* experiments: move executor into a module
* experiments: separate executor into base/local
* rename LocalExecutor to TempDirExecutor, run in .dvc/tmp by default
* git: restore HEAD using reset not checkout in detached_head()
* experiments: support calling BaseExecutor.reproduce directly for
workspace runs
* experiments: run single experiments in local workspace by default
* update experiments tests for workspace changes
* experiments: update checkpoints for workspace runs
* update checkpoints tests
* update test_show
* add force param for apply
* exp apply: add --force option
* exp run/res: add --temp option to force tempdir execution for single
experiments
* force apply in non-apply specific tests
* experiments: commit to refs/exps/... instead of branch heads
* update exp show
* restore checkpoint_resume kwarg
* refactor new() to use experiments stash
* experiments: use refspecs to populate and collect executors
* experiments: use new stash and merge on exp checkout
* experiments: fix executor chdir
* experiments: update run and show
* skip checkout after reproduce
* checkpoints: use experiments refspecs
* check if workspace was stashed before applying
* exp show: unify checkpoint/standalone experiment collection
* git: move iter_refs to backend
* update for scm changes
* experiments: replace exp checkout in favor of exp apply
* git: handle rev_parse errors in resolve_commit
* update refs containing and baseline check
* fix sigint handling for checkpoints
* update checkpoint exists behavior
* fix checkpoint baseline behavior
* update tests
* experiments: update gc
* update show tests
* fix type checking errors
* update diff
* scm: add diff, describe
* experiments: generate human readable names
* exp run/resume: allow user specified exp name with -n/--name
* update tests
* experiments: add `exp branch` for promoting experiment to full branch
* fix test
* fix missing file
* experiments: explicitly close scm instances before cleaning up tmp dir
* experiments: Allow branching from checkpoints with modified hyper params
* experiments: initial checkpoints tree functionality for `exp show`
* go back to flat/sortable view
* add test for resume w/modified params
* tests: move experiments fixtures into conftest
* add show checkpoints test
* test checkpoint table rendering
* remove dead code
* test show for checkpoint branches
* experiments: refactor regular/checkpoint experiment separation
* fix scm_checkout pull bug
* experiments: return stages from executor.reproduce
* since executor has to move to threadpool execution anyways, we no
longer have to work around the pickle repro result limitation
* refactor new/resume behavior
* refactor checkpoints tests
* use -f to force checkpoints reset/restart
* checkpoints: use 'exp run' and 'exp res[ume]' commands
* stage: all outs can be missing for checkpoint stages
* regular outputs may not be written at the time a checkpoint is
generated, but subsequent checkouts of that stage should not fail due
to the missing outs
* commit stage on checkpoint generation otherwise non-persist cached outs
are lost
* checkpoints: wait for stage proc to end after killing via terminate()
* stage: fix issues with killing checkpoint stage
* refactor signaling (use threading.Event instead of Condition)
* fix windows bug (kill all child processes via taskkill)
* experiments: refactor executor collection
* tests: move checkpoint tests into separate module
* refactor experiment tests to use stage fixture
Peter Rowlands (변기호)
Ruslan Kuprieiev
Sami Jawhar