Visualization and Clustering in Python

Question

I would like to classify comments based on NLP algorithm (tf-idf). I managed to classify these clusters but I want to visualize them graphically (histogram, scatter plot...)

import collections
from nltk import word_tokenize
from nltk.corpus import stopwords
from nltk.stem import PorterStemmer
from sklearn.cluster import KMeans
from sklearn.feature_extraction.text import TfidfVectorizer
from pprint import pprint
import matplotlib.pyplot as plt
import pandas as pd
import nltk
import pandas as pd
import string
data = pd.read_excel (r'C:\Users\cra\One\intern\Book2.xlsx') 
def word_tokenizer(text):
        #tokenizes and stems the text
        tokens = word_tokenize(text)  
        stemmer = PorterStemmer() 
        tokens = [stemmer.stem(t) for t in tokens if t not in 
        stopwords.words('english')] 
        return tokens 

#tfidf convert text data to vectors 

def cluster_sentences(sentences, nb_of_clusters=5):
        tfidf_vectorizer = TfidfVectorizer(tokenizer=word_tokenizer,

        stop_words=stopwords.words('english'),#enlever stopwords
                                        max_df=0.95,min_df=0.05, 
           lowercase=True) 

        tfidf_matrix = tfidf_vectorizer.fit_transform(sentences) 
        kmeans = KMeans(n_clusters=nb_of_clusters)
        kmeans.fit(tfidf_matrix)
        clusters = collections.defaultdict(list)
        for i, label in enumerate(kmeans.labels_):
                clusters[label].append(i)
        return dict(clusters)
if __name__ == "__main__":
         sentences = data.Comment
        nclusters= 20
        clusters = cluster_sentences(sentences, nclusters) #dictionary of 
        #cluster and the index of the comment in the dataframe
        for cluster in range(nclusters):
                print ("cluster ",cluster,":")
                for i,sentence in enumerate(clusters[cluster]):
                        print ("\tsentence ",i,": ",sentences[sentence])

result that I got for example : cluster 6 : sentence 0 : 26 RIH DP std sentence 1 : 32 RIH DP std sentence 2 : 68 RIH Liner with DP std in hole sentence 3 : 105 RIH DP std sentence 4 : 118 RIH std no of DP in hole sentence 5 : 154 RIH DP std

Could you help me please! thank you

Adnan S · Accepted Answer · 2019-08-20 00:01:57Z

1

You will need to use t-SNE to visualize the clusters - this article on visualizing and clustering US Laws using tf-idf can get you started.

answered Aug 20, 2019 at 0:01

Adnan S

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