import unittest
import re
import nltk
from sklearn.feature_extraction.text import TfidfVectorizer
import pandas as pd
from scipy.sparse import csr_matrix


# 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, "pd"), 
            "`pd` is not declared"
        )
        _require_success(
            self,
            user_code.pd == pd,
            "`pd` is declared, but it's not `pandas` library"
        )
        _require_success(
            self, 
            hasattr(user_code, "TfidfVectorizer"), 
            "`TfidfVectorizer` is not declared"
        )
        _require_success(
            self,
            user_code.TfidfVectorizer == TfidfVectorizer,
            "`TfidfVectorizer` is declared, but it's not `sklearn.feature_extraction.text.TfidfVectorizer`"
        )
        self._testMethodName = "imports are correct"

    # Test original corpus
    def test_corpus(self):
        import user_code
        expected = pd.read_csv(
    'https://content-media-cdn.codefinity.com/courses/c68c1f2e-2c90-4d5d-8db9-1e97ca89d15e/section_3/chapter_4/example_corpus.csv')
        _require_success(
            self, 
            hasattr(user_code, "corpus"), 
            "`corpus` is not declared"
        )
        _check_success(
            self,
            expected.equals(user_code.corpus),
            "`corpus` contains correct value",
            "`corpus` shouldn't be modified"
        )

    # Test that tfidf_vectorizer is declared correctly
    def test_tfidf_vectorizer(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "tfidf_vectorizer"), 
            "`tfidf_vectorizer` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.tfidf_vectorizer, TfidfVectorizer), 
            "`tfidf_vectorizer` is not an instance of `TfidfVectorizer`"
        )
        _require_success(
            self, 
            user_code.tfidf_vectorizer.ngram_range == (1, 3), 
            "`tfidf_vectorizer` should work with and only with unigrams, bigrams, and trigrams"
        )
        self._testMethodName = "`tfidf_vectorizer` is defined correctly"

    # Test tfidf_matrix computation
    def test_tfidf_matrix(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "corpus"), 
            "`corpus` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.corpus, pd.DataFrame), 
            "`corpus` is not a DataFrame"
        )
        _require_success(
            self, 
            "Document" in user_code.corpus.columns, 
            "`corpus` doesn't contain `'Document'` column"
        )
        _require_success(
            self, 
            hasattr(user_code, "tfidf_matrix"), 
            "`tfidf_matrix` is not declared"
        )
        tfidf_vectorizer = TfidfVectorizer(ngram_range=(1, 3))
        tfidf_matrix = tfidf_vectorizer.fit_transform(user_code.corpus['Document'])
        _check_success(
            self,
            user_code.tfidf_matrix.shape == tfidf_matrix.shape and (user_code.tfidf_matrix - tfidf_matrix).nnz == 0,
            "`tfidf_matrix` is computed correctly",
            "`tfidf_matrix` is not computed correctly"
        )

    # Test tfidf_matrix_df conversion
    def test_tfidf_matrix_df(self):
        import user_code
        _require_success(
            self, 
            hasattr(user_code, "tfidf_vectorizer"), 
            "`tfidf_vectorizer` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.tfidf_vectorizer, TfidfVectorizer), 
            "`tfidf_vectorizer` is not an instance of `TfidfVectorizer`"
        )
        _require_success(
            self, 
            hasattr(user_code, "tfidf_matrix"), 
            "`tfidf_matrix` is not declared"
        )
        _require_success(
            self, 
            isinstance(user_code.tfidf_matrix, csr_matrix), 
            "`tfidf_matrix` is not a `csr_matrix`"
        )
        _require_success(
            self, 
            hasattr(user_code, "tfidf_matrix_df"), 
            "`tfidf_matrix_df` is not declared"
        )
        tfidf_matrix_df = pd.DataFrame(user_code.tfidf_matrix.toarray(), columns=user_code.tfidf_vectorizer.get_feature_names_out())
        _check_success(
            self,
            tfidf_matrix_df.equals(user_code.tfidf_matrix_df),
            "`tfidf_matrix_df` is computed correctly",
            "`tfidf_matrix_df` is not computed correctly"
        )

    # Test print statement
    def test_print(self):
        with open("user_code.py", "r") as f:
            user_code_text = f.read()
        _check_success(
            self,
            re.search(r"print *\( *tfidf_matrix_df *\[ *(?P<quote>[\\"'])medical(?P=quote) *\] *\. *values *\)", user_code_text),
            "print statement is correct",
            "print statement is not correct"
        )


if __name__ == '__main__':
    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. Få 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: TF-IDF

Lösning

Awesome!

Utmaning: TF-IDF

Lösning