT, sys.argv[2])
error = ProcessingError()

# Read whole input
text = ''.join(sys.stdin.readlines())

# Process data
processed = pipeline.process(text, error)
if error.occurred():
    sys.stderr.write("An error occurred when running run_udpipe: ")
    sys.stderr.write(error.message)
    sys.stderr.write("\n")
    sys.exit(1)
sys.stdout.write(processed)

AUTHORS

Milan Straka <straka@ufal.mff.cuni.cz>

Release History

Release History

This version
History Node

1.1.0.2

History Node

1.1.0.1

History Node

1.0.0.1

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