Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22236
@holdenk @srowen anyway I realized that computing the lift for previously
saved models is not feasible as we don't know the number of training records,
so we cannot compute the items support.
I'll keep the re-computation at read time in order to avoid saving the
`itemSupport` map, but for previous models the lift is going to be null as we
cannot compute it. Thanks.
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