!20 compiler sig meeting notes 001

Merge pull request !20 from vlne-v1/compiler-sig-meeting-notes-001

sigs/compiler/meetings/001-20200518.md → sigs/compiler/meetings/001-20200519.md

@@ -17,6 +17,11 @@ https://meet.jit.si/MindSporeCimpilerSIG
 
 ## Notes
 
+1. The long-term solution is to support the `SparseTensor` feature (inherited from `MetaTensor`), but the landing period will be longer.
+2. The quick support solution is to express this sparse structure with `DataClass`, and `Class` will be convert to `tuple` in `clean.cc`. The implement can reference `SequenceIterator`, and use `MultiType` to add a overload for add op and gradient update, if necessary.
+3. `GatherV2` can use the `ScatterNDUpdate` to update the gradient.
+
 ## Action items
 
-* None
+* Make a demo with `DataClass`.
+* Design the full solution for `SparseTensor`.