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* test hook

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* # This is a combination of 3 commits.
# The first commit's message is:
# This is a combination of 2 commits.
# The first commit's message is:

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# This is the 2nd commit message:

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# This is the 3rd commit message:

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* fix format

* fix format

* ignore doc dir

* fix regex

* fix jenkins error

* exclude another dir

* formatting test_array

* fix version of yapf

* test hook

* formatting

* reinclude dirs

* add the slice test example on gpu.

* change the gpu slice test according to comments.

* rename cpu_lowering to lowering, rename cpu_target to target, so consistent with gpu side.

* fix the format of a file CMakeLists.txt.

* Revert "change the gpu slice test according to comments."

This reverts commit 721bbb180d11811dc914d60fd8a1c91926e3f947.

* Revert "add the slice test example on gpu."

This reverts commit 68dabb05adffd429e5e5d10c3a1def2b06489f63.

* fix a format for the file doc/src/reference/targets.rst