  We propose a novel learning based algorithm to generate efficient and
physically plausible sampling patterns in MRI. This method has a few advantages
compared to recent learning based approaches: i) it works off-the-grid and ii)
allows to handle arbitrary physical constraints. These two features allow for
much more versatility in the sampling patterns that can take advantage of all
the degrees of freedom offered by an MRI scanner. The method consists in a high
dimensional optimization of a cost function defined implicitly by an algorithm.
We propose various numerical tools to address this numerical challenge.
