Use scipy's decompositions in PCA.

[fkdosilovic]

Description

Use scipy's decompositions in PCA.

Related issues or pull requests

Fixes https://github.com/rasbt/mlxtend/issues/1078

Pull Request Checklist

• [x] Added a note about the modification or contribution to the ./docs/sources/CHANGELOG.md file (if applicable)
• [x] Added appropriate unit test functions in the ./mlxtend/*/tests directories (if applicable)
• [ ] Modify documentation in the corresponding Jupyter Notebook under mlxtend/docs/sources/ (if applicable)
• [x] Ran PYTHONPATH='.' pytest ./mlxtend -sv and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., PYTHONPATH='.' pytest ./mlxtend/classifier/tests/test_stacking_cv_classifier.py -sv)
• [x] Checked for style issues by running flake8 ./mlxtend

[fkdosilovic]

Benchmark code and results:

Results on AMD Ryzen 5 5625U with 6 cores (12 threads):

Timings are reported in seconds. Each experiment was run 10 times.

method	shape	avg	std	min	max
numpy.linalg.svd	(10, 10)	0.00	0.00	0.00	0.00
	(100, 100)	0.00	0.00	0.00	0.01
	(500, 500)	0.05	0.01	0.04	0.07
	(1000, 1000)	0.23	0.02	0.21	0.27
	(5000, 1000)	4.07	0.15	3.90	4.39
scipy.linalg.svd	(10, 10)	0.00	0.00	0.00	0.00
	(100, 100)	0.00	0.00	0.00	0.01
	(500, 500)	0.04	0.00	0.04	0.05
	(1000, 1000)	0.20	0.01	0.19	0.23
	(5000, 1000)	3.92	0.14	3.80	4.25

scipy v1.11.4 and numpy v1.26.3

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.32%. Comparing base (8592cc7) to head (f61c01c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1080 +/- ## ========================================== - Coverage 78.34% 78.32% -0.02% ========================================== Files 196 196 Lines 11157 11158 +1 Branches 1404 1404 ========================================== - Hits 8741 8740 -1 - Misses 2199 2200 +1 - Partials 217 218 +1 ```

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