Added all the ingredients to enforce high quality code

[codecov[bot]]

Codecov Report

Patch coverage: 46.15% and project coverage change: -0.18% :warning:

Comparison is base (ea41fbf) 78.62% compared to head (deb1874) 78.44%.

:exclamation: Current head deb1874 differs from pull request most recent head 812a106. Consider uploading reports for the commit 812a106 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #60 +/- ## ========================================== - Coverage 78.62% 78.44% -0.18% ========================================== Files 36 36 Lines 2975 2974 -1 ========================================== - Hits 2339 2333 -6 - Misses 636 641 +5 ``` | [Files Changed](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs) | Coverage Δ | | |---|---|---| | [cola/\_\_init\_\_.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9fX2luaXRfXy5weQ==) | `100.00% <ø> (ø)` | | | [cola/algorithms/arnoldi.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9hbGdvcml0aG1zL2Fybm9sZGkucHk=) | `94.48% <ø> (-0.05%)` | :arrow_down: | | [cola/algorithms/diagonal\_estimation.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9hbGdvcml0aG1zL2RpYWdvbmFsX2VzdGltYXRpb24ucHk=) | `76.13% <ø> (-0.27%)` | :arrow_down: | | [cola/algorithms/lanczos.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9hbGdvcml0aG1zL2xhbmN6b3MucHk=) | `85.09% <ø> (-0.10%)` | :arrow_down: | | [cola/algorithms/svrg.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9hbGdvcml0aG1zL3N2cmcucHk=) | `9.75% <0.00%> (-0.06%)` | :arrow_down: | | [cola/fns.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9mbnMucHk=) | `80.91% <ø> (ø)` | | | [cola/linalg/nullspace.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9saW5hbGcvbnVsbHNwYWNlLnB5) | `24.63% <0.00%> (-0.74%)` | :arrow_down: | | [cola/linalg/svd.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9saW5hbGcvc3ZkLnB5) | `41.66% <ø> (ø)` | | | [cola/ops/operator\_base.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9vcHMvb3BlcmF0b3JfYmFzZS5weQ==) | `74.69% <ø> (ø)` | | | [cola/ops/operators.py](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs#diff-Y29sYS9vcHMvb3BlcmF0b3JzLnB5) | `85.94% <ø> (ø)` | | | ... and [7 more](https://app.codecov.io/gh/wilson-labs/cola/pull/60?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wilson-labs) | |

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[mfinzi]

Can you explain what it does?

[AndPotap]

@mfinzi , I'm in the process of fixing all the code. I'll explain once I'm done

[AndPotap]

@mfinzi Basically. (1) I added a bash file to add a pre-commit hook for each user so that the formatters are run when they make a commit. (2) Created a Github action that checks both that all the files follow the format and that it follows PEP8 (via flake8). (3) Run the formater on all the files in the repo. (4) Fixed all the errors highlighted by flake8: unsued imports, multiple imports, unsued variables, trailing white spaces, undefined variables, etc.

[AndPotap]

@mfinzi could you accept it to give it a try :upside_down_face: