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graphs: make init_short_digraph always sort neighbors but without the extra log complexity (2nd try) #38664
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graphs: make init_short_digraph always sort neighbors but without the extra log complexity (2nd try) #38664
cyrilbouvier
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dcoudert
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LGTM.
We will have to work on another PR for these remaining sorts...
vbraun
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Sep 19, 2024
…rs but without the extra log complexity (2nd try) <!-- ^ Please provide a concise and informative title. --> <!-- ^ Don't put issue numbers in the title, do this in the PR description below. --> <!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method to calculate 1 + 2". --> <!-- v Describe your changes below in detail. --> <!-- v Why is this change required? What problem does it solve? --> <!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes sagemath#12345". --> This PR is based on the closed PR sagemath#38427 (by myself) that was breaking too much doctests. This PR improve the `init_short_digraph` function that is used to initialize `StaticSparseCGraph` (used for immutable `Graph` and `DiGraph`). Before, a boolean parameter `sort_neighbors` was used to specify if we wanted to sort the neighbors or not. It implied an extra `log` in the complexity (as `qsort` was called). With this PR, the neighbors are always sorted at no extra cost. It is done by appending to the neighbors list the vertices in the correct order so the call to `qsort` is not needed anymore. This PR partly reverts sagemath#38198 and mostly reverts sagemath#37662 Contrary to PR sagemath#38427, I did not include the patch that remove the sorting of vertices when StaticSparseGraph are initialized because it was breaking too many doctests. Instead I added a option to disabled said sorting and use it in my doctests to check that the new code works. ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> - [x] The title is concise and informative. - [x] The description explains in detail what this PR is about. - [ ] I have linked a relevant issue or discussion. - [x] I have created tests covering the changes. - [ ] I have updated the documentation and checked the documentation preview. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on. For example, --> <!-- - sagemath#12345: short description why this is a dependency --> <!-- - sagemath#34567: ... --> URL: sagemath#38664 Reported by: cyrilbouvier Reviewer(s): David Coudert
vbraun
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Sep 22, 2024
…rs but without the extra log complexity (2nd try) <!-- ^ Please provide a concise and informative title. --> <!-- ^ Don't put issue numbers in the title, do this in the PR description below. --> <!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method to calculate 1 + 2". --> <!-- v Describe your changes below in detail. --> <!-- v Why is this change required? What problem does it solve? --> <!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes sagemath#12345". --> This PR is based on the closed PR sagemath#38427 (by myself) that was breaking too much doctests. This PR improve the `init_short_digraph` function that is used to initialize `StaticSparseCGraph` (used for immutable `Graph` and `DiGraph`). Before, a boolean parameter `sort_neighbors` was used to specify if we wanted to sort the neighbors or not. It implied an extra `log` in the complexity (as `qsort` was called). With this PR, the neighbors are always sorted at no extra cost. It is done by appending to the neighbors list the vertices in the correct order so the call to `qsort` is not needed anymore. This PR partly reverts sagemath#38198 and mostly reverts sagemath#37662 Contrary to PR sagemath#38427, I did not include the patch that remove the sorting of vertices when StaticSparseGraph are initialized because it was breaking too many doctests. Instead I added a option to disabled said sorting and use it in my doctests to check that the new code works. ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> - [x] The title is concise and informative. - [x] The description explains in detail what this PR is about. - [ ] I have linked a relevant issue or discussion. - [x] I have created tests covering the changes. - [ ] I have updated the documentation and checked the documentation preview. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on. For example, --> <!-- - sagemath#12345: short description why this is a dependency --> <!-- - sagemath#34567: ... --> URL: sagemath#38664 Reported by: cyrilbouvier Reviewer(s): David Coudert
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This PR is based on the closed PR #38427 (by myself) that was breaking too much doctests.
This PR improve the
init_short_digraph
function that is used to initializeStaticSparseCGraph
(used for immutableGraph
andDiGraph
).Before, a boolean parameter
sort_neighbors
was used to specify if we wanted to sort the neighbors or not. It implied an extralog
in the complexity (asqsort
was called).With this PR, the neighbors are always sorted at no extra cost. It is done by appending to the neighbors list the vertices in the correct order so the call to
qsort
is not needed anymore.This PR partly reverts #38198 and mostly reverts #37662
Contrary to PR #38427, I did not include the patch that remove the sorting of vertices when StaticSparseGraph are initialized because it was breaking too many doctests. Instead I added a option to disabled said sorting and use it in my doctests to check that the new code works.
📝 Checklist
⌛ Dependencies