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Re enable IVF random sampling
Random sampling of training set for IVF methods was reverted in https://github.com/rapidsai/raft/pull/2144 due to the large memory usage of the subsample method.
PR #2155 implements a new random sampling method. Using that we can now enable random sampling of IVF methods (#2052 and #2077), therefore this PR reverts #2144, and adjust the code to utilize the new sampling method.
Note this will only compile once #2155 is merged.