| Class | Description | 
|---|---|
| Dag<N extends Lop> | 
 Class to maintain a DAG of lops and compile it into 
 runtime instructions, incl piggybacking into jobs. 
 | 
| LopComparator<N extends Lop> | 
 Comparator class used in sorting the LopDAG in topological order. 
 | 
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