I had this question via Discord.
Did you use Merlin extensively for your winning solution?
Yes, I used Merlin for deep learning models, in particular the Transformer based deep learning models. I used Transformers4Rec ( GitHub - NVIDIA-Merlin/Transformers4Rec: Transformers4Rec is a flexible and efficient library for sequential and session-based recommendation and works with PyTorch. ) to train a sequential model to predict the next item given the input sequence. I trained ~4 different transformer-based models. The models improved significantly my candidate generation process.
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