手法を比較

	多言語Doc2Vec	文埋め込み（Sentence Embeddings）
分野	深層学習	深層学習
系統	Machine learning	Machine learning
提唱年	2014–2016	2015–2019
提唱者	Le, Q. & Mikolov, T. (Doc2Vec); multilingual extension by community	Kiros et al. (Skip-Thought, 2015); Reimers & Gurevych (Sentence-BERT, 2019)
種類	Distributed document embedding (unsupervised / self-supervised)	Representation learning / embedding
原典	Le, Q., & Mikolov, T. (2014). Distributed representations of sentences and documents. In Proceedings of the 31st International Conference on Machine Learning (ICML), PMLR 32(2), 1188–1196.	Reimers, N., & Gurevych, I. (2019). Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks. Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing (EMNLP), 3980–3990.
別名	multilingual paragraph vector, cross-lingual Doc2Vec, multilingual PV-DM, multilingual PV-DBOW	sentence vectors, sentence representations, SBERT, semantic sentence encoding
関連	4	4
概要	Multilingual Doc2Vec extends the Paragraph Vector framework of Le and Mikolov (2014) to two or more languages, training document-level embeddings in a shared or aligned vector space so that semantically similar documents — regardless of their language — end up close together. It enables cross-lingual document retrieval, classification, and clustering without requiring parallel corpora or translation.	Sentence Embeddings convert a sentence or short text into a single fixed-length dense vector that captures its semantic meaning. These vectors allow downstream tasks — semantic similarity, clustering, retrieval, and classification — to operate on numerical representations instead of raw text, making them one of the most versatile building blocks in modern NLP pipelines.