Try using import-mode=append

Author: vyasr

ci/run_cuml_dask_pytests.sh

@@ -4,4 +4,4 @@
 # Support invoking run_cuml_dask_pytests.sh outside the script directory
 cd "$(dirname "$(realpath "${BASH_SOURCE[0]}")")"/../python/cuml/cuml/tests/dask || exit 1
 
-python -m pytest --cache-clear "$@" .
+python -m pytest --cache-clear --import-mode=append "$@" .