A first use case of gap constraint is included in the article.
Another application would be customer-shopping sequence analysis where you
want to put a constraint on the duration between two purchases for them to
be considered as a pertinent sequence.
Additional question regarding the code :
ReversedPrefix is used because scala's List uses a linked list, which has
constant time append to head but linear time append to tail.
I'm aware that there are use cases for the gap constraints. My question was
more about whether any users of Spark/MLlib have an immediate application
for these
CCing the mailing list again.
It's currently not on the radar. Do you have a use case for it? I can bring
it up during 1.6 roadmap planning tomorrow.
On Mon, Aug 24, 2015 at 8:28 PM, alexis GILLAIN ila...@hotmail.com wrote:
Hi,
I just realized the article I mentioned is cited in the jira and
I want to use prefixspan so I had a look at the code and the cited paper :
Distributed PrefixSpan Algorithm Based on MapReduce.
There is a result in the paper I didn't really undertstand and I could'nt
find where it is used in the code.
Suppose a sequence database S = {1,2...n}, a sequence
