$\begingroup$ @zachdji thanks for the information .Can you share the syntax for mean pool and max pool i tired torch.mean(hidden_reps[0],1) but when i tried to find cosin similarity for 2 different sentences it gave me high score .So not sure whether im doing the right way to get the sentence embedding . A great example of this is the recent announcement of how the BERT model is now a major force behind Google Search. To add to @jindřich answer, BERT is meant to find missing words in a sentence and predict next sentence. BERT consists of two pre training steps Masked Language Modelling (MLM) and Next Sentence Prediction (NSP). IJCNLP 2019 • UKPLab/sentence-transformers • However, it requires that both sentences are fed into the network, which causes a massive computational overhead: Finding the most similar pair in a collection of 10, 000 sentences requires about 50 million inference computations (~65 hours) with BERT. To answer your question, implementing it yourself from zero would be quite hard as BERT is not a trivial NN, but with this solution you can just plug it in into your algo that uses sentence similarity. These embeddings are much more meaningful as compared to the one obtained from bert-as-service, as they have been fine-tuned such that semantically similar sentences have higher similarity score. bert-as-service offers just that solution. Word embedding based doc2vec is still a good way to measure similarity between docs . Translations: Chinese, Russian Progress has been rapidly accelerating in machine learning models that process language over the last couple of years. and are tuned specificially meaningul sentence embeddings such that sentences with similar meanings are close in vector space. GitHub statistics: Stars: Forks: ... networks like BERT / RoBERTa / XLM-RoBERTa etc. I am using the HuggingFace Transformers package to access pretrained models. You should consider Universal Sentence Encoder or InferSent therefore. If you still want to use BERT, you have to either fine-tune it or build your own classification layers on top of it. This progress has left the research lab and started powering some of the leading digital products. BERT uses transformer architecture, an attention model to learn embeddings for words. Semantic Textual Similarity; Edit on GitHub; Semantic Textual Similarity¶ Once you have sentence embeddings computed, you usually want to compare them to each other. In BERT training text is represented using three embeddings, Token Embeddings + Segment Embeddings + Position Embeddings. As my use case needs functionality for both English and Arabic, I am using the bert-base-multilingual-cased pretrained model. Jacob Devlin (one of the authors of the BERT paper) wrote: I'm not sure what these vectors are, since BERT does not generate meaningful sentence vectors. 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