Find most similar sentence in the file to the input sentence | NLP

Last Updated : 26 Nov, 2020

In this article, we will find the most similar sentence in the file to the input sentence.

Example:

File content:
"This is movie."
"This is romantic movie"
"This is a girl."

Input: "This is a boy"

Similar sentence to input: 
"This is a girl", "This is movie".

Approach:

Create a list to store all the unique words of the file.
Convert all the sentences of the file into the binary format by comparing each word with the content of the list, after cleaning(removing stopword, stemming, etc.)
Convert the input sentence in the binary format.
Find the number of similar words in the input sentence to each sentence and store the value in the list named similarity index.
Find the maximum value of similarity index and return the sentence having maximum similar words.

Content of the file:

Code to get a similar sentence:

Python3

from nltk.stem import PorterStemmer
from nltk.tokenize import word_tokenize, sent_tokenize
import nltk
from nltk.corpus import stopwords
  
  
nltk.download('stopwords')
ps = PorterStemmer()
f = open('romyyy.txt')
a = sent_tokenize(f.read())
  
# removal of stopwords
stop_words = list(stopwords.words('english'))
  
# removal of punctuation signs
punc = '''!()-[]{};:'"\, <>./?@#$%^&*_~'''
s = [(word_tokenize(a[i])) for i in range(len(a))]
outer_1 = []
  
for i in range(len(s)):
    inner_1 = []
      
    for j in range(len(s[i])):
          
        if s[i][j] not in (punc or stop_words):
            s[i][j] = ps.stem(s[i][j])
              
            if s[i][j] not in stop_words:
                inner_1.append(s[i][j].lower())
      
    outer_1.append(set(inner_1))
rvector = outer_1[0]
  
for i in range(1, len(s)):
    rvector = rvector.union(outer_1[i])
outer = []
  
for i in range(len(outer_1)):
    inner = []
      
    for w in rvector:
          
        if w in outer_1[i]:
            inner.append(1)
          
        else:
            inner.append(0)
    outer.append(inner)
comparison = input("Input: ")
  
  
check = (word_tokenize(comparison))
check = [ps.stem(check[i]).lower() for i in range(len(check))]
  
  
check1 = []
for w in rvector:
    if w in check:
        check1.append(1)  # create a vector
    else:
        check1.append(0)
  
ds = []
  
for j in range(len(outer)):
    similarity_index = 0
    c = 0
      
    if check1 == outer[j]:
        ds.append(0)
    else:
        for i in range(len(rvector)):
  
            c += check1[i]*outer[j][i]
  
        similarity_index += c
        ds.append(similarity_index)
  
  
ds
maximum = max(ds)
print()
print()
print("Similar sentences: ")
for i in range(len(ds)):
  
    if ds[i] == maximum:
        print(a[i])

Output:

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