
Free annotation software for images, text, audio, video and time series
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1 / 7Label Studio is an open-source data labeling tool from HumanSignal for annotating the data that machine learning models learn from. It handles images, text, audio, video and time series, offers ML-assisted pre-labeling, lets teams design interfaces in XML and supports multi-user review. A REST API connects it to pipelines. Common uses include computer vision, NLP, speech and LLM fine-tuning, including RLHF. It suits ML teams that want a flexible, free annotation tool.
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