Adding an ACT estimate for the walks

• Improvements to the bilby implemented rwalk method

  • rwalk a new implementation which calculates an ACT to better estimate the number of steps needed

• The rwalk sample method now defaults to bilby.core.sample.dynesty.sample_rwalk_bilby_with_act which adds the maxmcmc, nact. These control the maximum number of walks, the number of ACT required before accepting a point.

• Uses the CPNest method to calculate the ACT

• Adds a guide to the documentation on using dynesty

• Updates the default vol_dec to 8 and enlarge to 1.5 which was found to improve boundary behaviour Note: during development, I experimented with adding a Jacobian and adaptive walks. I found in practise these didn't help sampling so I've removed them for simplicity.

• Updates the walks to default to 100. This is now the minimum number of steps.

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• 7a9761fa - Minor tweaks

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• a7843031 - More tweaks

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• 869c6807 - Trial method for adjusting the scale

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• 94f53cc8 - More minor tweaks

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• 4063eddd - More changes

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• b8a7559c - Minor tweak
• 7b975af2 - Add separate updating method
• 6b49ae94 - Add Jacobian
• 03b50bdc - Remove adaptive method
• ad0497d0 - Update docs
• 0f955a4d - Improve message
• 9bce9c76 - Add emcee to the requirements
• 12876207 - Minor tweaks

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changed milestone to %0.6.0

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• 08e03c4f - Fix flake8

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• 69c99264 - Remove Jacobian
• 3c187ce1 - Fix test

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• 3babc722 - Only print warning once and only break of accept > 0

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• 4aeb56f7 - Flatten the walking loop to avoid bias and add the rstagger method
• 84676190 - Merge branch 'add-act-estimated-walks' of git.ligo.org:Monash/tupak into add-act-estimated-walks

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• 73c02614 - Set nact to default to 5

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• be296bdf - Fix tests

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