Sample exact model-X knockoffs using tools from the Markov chain Monte Carlo and graphical models literature. R and Python code can be found here and tutorials/notebooks can be found here.
Use the Hilbert space-filling curve to stratify the sample space and allow the sequential Monte Carlo (SMC) to explore the sample space more efficiently compared to the standard i.i.d. multiple-descendant sampling-resampling approach. Python code can be found here and tutorials/notebooks can be found here.