Merge pull request #74 from yuxinc17/s2p2

Add link and notebook for the S2P2 model.

Author: iLampard

README.md

@@ -77,7 +77,7 @@ We provide reference implementations of various state-of-the-art TPP papers:
 |  6  |   ICLR'20   | IntensityFree | [Intensity-Free Learning of Temporal Point Processes](https://arxiv.org/abs/1909.12127)                                                  | [PyTorch](easy_tpp/model/torch_model/torch_intensity_free.py)                                                              |
 |  7  |   ICLR'21   |    ODETPP     | [Neural Spatio-Temporal Point Processes (simplified)](https://arxiv.org/abs/2011.04583)                                                  | [PyTorch](easy_tpp/model/torch_model/torch_ode_tpp.py)                                                                     |
 |  8  |   ICLR'22   |    AttNHP     | [Transformer Embeddings of Irregularly Spaced Events and Their Participants](https://arxiv.org/abs/2201.00044)                           | [PyTorch](easy_tpp/model/torch_model/torch_attnhp.py)                                                                     |
-|  9  |   NeurIPS'25   |    S2P2     | Deep Continuous-Time State-Space Models for Marked Event Sequences   | [PyTorch](easy_tpp/model/torch_model/torch_s2p2.py)                                                                     |
+|  9  |   NeurIPS'25   |    S2P2     | [Deep Continuous-Time State-Space Models for Marked Event Sequences](https://openreview.net/pdf?id=74SvE2GZwW)   | [PyTorch](easy_tpp/model/torch_model/torch_s2p2.py)                                                                     |