Changes the default number of walks to 30x ndim (previously 10x ndims).

The default settings are insufficient for the pp-tests of the high-spin 128s basis to pass (#388 (closed)). This changes fixes that. The downside of this is it is setting out default settings by CBC inference. So people doing "easier" problems will need to tone down the settings.

changed milestone to %0.5.4

added Sampling label

Something I hadn't appreciated in #388 (closed) is that the default settings are in fact not a fixed number of walks, but a multiplicative factor of the number of dimensions. The current default is 10xndim. Here I show the PP test for the 20x and 30x the number of dimensions. The sampling time is correspondingly increased, but it improves the robustness of the result.

	PP plot	Meta data
1000nlive 20xndim
1000nlive 30xndim

Given the improvement in the pp test, I'm going to advocate we increase the defaults to 30*nwalks. I'm not experimenting increasing the dlogz in order to recoup some of the run time.

Okay, so running with dlogz=0.5 we have

	PP plot	Meta data
1000nlive 30xndim dlogZ=0.5

This passes the test, but still looks slightly ratty. However, this doesn't combine multiple runs so in practise I expect things to be cleaned up quite substantially on real runs.

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• b55f9c56 - Fix tests and increase dlogz

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unmarked as a Work In Progress

changed the description

Since changing the dlogz didn't really improve the sampling times, but did make it a little my ratty, I'm going to revert that change.

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• c3141c17 - Revert the change to dlogz

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• 9312d967 - Update changelog

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changed title from Change the default settings to Changes the default number of walks to 30x ndim (previously 10x ndims).

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approved this merge request

approved this merge request

merged

mentioned in commit e3319cd3

mentioned in issue #388 (closed)