Add missing DOI references

paper.bib

@@ -3,13 +3,15 @@ @inproceedings{pyannote.audio
   author = {{Bredin}, Herv{\'e} and {Yin}, Ruiqing and {Coria}, Juan Manuel and {Gelly}, Gregory and {Korshunov}, Pavel and {Lavechin}, Marvin and {Fustes}, Diego and {Titeux}, Hadrien and {Bouaziz}, Wassim and {Gill}, Marie-Philippe},
   booktitle = {ICASSP 2020, IEEE International Conference on Acoustics, Speech, and Signal Processing},
   year = {2020},
+  doi = {10.1109/ICASSP40776.2020.9052974},
 }
 
 @inproceedings{optuna,
   title = {{Optuna: A Next-generation Hyperparameter Optimization Framework}},
   author = {Akiba, Takuya and Sano, Shotaro and Yanase, Toshihiko and Ohta, Takeru and Koyama, Masanori},
   booktitle = {Proceedings of the 25rd {ACM} {SIGKDD} International Conference on Knowledge Discovery and Data Mining},
-  year = {2019}
+  year = {2019},
+  doi = {10.1145/3292500.3330701},
 }
 
 @inproceedings{Coria:2021,
@@ -26,5 +28,6 @@ @inproceedings{Ego4D:2022
   author={Grauman, Kristen and Westbury, Andrew and Byrne, Eugene and Chavis, Zachary and Furnari, Antonino and Girdhar, Rohit and Hamburger, Jackson and Jiang, Hao and Liu, Miao and Liu, Xingyu and others},
   booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
   pages={18995--19012},
-  year={2022}
+  year={2022},
+  doi={10.1109/CVPR52688.2022.01842},
 }