…to i12-unscented-kalman

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

…to i12-unscented-kalman

…to i12-unscented-kalman

…lman

…osts.py

…ebuilding, updt. plot2D

…s, add rebuild parameters functionality to problem.evaluate(), updt. example

… change private reference to public in design example

…to i12-unscented-kalman

…l-error-for-apple-silicon

Removes NLOpt Methods

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.1.14 → v0.2.0](astral-sh/ruff-pre-commit@v0.1.14...v0.2.0)

…e-config

chore: update pre-commit hooks

* Move cost from call to evaluate

* Rename and add n_states

* Rename and update UkfFilter to SquareRootUKF

Update the paper reference, the value of kappa (from 1 to 0), the allowed input values to observe, and the SquareRootUKF functions: init, filtered_cholupdate and cholupdate to cope with downdates as well as updates.

* Add example and update tests

* Rename exponential_decay as standalone/model

* Make observers a type of problem

- update model parameters to parameter_set
- add n_outputs to BaseCost
- remove observer from FittingProblem
- change solver to _solver
- add evaluate and problem inputs to Observer
- except all Exception from call to solver
- add dataset to UnscentedKalman
- update tests to match

* Update to cope with subset of states

* Add spm_UKF example

* Update bool_mask

* Update state indices

initial sketch of observers with UKF as method

…d-martinjrobins

docs: add martinjrobins as a contributor for code, and test

…alparameters into develop

* Add intermediate model classes

* Update spm_electrode_design.ipynb

* Add test for GravimetricEnergyDensity

* Update pybop/models/empirical/ecm_base.py
Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

* Update pybop/models/lithium_ion/echem_base.py
Co-authored-by: Brady Planden <55357039+BradyPlanden@users.noreply.github.com>

…ptimisation-functionality

Design Optimisation Refactor and Additions

* Add VolumetricEnergyDensity example

* Update CHANGELOG.md

* Update test_cost.py

* Update example to pass coverage tests

* Split cost classes by type

* Add DesignCost to init

* Update error checking