Prevent division by zero in GPR when y_train is constant#18388

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boricles wants to merge 9 commits intoscikit-learn:mainfrom

boricles:sklearn_gp_ytrainstd_0_18318

Commits on Sep 13, 2020

add very small number to the y_train.std to avoid a divide by zero error
bm.villazon
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add very small number to the y_train.std to avoid a divide by zero error - fix line length to pass lin test
bm.villazon
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Commits on Sep 14, 2020

adding an if check to add epsilon only when _y_train_std==0
bm.villazon
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proper if check included to add epsilon only when _y_train_std==0
bm.villazon
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Commits on Sep 19, 2020

assign _y_train.std to 1 when _y_train.std is zero to avoid divide by zero error
bm.villazon
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Commits on Sep 20, 2020

suggestions, by alfaro96, included to better understanding of the code, and the use of boolean masks
bm.villazon
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minor fix, includ missing whitespace around operator
bm.villazon
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Included test for constant target to check the private _y_train_std attribute has a standard deviation of 1
bm.villazon
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Minor fixes after checking with flake8
bm.villazon
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