Swap decay factor

[Richard-Sti]

Adding a (customisable) decay factor into the swap acceptance ratio, along with an option to turn off higher temperature chains.

[pep8speaks]

Hello @Richard-Sti! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file epsie/chain/ptchain.py:

Line 583:80: E501 line too long (80 > 79 characters)
Line 706:1: E302 expected 2 blank lines, found 1
Line 793:30: E225 missing whitespace around operator
Line 796:5: E303 too many blank lines (2)
Line 798:56: W605 invalid escape sequence '\l'
Line 814:9: E265 block comment should start with '# '

• In the file epsie/samplers/ptsampler.py:

Line 75:80: E501 line too long (80 > 79 characters)

Comment last updated at 2022-04-22 19:18:20 UTC

[Richard-Sti]

In PTchain when storing the acceptance ratio -- store the penalised acceptance ratios? I think it's better to store the non-penalised acceptances ratios, otherwise it would conflict with the idea of the Vousden et al adaptive temperature annealing.

Otherwise, the PR is still missing a way to actually turn off the higher temperature chains, pytests and possibly rewritten ACL and GR calculations now that the temps do not have the same length.