Is it possible to find valuable papers on machine learning for investing? • r/MachineLearning

There are plenty of papers on the use of machine learning for finance. Most of them end up saying that the results look somehow promising but more work is needed. When I read these papers my thinking is that if it would really work, it will not be published. It will be part of an hedge fund or somebody will be secretly trading and taking the profits. Have you found any solid paper on the use of machine learning for investing? Do you mind sharing it?