According to the Open Source Initiative:
Open Weights differ significantly from Open Source AI because they do not include:
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Training code – The scripts or frameworks used to create and curate the training dataset.
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Training dataset – The full dataset used for training, when legally possible. As an alternative, when distribution of the training dataset is not legally possible,
- Comprehensive data transparency – Full details about dataset composition, such as source domains, cleaning methods, or balancing techniques.