[core
] Add warning when negative KL
#239
Merged
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What does this PR do?
Fixes: #235
The warning message will be displayed only once, if there is a repetition, as described in the official documentation of
warnings
package: https://docs.python.org/2/library/warnings.html / https://stackoverflow.com/questions/22661745/why-only-one-warning-in-a-loopcc @lvwerra