fix AI:Decisiontree #699

Job	Run time
get_dependencies	4m 13s
base_build (-bullseye, arm/v7)	4m 11s
base_build (-bullseye, amd64)	50s
base_build (-bullseye, arm64)	4m 1s
base_build (-bullseye, 386)	48s
base_build (-threaded-bullseye, arm/v7)	4m 4s
base_build (-threaded-bullseye, amd64)	50s
base_build (-threaded-bullseye, arm64)	4m 4s
base_build (-threaded-bullseye, 386)	50s
test_build (-bullseye)	15m 6s
cpan_build (-bullseye, arm/v7)	1h 7m 55s
test_build (-threaded-bullseye)	15m 5s
cpan_build (-bullseye, arm64)	1h 9m 27s
cpan_build (-bullseye, 386)	6m 33s
cpan_build (-threaded-bullseye, arm/v7)	1h 8m 17s
cpan_build (-threaded-bullseye, arm64)	1h 9m 43s
cpan_build (-threaded-bullseye, 386)	6m 12s
published_build (-bullseye)	11m 22s
published_build (-threaded-bullseye)	10m 42s
	6h 4m 13s

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