Replace naive.stamp with naive.stump, with new parameter row_traversal #598
Description
As discussed in PR #595, we would like to replace naive.stamp with naive.stump(...., row_traversal=True). It seems that the function naive.stamp is used in several unit test files. To avoid pushing all these files, I created this issue so that we can address it first before moving forward in the PR, and make sure it passes all unit tests.