What is a skip gram model and when to use it?
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What is a skip gram model and when to use it?

What is a skip gram model and when to use it?

This recipe explains what is a skip gram model and when to use it

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Recipe Objective

What is a skip gram model and when to use it? As we have discussed earlier only about Word2vec and Skip Gram comes under Word2Vec. Skip Gram which predicts the the surrounding context words within specific window given current word. The input layer contains the current word and the output layer contains the context words. The hidden layer contains the number of dimensions in which we want to represent current word present at the input layer.

Step 1 - Import the necessary libraries

from nltk.tokenize import sent_tokenize, word_tokenize import warnings warnings.filterwarnings(action = 'ignore') import gensim from gensim.models import Word2Vec

Here we have imported the necessary packages along with the warnings and kept it as ignore because we know that there might be some warnings comming up when we run our program, but that can be ignored.

Step 2 - load the sample data

sample = open("/content/alice_in_wonderland.txt", "r") s = sample.read()

Step 3 - Replace the escape character with spaces

f = s.replace("\n", " ")

Step 4 - Iterate and tokenize

import nltk nltk.download('punkt') data = [] for i in sent_tokenize(f): temp = [] for j in word_tokenize(i): temp.append(j.lower()) data.append(temp)

Here we are taking a list as variable named data which is initially empty, after that we are going take a for loop which will iterate through each sentences present in the text file, and the second for loop will tokenize the sentences into words.

Step 5 - Create a Skip Gram model

model2 = gensim.models.Word2Vec(data, min_count = 1, size = 100, window = 5, sg = 1)

Step 6 - Print the result of Skip Gram model

print("Cosine similarity between 'alice' " + "and 'wonderland' - Skip Gram : ", model2.similarity('alice', 'wonderland')) print("Cosine similarity between 'alice' " + "and 'machines' - Skip Gram : ", model2.similarity('alice', 'machines'))
Cosine similarity between 'alice' and 'wonderland' - Skip Gram :  0.9486537
Cosine similarity between 'alice' and 'machines' - Skip Gram :  0.94141114

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