Return occupied booleans in retrieve #2226

Job	Run time
benchmarks	1m 36s
coverage	1m 36s
docs	2m 4s
examples	3m 22s
pin	3m 31s
pre-commit	1m 4s
test (ubuntu-latest, 3.11)	1m 20s
tutorials_list	5s
test (macos-latest, 3.11)	2m 40s
test (windows-latest, 3.11)	5m 44s
tutorials (tutorials/arm_repertoire.ipynb)	1m 46s
tutorials (tutorials/cma_mae.ipynb)	3m 8s
tutorials (tutorials/features/example.ipynb)	57s
tutorials (tutorials/fooling_mnist.ipynb)	2m 42s
tutorials (tutorials/lsi_mnist.ipynb)	3m 12s
tutorials (tutorials/lunar_lander.ipynb)	1m 50s
tutorials (tutorials/tom_cruise_dqd.ipynb)	8m 22s
deploy	0s
	44m 59s

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