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LASER is an open-source library from Facebook AI Research for computing and using multilingual sentence embeddings. It provides language-agnostic models (LASER-2 and LASER-3) and a pip-installable laser_encoders package to enable cross-lingual representation and multilingual similarity tasks. The project includes extensions like xSIM and P-xSIM for multilingual similarity search, and is distributed under the BSD license.
AI named LASER in December 2025.