[SYSTEMDS-3367] Integrate UDF encoders in task graph#1623
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This patch integrates UDF-based transformencoders into the task graph to allow concurrent execution. As we cannot estimate the sparsity of an arbitrary UDF output, we always allocate dense output matrix if at least one UDF is present. If an UDF comes after a dummycode, we slice the expanded columns and apply the UDF. Moreover, we disable row partitioning for UDFs.
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This patch integrates UDF-based transformencoders into the
task graph to allow concurrent execution. As we cannot estimate
the sparsity of an arbitrary UDF output, we always allocate
dense output matrix if at least one UDF is present. If an UDF
comes after a dummycode, we slice the expanded columns and
apply the UDF. Moreover, we disable row partitioning for UDFs.