Doc2Vec — Document Embeddings
Also known as: paragraph vector, document embeddings, Doc2Vec Belge Gömülmeleri
Doc2Vec, also known as Paragraph Vector, is a representation-learning method introduced by Le and Mikolov (2014) that maps whole documents to fixed-length dense vectors. These vectors place similar documents close together in space, supporting document comparison and classification.
Key highlights
- Produces a single fixed-length dense vector for an entire document, regardless of its original length.
- Embeddings place similar documents near each other, enabling direct comparison and similarity search.
- The resulting vectors feed naturally into classification and relationship analysis.
Intuition
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How it works
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When to use it
Doc2Vec fits when you have a text corpus and want a single dense vector per document for comparison, classification, or relationship analysis. It assumes a sufficient number and length of documents — roughly 100 documents or more — and that text preprocessing has been done. With too few or very short documents the learned vectors are unreliable.
Strengths & limitations
- Produces a single fixed-length dense vector for an entire document, regardless of its original length.
- Embeddings place similar documents near each other, enabling direct comparison and similarity search.
- The resulting vectors feed naturally into classification and relationship analysis.
- Needs a sufficient number and length of documents to learn stable vectors; small corpora give unreliable embeddings.
- Requires proper text preprocessing before training.
- Performance depends on training choices such as vector size and the number of epochs.
Common pitfalls
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Applications
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Frequently asked
How is Doc2Vec different from word embeddings?
Word-embedding methods learn a vector for each word. Doc2Vec learns an additional vector for each whole document, so you get one fixed-length representation per document rather than having to combine word vectors yourself.
How many documents do I need?
The method assumes a sufficient number and length of documents — roughly 100 or more. With far fewer documents, or very short ones, the learned vectors become unreliable.
Do I need to preprocess the text first?
Yes. The corpus should be cleaned and tokenised consistently before training, otherwise the learned document vectors are hard to compare.
What can I do with the resulting vectors?
Each document becomes a fixed-length dense vector you can compare by distance or similarity, or use directly as input features for classification and relationship analysis.
Sources
- 1.Le, Q. V. & Mikolov, T. (2014). Distributed Representations of Sentences and Documents. Proceedings of the 31st International Conference on Machine Learning (ICML), 1188-1196.
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Cite this page
ScholarGate. (2026, June 1). Doc2Vec. ScholarGate. https://scholargate.app/text-mining/doc2vec