jsvetter

Score-based density estimators for SBI

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## What does this implement/fix? Explain your changes This PR implements score-based methods for SBI (and related methods like flow matching). The first goal is to have a running version...

Add NPE-PFN

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## 🚀 Feature Request ### Add NPE-PFN to the library (in the same way as autogluon) [NPE-PFN](https://arxiv.org/abs/2504.17660) is easy-to-use and has strong performance, particularly for small simulation budgets. But currently...