add single leading underscore to internal functions and methods

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate
compare.py					202
cross_validate.py
data_splitting.py
hyperparam_searching.py
logging_config.py
model_processing.py
plotting.py					139, 198, 247-251, 262
utils.py
autoemulate/emulators
gaussian_process_sk.py
neural_net_sk.py
support_vector_machines.py
tests
test_cross_validate.py
test_data_splitting.py
test_hyperparam_searching.py
test_model_processing.py
test_plotting.py
test_utils.py
Project Total

This report was generated by python-coverage-comment-action

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 90.23%. Comparing base (43fd17a) to head (41305bf).

Files	Patch %	Lines
autoemulate/plotting.py	44.44%	5 Missing :warning:
autoemulate/compare.py	91.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #185 +/- ## ======================================= Coverage 90.23% 90.23% ======================================= Files 42 42 Lines 1925 1925 ======================================= Hits 1737 1737 Misses 188 188 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.