How to use tf idf vectorizer

This recipe helps you use tf idf vectorizer

Recipe Objective

How to use tf-idf vectorizer? tf-idf vectorizer As we have discussed earlier only TF-IDF stands for term frequency and inverse document frequency. It is used to tokenize the documents learn the vocabulary and inverse the document frequency weightings, and allow to encode new documents.

for e.g A vocabulary of 8 words is learned from the given documents and each word is assigned a unique integer index in the output vector.

TF-IDF will transform the text into meaningful representation of integers or numbers which is used to fit machine learning algorithm for predictions.

TF-IDF Vectorizer is a measure of originality of a word by comparing the number of times a word appears in document with the number of documents the word appears in. formula for TF-IDF is:

TF-IDF = TF(t, d) x IDF(t), where, TF(t, d) = Number of times term "t" appears in a document "d". IDF(t) = Inverse document frequency of the term t.

The TfidfVectorizer converts a collection of raw documents into a matrix of TF-IDF features.

FastText and Word2Vec Word Embeddings Python Implementation

Step 1 - Import necessary libraries

import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer

Step 2 - Take Sample Data

data1 = "I'm designing a document and don't want to get bogged down in what the text actually says" data2 = "I'm creating a template with various paragraph styles and need to see what they will look like." data3 = "I'm trying to learn more about some feature of Microsoft Word and don't want to practice on a real document."

Step 3 - Convert Sample Data into DataFrame using pandas

df1 = pd.DataFrame({'First_Para': [data1], 'Second_Para': [data2], 'Third_Para': [data2]})

Step 4 - Initialize the Vectorizer

tfidf_vectorizer = TfidfVectorizer() doc_vec = tfidf_vectorizer.fit_transform(df1.iloc[0])

Here we have initialized the vectorizer and fit & transformed the data

Step 5 - Convert the transformed Data into a DataFrame.

df2 = pd.DataFrame(doc_vec.toarray().transpose(), index=tfidf_vectorizer.get_feature_names())

Step 6 - Change the Column names and print the result

df2.columns = df1.columns print(df2)

           First_Para  Second_Para  Third_Para
actually     0.276856     0.000000    0.000000
and          0.163515     0.208981    0.208981
bogged       0.276856     0.000000    0.000000
creating     0.000000     0.269101    0.269101
designing    0.276856     0.000000    0.000000
document     0.276856     0.000000    0.000000
don          0.276856     0.000000    0.000000
down         0.276856     0.000000    0.000000
get          0.276856     0.000000    0.000000
in           0.276856     0.000000    0.000000
like         0.000000     0.269101    0.269101
look         0.000000     0.269101    0.269101
need         0.000000     0.269101    0.269101
paragraph    0.000000     0.269101    0.269101
says         0.276856     0.000000    0.000000
see          0.000000     0.269101    0.269101
styles       0.000000     0.269101    0.269101
template     0.000000     0.269101    0.269101
text         0.276856     0.000000    0.000000
the          0.276856     0.000000    0.000000
they         0.000000     0.269101    0.269101
to           0.163515     0.208981    0.208981
various      0.000000     0.269101    0.269101
want         0.276856     0.000000    0.000000
what         0.163515     0.208981    0.208981
will         0.000000     0.269101    0.269101
with         0.000000     0.269101    0.269101

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