* Use astype(.., copy=False) when possible
* Use Use astype(.., copy=False) also in tests
* Fix CI
* Guillaume's comments
* Address review comments
* Add what's new
* Fix CI
* Lint
* Fix merge issues
* More merge conflict fixes
* Fix failing test
* Lint
* Use copy=True in cluster/hierarchical
* More fixes
* add pprint for estimators
* strip color from length, add color option
* Minor cleaning, fixes, factoring and docs
* Added some basic tests
* Fixed line length issue
* fixed flake8 and added visual test for review
* Fixed test
* Fixed Python 2 issues (inspect.signature import)
* Trying to fix flake8 again
* Added special repr for functions
* Added some other visual tests
* Changed _format_function in to _format_callable
because callable() returns True also for class objects (which we want to
reprensent with their name as well anyway)
* Consistent output in Python 2 and 3
* WIP
* Now using the builtin pprint module
* pep8
* Added changed_only param
* Fixed printing when string would fit in less than line width
* Fixed printing of steps parameter
* Fixed changed_only param for short estimators
* fixed pep8
* Added some more description in docstring
* changed_only is now an option from set_config()
* Put _pprint.py into sklearn/utils, added tests
* Added doctest NORMALIZE_WHITESPACE where needed
* Fixed tests
* fix test-doc
* fixing test that passed before....
* Fixed tests
* Added test for changed_only and long lines
* typo
* Added authors names
* Added license file
* Added ellipsis based on number of elements in sequence + added increasinly aggressive repr strategies
* Updated whatsnew
* dont use increaingly aggressive strategy
* Fixed tests
* Removed LICENSE file and put license text in _pprint.py
* fixed test_base
* Sorted parameters dictionary for consistent output in 3.5
* Actually using OrderedDict...
* Addressed comments
* Added test for NaN changed parameter
* Update whatsnew
* Added example to set_config()
* Removed example
* Added example in gallery
* Spelling
* fix decisionTree issue #12259
* merge splitters
* fix decisionTree issue #12259
* merge splitters
* relaunch tests
* fix for ohe string sizes
* reverse tree changes because not done yet
* error with file
* pylinting
* add regression test and check if categories are strings before casting to object
* pylint
* pylint
* another posibility to handle the strings
* pylint
* pylint
* pylint
* add issue reference and explain the test
* handle object case
* update master test
* update master test
* Update _encoders.py
pylint
* Update test_encoders.py
* Update test_encoders.py
* Update _encoders.py
* Update _encoders.py
* fix checking for object type
* fix checking for object type
* fix checking for object type
* fix checking for object type
* fix encoder
* change check encoder
* add note in whats new
**Reference Issues/PRs**
Fixes#10181
**What does this implement/fix? Explain your changes.**
Added function **get_feature_names()** to **CategoricalEncoder** class. This is in `data.py` under `sklearn.preprocessing`
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Juan Carlos Alfaro Jiménez
Hanmin Qin