CHANGELOG.md

3.0.5 – 2021-YY-ZZ

MCMC

• Overhead reduced by at least 40%, thanks to caching in Collection

Minimize

• PyBOBYQA updated to 1.2, and quieter by default.

3.0.4 – 2021-03-10

General

• Added current-state-related properties to Theory (current_state replacing _current_state attribute, and current_derived replacing get_current_derived() method) and LikelihoodInterface(current_logp replacing get_current_logp).
• Reworked and simplified error propagation for Theory and Likelihood: clearer error messages and more predictable traceback printing.
• @abstract decorator for base classes: better control of which methods of a parent class have been implemented/overridden (useful e.g. for Theory classes inheriting from a more general one but not implementing all possible quantities that the parent class defines).
• For components with defaults, type annotations for class attributes now automatically recognised as possible input options (previously only class attributes definitions).
• Shorter parameter specification now possible: <param_name>: [<prior_min>,<prior_max>,<ref_loc>,<ref_scale>,<proposal_width>], assuming a uniform prior and a normal reference pdf.
• Got up to date with changes in numpy 1.20.
• bugfix: model.add_requirements() does not overwrite previous calls any more.

Cosmology:

• Interfaced sigma8 for arbitrary redshift (PR #144; thanks @Pablo-Lemos)
• Standardised naming conventions of base classes (CamelCasing, no leading underscores, simpler names). Added workarounds and deprecation notices for some of the old names.
• Updated cosmology Model example in docs.
• Added A. Lewis' CMB forecast data generator in CMBlikes definition file.
• Boltzmann: added unlensed Cl's with CAMB and CLASS.
• CMBlikes: small improvements, fixes, and docs.
• InstallableLikelihood now works with no install_options defined (local data).
• bugfix: bad handling of CMB polarisation capitalisation in Boltzmann.
• bugfix: bad if condition when retrieving sigmaR from camb (thanks @gcanasherrera and @matmartinelli)
• bugfix: unnecessary camb recomputations when setting some parameters as extra_args; fixes #142 (thanks @kimmywu)

3.0.3 – 2021-01-16

General

• Bugfixes when using cobaya.sample.get_sampler()
• More informative error tracebacks; fixes #121 (thanks @msyriac)
• Uniform priors can now be specified simply as [<min>, <max>]
• Likelihoods can now be renamed and used mutiple times simultaneously; fixes #126 (thanks @Pablo-Lemos)

Bibliography tools

• Bibtex files can now be specified via a class attribute, making inheritance easier (used to remove duplication)
• Component description now separate from bibtex code; by default, the component class docstring is used as description.
• Descriptions can be overridden to account for component input options (e.g. the actual method used in the minimizer).

Installation scripts

• Several bugs fixed: #123, #127 and others (thanks @timothydmorton, @xgarrido)

Minimize

• MCMC checkpoints are not deleted any more (was preventing resuming); fixes #124 (thanks @misharash)

Cosmological likelihoods and theory codes

BAO

• Added Hubble distance and fix to bao.generic (Thanks @Pablo-Lemos)

H0

• Added Riess 2020 and Freedman et al 2020
• Normalisation changed to chi2; fixes #105 (thanks @jcolinhill)

CAMB

• Fixed wrong sigma8 when z=0 not requested; fixes #128, #130, #132 (thanks @Pablo-Lemos and @msyriac)

CLASS

• Fixed ignoring l_max_scalars (thanks Florian Stadtmann)
• Fixed #106 (thanks @lukashergt)
• Adds min gcc version check for 6.4 (thanks @williamjameshandley)

cosmo-generator

• Fixed PySide2 problem in newer systems; fixes #114 (thanks @talabadi)
• Fixed missing Sampler combo box (thanks @williamjameshandley)

3.0.2 – 2020-10-16

General

• Installation bug fix.

3.0.1 – 2020-10-15

General

• Cobaya can (and should!) now be called as python -m cobaya run instead of cobaya-run, and the same for the rest of the scripts.

Installation scripts

• File downloader function now uses requests instead of wget (less prone to segfaults), and stores intermediate files in a tmp folder.
• Added --skip-global option to cobaya-install: skips local installation of codes when the corresponding python package is available globally.
• path=global available for some components: forces global-scope import, even when installed with cobaya-install.
• Added --skip-not-installed to pytest command, to allow tests of non-installed components to fail.
• Installable components can define a class method is_compatible determining OS compatibility (assumed compatible by default). Installation of OS-incompatible components is skipped.

Minimize

• Results shared with all MPI processes.
• [prefix].updated.yaml is now [prefix].minimize.updated.yaml (GetDist needs to know the original sampler).
• Loads covmat correcly when starting from PolyChord sample.

Collections

• Collections are picklable again.
• Slices with omitted limits, e.g. [::2], now work.
• Slicing now returns a copy of the Collection, instead of a raw pandas.DataFrame.

MCMC

• Better MPI error handling: will now fail gracefully when called inside a user's script (as opposed to cobaya-run).

3.0 – 2020-05-12

General

• Python 2 support removed, now requires Python 3.6+. Uses dict rather than OrderedDict.
• Significant internal refactoring including support for multiple inter-dependent theory codes.
• Greatly reduced Python overhead timing, faster for fast likelihoods.
• New base classes CobayaComponent and ComponentCollection, with support for standalone instantiation of all CobayaComponent.
• .yaml can now reference class names rather than modules, allowing multiple classes in one module.
• .yaml default files are now entirely at the class level, with no kind:module: embedding.
• inheritance of yaml and class attributes (with normal dict update, so e.g. all inherited nuisance parameters can be removed using params:). Each class can either define a .yaml or class attributes, or neither, but not both.
• The .theory member of likelihoods is now Provider class instance.
• Global stop_at_error option to stop at error in any component.
• Fix for more accurate timing with Python 3.
• Updates for GetDist 1.x.
• Module version information stored and checked.
• cobaya-run --no-mpi option to enable testing without mpi even on nodes with mpi4py installed.
• cobaya-run-job command to make a single job script and submit.
• docs include inheritance diagrams for key classes.
• renames path_install to packages_path, -m command line options to -p.
• cobaya-install saves the installation folder in a local config file. It does not need to be specified later at running, reinstalling, etc. Use cobaya-install --show-packages-path to show current one.
• Added cobaya-install --skip keyword1 keyword2 ... to skip components according to a list of keywords.
• Added citation info of Cobaya paper: arXiv:2005.05290
• Lots of other minor fixes and enhancements.

Likelihoods and Theories

• Support for external likelihoods and theories, referenced by fully qualified package name.
• Allow referencing likelihood class names directly (module.ClassName).
• Ability to instantiate Likelihood classes directly outside Cobaya (for testing of external likelihoods or use in other packages).
• Inherited likelihoods inherit .yaml file from parent if no new one is defined.
• Theories and likelihoods specify requirements and define derived products with general dependencies. get_requirements() function replaces add_theory().
• needs() method renamed to must_provide(), and can now return a dictionary of requirements conditional on those passed.
• requires and provides yaml keywords to specify which of ambiguous components handles specific requirements.
• three initialization methods: initialize (from __init__), initialize_with_params (after parameter assignment) and initialize_with_provider (once all configured).
• Likelihood now inherits from Theory, with general cached compute and deque states.
• Likelihood and Theory can be instantiated from {external: class}.
• Derived parameters in likelihood .yaml can be explicitly tagged with derived:True.
• Renamed renames of likelihood to aliases (to avoid clash with renames for parameters).
• Added automatic aggregated chi2 for likelihoods of the same type.
• More documentation for how to make internal and external likelihood classes.
• Support for HelperTheory classes to do sub-calculations for any Theory class with separate nuisance parameters and speeds.
• classmethod get_class_options() can be used to generate class defaults dynamically based on input parameters.
• Added tests: test_dependencies.py, test_cosmo_multi_theory.py.
• External likelihood functions: changed how derived parameters are specified and returned, and how externally-provided quantities are requested and obtained at run time (see docs).

Samplers

• Samplers can now be initialized passing an already initialized model.
• Return value of cobaya-run now (updated_info, sampler_instance). Sampler products can be retrieved as sampler_instance.products().
• Sampler method now sets cache size.
• Automatic timing of likelihood and theory components to determine speed before constructing optimized blocking.
• Amount of oversampling can now be changed for MCMC and PolyChord, and it is taken into account at block sorting.
• Better dealing with files created during sampling: now all are identified and removed when --force used (using regexps).
• Added cobaya-run --test option that just initializes model and sampler.

MCMC

• Added progress tracking (incl. acceptance rate), and a plotting tool for it.
• Dragging now exploits blocks within slow and fast groups.

PolyChord

• Updated to PolyChord 1.17.1.
• Changed naming convention for raw output files, and added getdist-compatible .paramnames.
• Many defaults changes and useful documentation (Thanks Will Handley @williamjameshandley).

Minimize

• Support for auto-covmat as for mcmc.
• Fix for different starting points starting from existing chains using mpi.
• Fixes for bounds and rounding errors.
• Steps set from diagonal of inverse of covariance (still no use of correlation structure).
• Warnings for differences between mpi starting points.

Cosmology

• Added matter_power_spectrum theory output for z,k,P(k) unsplined arrays.
• Fixed several bugs with Pk_interpolator (e.g. conflicts between likelihoods).
• Pk_interpolator calling arguments now different.
• Added sigma_R for linear rms fluctuation in sphere of radius R.
• Fixed problems with getting same background array theory results from different likelihoods.
• renamed H (array of H(z)) to Hubble.
• Boltzmann codes now consistent with varying T_CMB.
• changed use_planck_names to more general use_renames etc.
• DES likelihood now use numba if installed to give nearly twice faster performance.
• GUI input file generator allows to inspect auto-selected covariance matrices.

CAMB

• Calculation using transfer functions for speed up when only initial power spectrum and non-linear model parameters changed (even for non-linear lensing).
• Optimizations for which quantities computed.
• Option to request CAMBdata object from CAMB to access computed results directly.
• Fix for getting source windows power spectra.
• external_primordial_pk flag to optionally use a separate Cobaya Theory to return to the (binned) primordial power spectrum to CAMB.
• exposes all possible input/output parameters by introspection, making it easier to combine with other Theory classes using same parameter names.

CLASSY

• Updated to 2.9.3.
• Many small fixes.

2.0.3 – 2019-09-09

Samplers

PolyChord

• Fixed too much oversampling when manual blocking (#35). Thanks Lukas Hergt (@lukashergt), Vivian Miranda (@vivianmiranda) and Will Handley (@williamjameshandley)
• Fixed ifort compatibility (#39, PR #42). Thanks Lukas Hergt (@lukashergt)

MCMC

• Fixed: using deprecated Pandas DataFrame method (#40). Thanks Zack Li (@xzackli)

Minimize

• Added GetDist output for best-fit (ignore-prior: True)

Likelihoods

• Added stop_at_error for likelihoods -- fixes #43. Thanks Lukas Hergt (@lukashergt)

Cosmology

• Fixed high-DPI screens (#41).

2.0 – 2019-08-20

General

• Added fuzzy matching for names of modules and parameters in a few places. Now error messages show possible misspellings.
• Modules can now be nested, e.g. planck_2018_lowl.TT and planck_2018_lowl.EE as TT.py and EE.py under folder likelihoods/planck_2018_lowl.

Getting help offline: defaults, and bibliography

• cobaya-citation deprecated in favour of cobaya-bib. In addition to taking .yaml input files as below, can now take individual module names.
• cobaya-doc added to show defaults for particular modules.
• Added menu to cobaya-cosmo-generator to show defaults for modules.

I/O

• Naming conventions for output files changed! *.updated.yaml instead of *.full.yaml for updated info, *.[#].txt instead of _[#].txt for chains, etc (see Output section in documentation).

Samplers:

• New, more efficient minimizer: pyBOBYQA.

Cosmology:

• Added full suite of Planck 2018 likelihoods.
• Added late-time source Cl's as a cosmological observable (CAMB only, for now)
• Changed capitalisation of some function and requests (deprecation messages and retrocompatibility added)

1.2.2 – 2019-08-20 (archived version)

General

• Backported some bug fixes.
• Fixed versions of external codes.

Cosmology:

• Planck: Fix for calibration parameter being ignored in CMBlike version of lensing likelihood.

1.2.0 – 2019-06-18

General

• Added --version argument for cobaya-run
• Many bug-fixes for corner-cases

Post-processing (still BETA: fixing conventions)

• Importance re-weighting, adding derived parameters, etc.

Collections

• Now picklable!
• Support for skip and thin

Samplers

Evaluate

• Multiple evaluations with new N option.

PolyChord

• Updated to version 1.16
• Handles speed-blocking optimally, including oversampling (manual blocking also possible).

Likelihoods

• Reworked input/output parameters assignment (documented in DEVEL.rst)
• Removed deprecated gaussian

Cosmo theories:

• Capitalization for observables now enforced! (fixed H=H(z) vs h ambiguity)
• CAMB and CLASS: fixed call without observables (just derived parameters)

1.1.3 – 2019-05-31

Bugfixes (thanks Andreas Finke!)

I/O

• Fuzzy-matching suggestions for options of blocks.

1.1.2 – 2019-05-02

Bugfixes (thanks Vivian Miranda!)

1.1.1 – 2019-04-26

I/O

• More liberal treatment of external Python objects, since we cannot check if they are the same between runs. So force_reproducible not needed any more! (deprecation notice left)

1.1.0 – 2019-04-12

Python 3 compatibility – lots of fixes

Cosmological likelihoods

Planck

• clik code updated for compatibility with Python 3 and modern gcc versions

Cosmological theory codes

camb

• Updated to 1.0 (installing from master branch, considered stable)

classy

• Updated to ...
• Added P(k) interpolator

Samplers

MCMC

• Manual parameter speed-blocking.

PolyChord

• Now installable with cobaya-install polychord --modules [/path]

Cosmology input generator

• Added "citation" tab.

1.0.4 – 2019-04-11 (archived version)

Many bugfixes -- special thanks to Guadalupe Cañas-Herrera and Vivian Miranda!

I/O

• More permissive resuming.

Parameterization and priors

• Made possible to fix a parameter whose only role is being an argument of a dynamically defined one.
• Likelihoods can be used in dynamical derived parameters as chi2__[name] (cosmological application: added automatic consolidated CMB and BAO likelihoods).

Samplers

General

• Seeded runs for evaluate, mcmc and polychord.

MCMC

• Small improvements to callback functions.

PolyChord

• Updated to PolyChord 1.15 and using the official GitHub repo.
• Fixed output: now -logposterior is actually that (was chi squared of posterior).
• Interfaced callback functions.

Likelihoods

Created gaussian_mixture and added deprecation notice to gaussian

Cosmological theory codes

General

• Added P(k) interpolator as an observable (was already available for CAMB, but not documented)

classy

• Updated to 2.7.1
• Added P(k) interpolator

Cosmological likelihoods

DES

• Added Y1 release likelihoods (arXiv:1708.01530)

BICEP-Keck

• Updated to 2015 data (arXiv:1810.05216) and renamed to bicep_keck_2015.