Great series on Recys Gaurav! Thanks for writing it :)
Just nitpicking a little, I think the NDCG cannot be optimized directly as it is a non-differentiable metric. To overcome this, some modified form of NDCG should be used. Google proposed ApproxNDCCG here:
Gaurav, this is such an amazing series on RecSys!!
Thanks!
Great series on Recys Gaurav! Thanks for writing it :)
Just nitpicking a little, I think the NDCG cannot be optimized directly as it is a non-differentiable metric. To overcome this, some modified form of NDCG should be used. Google proposed ApproxNDCCG here:
https://dl.acm.org/doi/pdf/10.1145/3331184.3331347