Batch fixes

[segasai]

get rid of dlog_batch internal variable put in the dlogz=0.01 function parameter (currently not available from the outside yet) Also prevent spurious warnings in the case we are sampling the 'top' part of the posterior. In that case I set the upper logl limit to be +inf. And if that's the case I'm not checking that logl is above loglmax. addresses #325

[coveralls]

Pull Request Test Coverage Report for Build 1206199408

• 55 of 58 (94.83%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.2%) to 81.783%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
py/dynesty/utils.py	1	2	50.0%
py/dynesty/sampler.py	13	15	86.67%
<!--	Total:	55	58	94.83%	-->

Files with Coverage Reduction	New Missed Lines	%
py/dynesty/utils.py	1	85.74%
<!--	Total:	1		-->

Totals
Change from base Build 1188386185:	0.2%
Covered Lines:	3394
Relevant Lines:	4150

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💛 - Coveralls

[segasai]

I have also tentatively replaced the saved_run in the internal sampler to be truncated saved_run from the parent one which is I think the correct thing to do.

[segasai]

And finally I now coded the newly created sampler for sample_batch. There is still some amount of hacks needed, filling saved_run and setting up bounds, but I think it's still clearer and more explicit. and the outputs during the run should be more sensible, I'd believe. Without that change I just didn't feel I was confident enough in correctness of the code.

[joshspeagle]

Great! Let me know when I should take a look at merging this in.

[segasai]

I think it is ready and the 100 tests worked fine too. It is possible that I missed something that the tests don't cover, but that is always a possibility

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Great! Let me know when I should take a look at merging this in.

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[segasai]

Now out of 100 runs x70 tests there is only one failure 1 FAILED tests/test_dyn.py::test_dyn Which I can't easily fix without just bumping the threshold. I'll probably keep it as it is. I hope that concludes everything that needed fixing before 1.2