Cobaya: NaN Rminus1_cl_level

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Agne Semenaite
Posts: 6
Joined: June 08 2020
Affiliation: Max Planck Institute for Extraterrestrial Physics

Cobaya: NaN Rminus1_cl_level

Post by Agne Semenaite » July 01 2020

I am running cobaya with mcmc sampler with des shear likelihood and all default settings, as provided by the cosmo-generator. However, when I open the progress file I see that the Rminus1_cl_level is NaN throughout. I have also tried running des shear with planck and get the same result.

As a result, my chains never converge, however, everything else seems ok. I get reasonable Rminus1 on means, I can see no NaN values in the chains, no error messages in the terminal output, the inferred parameter values and contours provided by getdist also look reasonable.

I am not even sure how to begin to troubleshoot this - perhaps someone has had a similar experience? Thanks!

Antony Lewis
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Joined: September 23 2004
Affiliation: University of Sussex
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Re: Cobaya: NaN Rminus1_cl_level

Post by Antony Lewis » July 01 2020

Perhaps it just hasn't reached the point in convergence where the R-1 tolerance in the means is reached and it starts to also check the R-1 for the convergence of the confidence limits?

Agne Semenaite
Posts: 6
Joined: June 08 2020
Affiliation: Max Planck Institute for Extraterrestrial Physics

Re: Cobaya: NaN Rminus1_cl_level

Post by Agne Semenaite » July 01 2020

Oh right - I had not realised the first time the r-1 on confidence limtis is calculated was after the means tolerance is reached - thanks so much! I will try to look into why the chains are running for so long with the default parameters instead.

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