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Add nessai sampler

Michael Williams requested to merge michael.williams/bilby:add-nessai-sampler into master

This adds an interface for the nested sampler nessai into bilby.

nessai includes specific functionality for sampling CBC signals as described in https://arxiv.org/abs/2102.11056, for which this interface was initially written.

Example

There is an example of how to use nessai with bilby in the sampler repo here which has been my main way of quickly test things.

GW example

There is also an example of using the GW-specific proposal method included in GWFlowProposal here.

I also intend to add a GW example for the complete space in the near future.

To-Do

The following items need resolving before this can be merged:

  • Resolve issues with tests failing

I'm currently unsure what is causing the tests to fail, the errors don't seem to be related to changes I've made. Any input would be much appreciated.

There may be other issues that I am unaware of, so do let me know.

Edited by Michael Williams

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