Niko Huurre

Improve step size adaptation target

17

#### Summary: The step size adaptation targets a suboptimal "acceptance statistic". #### Description: About two and half years ago issue #2789 pointed out a problem with the calculation of the...

Fix size-zero mass matrix

16

#### Submission Checklist - [X] Run unit tests: `./runTests.py src/test/unit` - [X] Run cpplint: `make cpplint` - [X] Declare copyright holder and open-source license: see below #### Summary Fixes a...

One redundant gradient evaluation on every iteration

2

#### Summary: The number of log prob gradient evaluations per sample is one greater than the reported `n_leapfrog` for that sample. This does not need to be so; the gradient...

Skip metric regularization if adapt window=0

3

#### Submission Checklist - [X] Run unit tests: `./runTests.py src/test/unit` - [X] Run cpplint: `make cpplint` - [X] Declare copyright holder and open-source license: see below #### Summary This came...

Don't enforce `fixed_param` sampler when model has no parameters

7

#### Submisison Checklist - [X] Run tests: `./runCmdStanTests.py src/test` - [X] Declare copyright holder and open-source license: see below #### Summary: Before CmdStan 2.27 you could not sample from a...

The following model fails to initialize due to bad gradient if `s = 1` or `s = 2` but initializes fine when `s = 3` and `s = 4`. ```stan...

What does this Stan code do? ```stan if (x < y < z) { ``` The natural (naïve?) reading is that the condition asks if x < y and y...

Closures (again)

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The stanc3 part of ~~stan-dev/math#2094~~ stan-dev/math#2384 ## Copyright and Licensing By submitting this pull request, the copyright holder is agreeing to license the submitted work under the BSD 3-clause license...

Simplify parser

1

Simplify parser The parser distinguishes between `var_decl`, `top_var_decl`, and `top_var_decl_no_assign` even though the AST does not. There's no logical need for the grammar to have three separate rules; semantic check...