Add initial/mean point to chains to fix #243

[toastedcrumpets]

I've attempted to patch issue #243. Running pytest before/after the patch I get the same number of errors, i.e.

collected 300 items

espei/analysis.py .                                                                                              [  0%]
espei/datasets.py .                                                                                              [  0%]
espei/espei_script.py .                                                                                          [  1%]
espei/plot.py ssss                                                                                               [  2%]
espei/priors.py ....                                                                                             [  3%]
espei/sublattice_tools.py ..                                                                                     [  4%]
espei/utils.py ....                                                                                              [  5%]
espei/parameter_selection/model_building.py .                                                                    [  6%]
espei/parameter_selection/redlich_kister.py .                                                                    [  6%]
tests/test_core_utils.py .....                                                                                   [  8%]
tests/test_database_utils.py ................................................................................... [ 35%]
................................................................................                                 [ 62%]
tests/test_datasets.py ............x.                                                                            [ 67%]
tests/test_error_functions.py ...............................                                                    [ 77%]
tests/test_mcmc.py ...xx....                                                                                     [ 80%]
tests/test_model_building.py ..........                                                                          [ 83%]
tests/test_optimizer.py .                                                                                        [ 84%]
tests/test_parameter_generation.py ....................                                                          [ 90%]
tests/test_parameter_generation_utils.py ....                                                                    [ 92%]
tests/test_plotting.py ....                                                                                      [ 93%]
tests/test_schema.py ..........                                                                                  [ 96%]
tests/test_utils.py ..........                                                                                   [100%]

Happy to have comments/reviews!

[bocklund]

@toastedcrumpets Thanks for putting something together! It looks like there's just one failure introduced where we test that the parameter initialization is consistent and not changing. Since this code explicitly changes the parameter initialization, can you please update that test?

Otherwise looks great :)

[bocklund]

Here's a link to the function that needs to be updated:

ESPEI/tests/test_mcmc.py

Line 127 in 95b0973

def test_parameter_initialization():

[toastedcrumpets]

Apologies @bocklund, I didn't see that test failure for some reason, but sure enough its there when I rerun pytest now. I've patched this if you want to try rerunning the checks?

[bocklund]

Thanks, looks great! :)