Github user AnthonyTruchet commented on the issue:
https://github.com/apache/spark/pull/16078
It is necessary to address it in L-BFGS at least. We propose a solution in
core which can be legitimately rejected as not relevant for core. And two
solutions in MLlib, one provide for a reusable util to aggregate large vectors,
the over one is a specific hack in L-BFGS. At least one of them deserves to be
worked on I believe a Sparse vectors are not an option for performance reasons.
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