Learn to rank portfolio

Hello, could be posssible learn to rank examples with deepdow?

https://www.sciencedirect.com/science/article/abs/pii/S0925231217311098
https://www.researchgate.net/publication/315493458_Stock_portfolio_selection_using_learning-to-rank_algorithms_with_news_sentiment

https://arxiv.org/abs/2012.07149

https://ieeexplore.ieee.org/abstract/document/7519089

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0241573

Start by reviewing the linked learning-to-rank papers and the repository's existing examples to determine the intended portfolio-learning workflow. Clarify which paper or method should be demonstrated, what data and evaluation are expected, and consider the work complete when a reproducible deepdow example and its expected results are documented.

Written by the indexing model from the issue text.