import unittest
import re
import nltk
from nltk.tokenize import word_tokenize
from nltk import pos_tag
import pandas as pd


# Helper functions
def _require_success(test_case, condition, failure_message):
    if not condition:
        test_case._testMethodName = failure_message
        test_case.fail()

def _check_success(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
    else:
        test_case._testMethodName = failure_message
        test_case.fail()


class TestUserCode(unittest.TestCase):
    # Test that everything is imported correctly
    def test_imports(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "word_tokenize"), 
            "`word_tokenize` is not declared"
        )
        _require_success(
            self,
            user_code.word_tokenize == word_tokenize,
            "`word_tokenize` is declared, but it's not `nltk.tokenize.word_tokenize`"
        )
        _require_success(
            self, 
            hasattr(user_code, "pos_tag"), 
            "`pos_tag` is not declared"
        )
        _require_success(
            self,
            user_code.pos_tag == pos_tag,
            "`pos_tag` is declared, but it's not `nltk.pos_tag`"
        )
        _require_success(
            self,
            hasattr(user_code, "nltk"),
            "`nltk` is not declared"
        )
        _require_success(
            self,
            user_code.nltk == nltk,
            "`nltk` is declared, but it's not `nltk` library"
        )
        self._testMethodName = "imports are correct"

    # Test that required NLTK resources are downloaded
    def test_nltk_downloads(self):
        import user_code
        _require_success(
            self,
            hasattr(user_code, "nltk"),
            "`nltk` is not declared"
        )
        _require_success(
            self,
            user_code.nltk == nltk,
            "`nltk` is declared, but it's not `nltk` library"
        )
        with open("user_code.py", "r") as f:
            user_code_text = f.read()
            _require_success(
                self,
                re.search(r"nltk *\. *download *\( *'punkt_tab' *\)", user_code_text),
                "Code for downloading `'punkt_tab'` tokenizer shouldn't be modified"
            )
            _require_success(
                self,
                re.search(r"nltk *\. *download *\( *'averaged_perceptron_tagger_eng' *\)", user_code_text),
                "Code for downloading `'averaged_perceptron_tagger_eng'` is not provided"
            )
        self._testMethodName = "NLTK resources are downloaded"

    # Test original text
    def test_text(self):
        import user_code
        expected = "The central bank raised interest rates by 0.5 percentage points yesterday."
        _require_success(
            self, 
            hasattr(user_code, "text"), 
            "`text` is not declared"
        )
        _check_success(
            self,
            user_code.text == expected,
            "`text` contains correct value",
            "`text` shouldn't be modified"
        )

    # Test lowercase conversion
    def test_text_lower(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "text"), 
            "`text` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.text, str), 
            "`text` is not a string"
        )
        _require_success(
            self, 
            hasattr(user_code, "text_lower"), 
            "`text_lower` is not declared"
        )
        _check_success(
            self,
            user_code.text_lower == user_code.text.lower(),
            "`text_lower` is computed correctly",
            "`text_lower` is not the lowercase of `text`"
        )

    # Test tokenization of text_lower
    def test_tokens(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "text_lower"), 
            "`text_lower` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.text_lower, str), 
            "`text_lower` is not a string"
        )
        _require_success(
            self, 
            hasattr(user_code, "tokens"), 
            "`tokens` is not declared"
        )
        _check_success(
            self,
            user_code.tokens == word_tokenize(user_code.text_lower),
            "`tokens` is computed correctly",
            "`text_lower` is not correctly tokenized into words"
        )

    # Test pos tagging results
    def test_tagged_tokens(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "tokens"), 
            "`tokens` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.tokens, list), 
            "`tokens` is not a list"
        )
        _require_success(
            self, 
            hasattr(user_code, "tagged_tokens"), 
            "`tagged_tokens` is not declared"
        )
        _check_success(
            self,
            user_code.tagged_tokens == pos_tag(user_code.tokens),
            "`tagged_tokens` is computed correctly",
            "`tokens` are not correctly pos tagged"
        )

    # Test print statement
    def test_dataframe_print(self):
        import user_code
        _require_success(
            self,
            hasattr(user_code, "pd"),
            "`pd` is not declared"
        )
        _require_success(
            self,
            user_code.pd == pd,
            "`pd` is declared, but it's not `pandas` library"
        )
        with open("user_code.py", "r") as f:
            user_code_text = f.read()
        _check_success(
            self,
            re.search(r"print *\( *pd *. *DataFrame *\( *tagged_tokens *, *columns *= *\[ *'Token', *'POS tag' *\] *\) *\)", user_code_text),
            "print statement is correct",
            "print statement is either incorrect, or original parts were modified"
        )


if __name__ == '__main__':
    nltk.download('punkt_tab')
    nltk.download('averaged_perceptron_tagger_eng')
    unittest.main()

test_main.py

Utforska grunderna i Natural Language Processing (NLP) genom att lära dig viktiga tekniker för textförbehandling och metoder för att representera textdata. Skaffa praktisk erfarenhet av verktyg som används för att rensa, analysera och tolka textuell information. Utveckla färdigheter för att omvandla rå språkdata till strukturerade insikter och skapa en stabil grund för avancerade tillämpningar inom artificiell intelligens och maskininlärning.

Fördjupa dig i grunderna för textförbehandling för att förbereda råtext för analys. Lär dig hur man tokeniserar text, filtrerar bort stoppord och anpassar tokenisering med reguljära uttryck.

Utforska hur ord kan reduceras till sina grundformer med hjälp av stamning och lemmatisering. Behärska ordklassmärkning för att berika text med grammatisk kontext och tillämpa ordklassmedveten lemmatisering.

Lär dig hur text kan representeras med siffror genom vektorrumsmodeller. Få praktisk erfarenhet genom att implementera och anpassa två populära vektorrumsmodeller: bag of words och TF-IDF.

Få en gedigen förståelse för ordembeddingar och hur de fångar semantisk betydelse. Utforska CBoW- och Skip-gram-arkitekturer som används i Word2Vec, samt implementera dem själv.

Utmaning: Ordklassmärkning

Lösning

Utmaning: Ordklassmärkning

Lösning