…ybutton

* upstream/master:
  FIX remove FutureWarning in _object_dtype_isnan and add test (scikit-learn#12567)
  DOC Add 's' to "correspond" in docs for Hamming Loss. (scikit-learn#12565)
  EXA Fix comment in plot-iris-logistic example (scikit-learn#12564)
  FIX stop words validation in text vectorizers with custom preprocessors / tokenizers (scikit-learn#12393)
  DOC Add skorch to related projects (scikit-learn#12561)
  MNT Don't change self.n_values in OneHotEncoder.fit (scikit-learn#12286)
  MNT Remove unused assert_true imports (scikit-learn#12560)
  TST autoreplace assert_true(...==...) with plain assert (scikit-learn#12547)
  DOC: add a testimonial from JP Morgan (scikit-learn#12555)

…ikit-learn into add_codeblock_copybutton

* 'add_codeblock_copybutton' of https://github.com/thoo/scikit-learn:
  Move an extension under sphinx_copybutton/
  Move css/js file under sphinxext/
  Fix max_depth overshoot in BFS expansion of trees (scikit-learn#12344)
  TST don't test utils.fixes docstrings (scikit-learn#12576)
  DOC Fix typo (scikit-learn#12563)
  FIX Workaround limitation of cloudpickle under PyPy (scikit-learn#12566)
  MNT bare asserts (scikit-learn#12571)
  FIX incorrect error when OneHotEncoder.transform called prior to fit (scikit-learn#12443)
  Retrigger travis:max time limit error
  DOC: Clarify `cv` parameter description in `GridSearchCV` (scikit-learn#12495)
  FIX remove FutureWarning in _object_dtype_isnan and add test (scikit-learn#12567)
  DOC Add 's' to "correspond" in docs for Hamming Loss. (scikit-learn#12565)
  EXA Fix comment in plot-iris-logistic example (scikit-learn#12564)
  FIX stop words validation in text vectorizers with custom preprocessors / tokenizers (scikit-learn#12393)
  DOC Add skorch to related projects (scikit-learn#12561)
  MNT Don't change self.n_values in OneHotEncoder.fit (scikit-learn#12286)
  MNT Remove unused assert_true imports (scikit-learn#12560)
  TST autoreplace assert_true(...==...) with plain assert (scikit-learn#12547)
  DOC: add a testimonial from JP Morgan (scikit-learn#12555)

This reverts commit 2a25237.

This reverts commit 2a25237.