ywcb00 opened a new pull request #1559:
URL: https://github.com/apache/systemds/pull/1559


   Hi,
   This PR introduces the MatrixLineagePair as a wrapper around a 
_MatrixObject_ with its corresponding _LineageItem_ in order to nicely couple 
the information of the lineage with a matrix until we broadcast it to the 
federated worker. The lineage trace is then included inside the PUT request of 
the matrix and transferred to the federated worker. To do this, this PR 
includes also a refactoring of the federated instructions which changes the 
MatrixObjects into MatrixLineagePairs whenever they are broadcast.
   
   Thanks for review :)


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