…gression (#13336)

* add skeleton for fit_intercept with sparse_cg

* fix sparse_cg solver with fit_intercept=True

* fix test

* linting

* add what's new entry

* remove X_scale and X_offset from public interface of ridge_regression

* reformat if clause

* fixed linting issues

* add comments on about the conditions of different code branches

* update warning

* remove whitespace

* add extra checks in the test of ridge with fit_intercept

* remove unused argument

* DOC Fix warning in about.rst

* DOC Fix warning in datasets/index.rst

* DOC Remove backtick causing warning

* initial commit

* used random class

* fixed failing testcases, reverted __init__.py

* fixed failing testcases #2
- passed rng as parameter to ParameterSampler class
- changed seed from 0 to 42 (as original)

* fixed failing testcases #2
- passed rng as parameter to SparseRandomProjection class

* fixed failing testcases #4
- passed rng as parameter to GaussianRandomProjection class

* fixed failing test case because of flake 8

* add implementation details of Isolation Forest

* fix formula syntax

…dict (#13368)

* Fix bad double to integer cast in __fit_and_predict for cross_val_predict

* Fix flake8 errors

* Add documentation to changelog

* make sure huber works with boolean X

* update what's new

* lint

* review

* pep8

* DOC Adds term to column_transformer

* DOC Adjusts sphinx resolution

* DEV Adds comment

* ENH Uses python instead of css

* add extract method parameter

* change fancy to sqlnk

* test for invalid extract_method value

* test easy dbscan

* pep8

* add extract_sqlnk

* mention which parameter is used for which extact method

* add tests for extract methods with no params given

* Add the reference for the SQLNK method.

* make extract_optics_dbscan and extract_optics_sqlnk public

* fix references, sync docstrings

* fix more morege conflicts

* reorganize the code and get it closer to what we want

* pep8

* remove sqlnk, make compute_optics_graph public

* pep8

* remove unused reference

* make tests pass

* fix docstrings

* fix removal of removed parameter

* add back min_cluster size, xi needs it

* pep8

* fix docstring issue

* address Hanmin's comments

* remove core_sample_indices_

* fix comment

* pep8

* apply comments, remove example

* add public functions to classes.rst and __init__

* address Joel's comments

…object dtype (#13348)