# Tuesday May 18, 2020 at 18:20pm GMT+8

## Agenda

* Review the design for Sparse update for GatherV2.

## Conference links

https://meet.jit.si/MindSporeCimpilerSIG

## Attendees

* Pan Yifeng (Huawei)
* Wei Luning (Huawei)
* Zhao Zhiqiang (Huawei)
* Huang Dongrun (Huawei)

## 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

* Make a demo with `DataClass`.
* Design the full solution for `SparseTensor`.
