[Feature Request] MovieLens dataset
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feature request
topic: GNN Utilities
- Dominant language
- Python
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Description
## 🚀 Feature
Add a new `MovieLensDataset` to `dgl.data`.
## Motivation
Requested by https://discuss.dgl.ai/t/movielens-hetrogenous-graph-graphsage-link-prediction/3201/2
## Alternatives
Currently, the MovieLens dataset is available at the [GCMC example](https://github.com/dmlc/dgl/blob/master/examples/pytorch/gcmc/data.py). Users can copy the code but having a built-in module in DGL main library will be more convenient.
## Pitch
A new `dgl.data.MoveLensDataset` class that follows the standard interface of DGLDataset. It should support all three variants (i.e., ml-100k, ml-1m, ml-10m).
## Additional context
None
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