This is a cross-encoder model with dot-product based scoring mechanism trained on MS-MARCO dataset. The parameters of the cross-encoder are initialized using a 6-layer minilm model and is trained via distillation using scores from three different teacher models. This model is used in experiments of our EMNLP 2023 and ICLR 2024 papers.
See our EMNLP 2022 paper titled "Efficient Nearest Neighbor Search for Cross-Encoder Models using Matrix Factorization" for more details on the dot-product based scoring mechanism.