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[Feature] Add `state_dict`, `load_state_dict`, `param_groups` to `dgl.optim.SparseGradOptimizer` (#5311)

* init update

* all get/set optm_state

* add unit tests

* add docstring

* fix for multiple embeddings

* move embedding methods to private

* fix lint

* fix unit tests

* resolve comments

* merge master

* rename

* remove test transpose

* udpate

* rename

* cleanup

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Co-authored-by: Ubuntu <ubuntu@ip-172-31-28-63.ap-northeast-1.compute.internal>

[bugfix] Fix assertions in /src/runtime/workspace.h and expand unit tests for sparse optimizer (#5299)

* Fix assertions for size 0 workspaces

* Expand unit test to cover case of communication

* Fixes

* Format

* Fix c++ formatting

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* Add uva by default to embedding

* More updates

* Update optimizer

* Add new uva functions

* Expose new pinned memory function

* Add unit tests

* Update formatting

* Fix unit test

* Handle auto UVA case when training is on CPU

* Allow per-embedding decisions for whether to use UVA

* Address spares_optim.py comments

* Remove unused templates

* Update unit test

* Use dgl allocate memory for pinning

* allow automatically unpin

* workaround for d2h copy with a different dtype

* fix linting

* update error message

* update copyright
Co-authored-by: Xin Yao <xiny@nvidia.com>
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>

* try fix

* try fix

* try fix

* try fix

* Revert "try fix"

This reverts commit a3fa0b1e9c0ab892cc3a22acf3770903db8b14a7.

* try fix shared memory

* try fix shared memory

* try fix image version

* fix

[Bug fix] Use shared memory for grad sync when NCCL is not avaliable as PyTorch distributed backend. (#3034)

* Use shared memory for grad sync when NCCL is not avaliable as PyTorch distributed backend.

Fix small bugs and update unitests

* Fix bug

* update test

* update test

* Fix unitest

* Fix unitest

* Fix test

* Fix

* simple update
Co-authored-by: Ubuntu <ubuntu@ip-172-31-24-212.ec2.internal>

* Split from NCCL PR

* Fix type in comment

* Expand documentation for sparse_all_to_all_push

* Restore previous behavior in example

* Re-work optimizer to use NCCL based on gradient location

* Allow for running with embedding on CPU but using NCCL for gradient exchange

* Optimize single partition case

* Fix pylint errors

* Add missing include

* fix gradient indexing

* Fix line continuation

* Migrate 'first_step'

* Skip tests without enough GPUs to run NCCL

* Improve empty tensor handling for pytorch 1.5

* Fix indentation

* Allow multiple NCCL communicator to coexist

* Improve handling of empty message

* Update python/dgl/nn/pytorch/sparse_emb.py
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

* Update python/dgl/nn/pytorch/sparse_emb.py
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

* Keepy empty tensor dimensionaless

* th.empty -> th.tensor

* Preserve shape for empty non-zero dimension tensors

* Use shared state, when embedding is shared

* Add support for gathering an embedding

* Fix typo

* Fix more typos

* Fix backend call

* Use NodeDataLoader to take advantage of ddp

* Update training script to share memory

* Only squeeze last dimension

* Better handle empty message

* Keep embedding on the target device GPU if dgl_sparse if false in RGCN example

* Fix typo in comment

* Add asserts

* Improve documentation in example
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

* Fix #2856

* upd

* Fix unitest

* upd

* upd

* upd

* Fix
Co-authored-by: Ubuntu <ubuntu@ip-172-31-57-25.ec2.internal>

* Add sparse embedding for dgl and update rgcn example

* upd

* Fix

* Revert "Fix"

This reverts commit 4da87cdfb8b8c3506b7fc7376cd2385ba8045c2a.

* Fix

* upd

* upd

* Fix

* Add unitest and update impl

* fix

* Clean up rgcn example code

* upd

* upd

* update

* Fix

* update score

* sparse for sage

* remove model sparse

* upd

* upd

* remove global norm

* revert delete model_sparse.py

* update according to comments

* Fix doc

* upd

* Fix test

* upd

* lint

* lint

* lint

* upd

* upd

* clean up
Co-authored-by: Ubuntu <ubuntu@ip-172-31-56-220.ec2.internal>