I have a dataset of sentences in a non english language like :

  1. word1 word2 word3 word62

  2. word5 word1 word2

Now i want to turn each variable length sentence to a fixed size vector to give it to my model, and i want all the words in the sentences to have effect on the output

I thought maybe i can use an algorithm like word2vec and turn each word into a fixed size vector, and add all of them to represent the sentence, is this a meaningful approach? is this better than adding the hot one vectors of the words to represent the sentence? is there a better approach than these two?

EDIT1: basically i have a dataset of random variable length sentences and i want to embed them the best way possible, meaning keeping as much information as possible in the resulting embedded vectors (which all have the same size)


1 Answer 1


So the question asks how to represent a series of words a uniform vector representation, which is not dependent on sequence.

The idea you suggested is definitely not a bad idea, you should try that out.

You should also try Doc2Vec, which works on the same principle as Word2Vec but this time it will output a vector which represents the meaning of a section of text that is longer than 1 word.

The main problem with this sort of representation is that you lose sequential information of the text and you treat words in sentences as a “bag of words”. If you happy to make that assumption, then continue using your approach of Doc2Vec.

Otherwise, you might better off using a sequential model architecture, such as RNN/LSTM, etc. Here you can input each word at a given time step initially as a one hot encoded vector and then you add an embedding layer before it goes into the sequential model to transform the one hot encoding into a word embedding.

  • $\begingroup$ So in the RNN approach, what is the output of the RNN? is there any blogpost that teaches this? because i didn't know we can use RNNs to embed sentences, since we don't know the correct output and its semi supervised learning $\endgroup$
    – OneAndOnly
    Aug 19, 2020 at 7:36
  • $\begingroup$ Right ok, thank you for adding further context to the problem. Could you edit your original post to include what it is exactly you are wanting to achieve and then I can tailor my response accordingly. $\endgroup$
    – shepan6
    Aug 19, 2020 at 10:44
  • $\begingroup$ @shepano6 i edited the question $\endgroup$
    – OneAndOnly
    Aug 19, 2020 at 15:48
  • $\begingroup$ Thank you for your edit, but I still don’t have an idea of how this relates to the bigger problem you are solving. Ie could you give more details on this semi supervised classification task? $\endgroup$
    – shepan6
    Aug 19, 2020 at 21:37
  • $\begingroup$ I want to give these resulting vectors to my model to do a binary classification of the sentences $\endgroup$
    – OneAndOnly
    Aug 20, 2020 at 5:13

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