NlpToolkit-MorphologicalDisambiguation 1.0.17

Turkish Morphological Disambiguation Library

Morphological Disambiguation

    ## Task Definition
    
    Morphological disambiguation is the problem of selecting accurate morphological parse of a word given its possible parses. These parses are generated by a morphological analyzer. In morphologically rich languages like Turkish, the number of possible parses for a given word is generally more than one. Each parse is considered as a different interpretation of a single word. Each interpretation consists of a root word and sequence of inflectional and derivational suffixes. The following table illustrates different interpretations of the word ‘‘üzerine’’.
    
    üzer+Noun+A3sg+P3sg+Dat  
    üzer+Noun+A3sg+P2sg+Dat  
    üz+Verb+Pos+Aor+^DB+Adj+Zero+^DB+Noun+Zero+A3sg+P3sg+Dat  
    üz+Verb+Pos+Aor+^DB+Adj+Zero+^DB+Noun+Zero+A3sg+P2sg+Dat
    
    As seen above, the first two parses share the same root but different suffix sequences. Similarly, the last two parses also share the same root, however sequence of morphemes are different. Given a parse such as
    
    üz+Verb+Pos+Aor+^DB+Adj+Zero+^DB+Noun+Zero+A3sg+P3sg+Dat
    
    each item is separated by ‘‘+’’ is a morphological feature such as Pos or Aor. Inflectional groups are identified as sequence of morphological features separated by derivational boundaries ^DB. The sequence of inflectional groups forms the term tag. Root word plus tag is named as word form.  So, a word form is defined as follows:
    
    IGroot+IG<sub>1</sub>+^DB+IG<sub>2</sub>+^DB+...+^DB+IG<sub>n</sub>
    
    Then the morphological disambiguation problem can be defined as follows: For a given sentence represented by a sequence of words W = w<sub>1</sub><sup>n</sup> = w<sub>1</sub>, w<sub>2</sub>, ..., w<sub>n</sub>, determine the sequence of parses T = t<sub>1</sub><sup>n</sup> = t<sub>1</sub>, t<sub>2</sub>, ..., t<sub>n</sub>; where t<sub>i</sub> represents the correct parse of the word w<sub>i</sub>.
    
    ## Data Annotation
    
    ### Preparation
    
    1. Collect a set of sentences to annotate. 
    2. Each sentence in the collection must be named as xxxx.yyyyy in increasing order. For example, the first sentence to be annotated will be 0001.train, the second 0002.train, etc.
    3. Put the sentences in the same folder such as *Turkish-Phrase*.
    4. Build the [Java](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation) project and put the generated sentence-morphological-analyzer.jar file into another folder such as *Program*.
    5. Put *Turkish-Phrase* and *Program* folders into a parent folder.
    
    ### Annotation
    
    1. Open sentence-morphological-analyzer.jar file.
    2. Wait until the data load message is displayed.
    3. Click Open button in the Project menu.
    4. Choose a file for annotation from the folder *Turkish-Phrase*.  
    5. For each word in the sentence, click the word, and choose correct morphological analysis for that word.
    6. Click one of the next buttons to go to other files.
    
    ## Classification DataSet Generation
    
    After annotating sentences, you can use [DataGenerator](https://github.com/starlangsoftware/DataGenerator-Py) package to generate classification dataset for the Morphological Disambiguation task.
    
    ## Generation of ML Models
    
    After generating the classification dataset as above, one can use the [Classification](https://github.com/starlangsoftware/Classification-Py) package to generate machine learning models for the Morphological Disambiguation task.
    
    Video Lectures
    ============
    
    [<img src=https://github.com/StarlangSoftware/TurkishMorphologicalDisambiguation/blob/master/video1.jpg width="50%">](https://youtu.be/vhp6Mse1vdM)[<img src=https://github.com/StarlangSoftware/TurkishMorphologicalDisambiguation/blob/master/video2.jpg width="50%">](https://youtu.be/lkFhIKdDSvw)[<img src=https://github.com/StarlangSoftware/TurkishMorphologicalDisambiguation/blob/master/video3.jpg width="50%">](https://youtu.be/ajXkhb8Hg3c)
    
    For Developers
    ============
    
    You can also see [Cython](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-Cy), [Java](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation), [C++](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-CPP), [C](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-C), 
    [Js](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-Js), [Swift](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-Swift), or [C#](https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-CS) repository.
    
    ## Requirements
    
    * [Python 3.7 or higher](#python)
    * [Git](#git)
    
    ### Python 
    
    To check if you have a compatible version of Python installed, use the following command:
    
       	python -V
        
    You can find the latest version of Python [here](https://www.python.org/downloads/).
    
    ### Git
    
    Install the [latest version of Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
    
    ## Pip Install
    
    	pip3 install NlpToolkit-MorphologicalDisambiguation
    
    ## Download Code
    
    In order to work on code, create a fork from GitHub page. 
    Use Git for cloning the code to your local or below line for Ubuntu:
    
    	git clone <your-fork-git-link>
    
    A directory called MorphologicalDisambiguation will be created. Or you can use below link for exploring the code:
    
    	git clone https://github.com/starlangsoftware/TurkishMorphologicalDisambiguation-Py.git
    
    ## Open project with Pycharm IDE
    
    Steps for opening the cloned project:
    
    * Start IDE
    * Select **File | Open** from main menu
    * Choose `DataStructure-Py` file
    * Select open as project option
    * Couple of seconds, project will be downloaded. 
    
    Detailed Description
    ============
    
    + [Creating MorphologicalDisambiguator](#creating-morphologicaldisambiguator)
    + [Training MorphologicalDisambiguator](#training-morphologicaldisambiguator)
    + [Sentence Disambiguation](#sentence-disambiguation)
    
    ## Creating MorphologicalDisambiguator 
    
    MorphologicalDisambiguator provides Turkish morphological disambiguation. There are possible disambiguation techniques. Depending on the technique used, disambiguator can be instantiated as follows:
    
    * Using `RootFirstDisambiguation`, the one that chooses only the root amongst the given analyses
    
            morphologicalDisambiguator = RootFirstDisambiguation()
    
    * Using `RootWordStatisticsDisambiguation`, the one that chooses the root that is the most frequently used amongst the given analyses
    
            morphologicalDisambiguator = RootWordStatisticsDisambiguation()
    
    * Using `LongestRootFirstDisambiguation`, the one that chooses the longest root among the given roots
            
            morphologicalDisambiguator = LongestRootFirstDisambiguation()
    
    * Using `HmmDisambiguation`, the one that chooses using an Hmm-based algorithm
            
            morphologicalDisambiguator = HmmDisambiguation()
    
    * Using `DummyDisambiguation`, the one that chooses a random one amongst the given analyses 
         
            morphologicalDisambiguator = DummyDisambiguation()
        
    
    ## Training MorphologicalDisambiguator
    
    To train the disambiguator, an instance of `DisambiguationCorpus` object is needed. This can be instantiated and the disambiguator can be trained and saved as follows:
    
        corpus = DisambiguationCorpus("penn_treebank.txt")
        morphologicalDisambiguator.train(corpus)
        morphologicalDisambiguator.saveModel()
        
          
    ## Sentence Disambiguation
    
    To disambiguate a sentence, a `FsmMorphologicalAnalyzer` instance is required. This can be created as below, further information can be found [here](https://github.com/starlangsoftware/MorphologicalAnalysis/blob/master/README.md#creating-fsmmorphologicalanalyzer).
    
        fsm = FsmMorphologicalAnalyzer()
        
    A sentence can be disambiguated as follows: 
        
        sentence = Sentence("Yarın doktora gidecekler")
        fsmParseList = fsm.robustMorphologicalAnalysis(sentence)
        print("All parses\n")
        print("--------------------------\n")
        for i in range(len(fsmParseList)):
            print(fsmParseList[i])
        candidateParses = morphologicalDisambiguator.disambiguate(fsmParseList)
        print("Parses after disambiguation\n")
        print("--------------------------"\n)
        for i in range(candidateParses.size()):
            print(candidateParses.get(i) + "\n")
    
    Output
    
        
        All parses
        --------------------------
        yar+NOUN+A3SG+P2SG+NOM
        yar+NOUN+A3SG+PNON+GEN
        yar+VERB+POS+IMP+A2PL
        yarı+NOUN+A3SG+P2SG+NOM
        yarın+NOUN+A3SG+PNON+NOM
        
        doktor+NOUN+A3SG+PNON+DAT
        doktora+NOUN+A3SG+PNON+NOM
        
        git+VERB+POS+FUT+A3PL
        git+VERB+POS^DB+NOUN+FUTPART+A3PL+PNON+NOM
        
        Parses after disambiguation
        --------------------------
        yarın+NOUN+A3SG+PNON+NOM
        doktor+NOUN+A3SG+PNON+DAT
        git+VERB+POS+FUT+A3PL
    
    # Cite
    
    	@InProceedings{gorgunyildiz12,
    	author="G{\"o}rg{\"u}n, Onur
    	and Yildiz, Olcay Taner",
    	editor="Gelenbe, Erol
    	and Lent, Ricardo
    	and Sakellari, Georgia",
    	title="A Novel Approach to Morphological Disambiguation for Turkish",
    	booktitle="Computer and Information Sciences II",
    	year="2012",
    	publisher="Springer London",
    	address="London",
    	pages="77--83",
    	isbn="978-1-4471-2155-8"
    	}