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* init.

* it's compiled.

* add immutable graph constructor.

* add immutable graph API.

* fix.

* impl get adjacency matrix.

* fix.

* fix graph_index from scipy matrix.

* add neighbor sampling.

* remap vertex ids.

* fix.

* move sampler test.

* fix tests.

* add comments

* remove mxnet-specific immutable graph.

* fix.

* fix lint.

* fix.

* try to fix windows compile error.

* fix.

* fix.

* add test.

* unify Graph and ImmutableGraph.

* fix bugs.

* fix compile.

* move immutable graph.

* fix.

* remove print.

* fix lint.

* fix

* fix lint.

* fix lint.

* fix test.

* fix comments.

* merge GraphIndex and ImmutableGraphIndex.

* temp fix.

* impl GetAdj.

* fix lint

* fix.

* fix.

* fix.

* fix.

* fix.

* use csr only for readonly graph.

* Revert "use csr only for readonly graph."

This reverts commit 8e24bb033af8504531b22849de5b7567b168e0d5.

* remove code.

* fix.

* fix.

* fix.

* fix.

* fix.

* fix.

* address comments.

* fix for comments.

* fix comments.

* revert.

* move test_graph_index to compute.

* fix.

* fix.

* impl GetAdj for coo.

* fix.

* fix tests.

* address comments.

* address comments.

* fix comment.

* address comments.

* use lambda.

* other comments.

* address comments.

* modify the semantics of edges.

* fix order.

* use DGLIdIter

* fix.

* remove NotImplemented.

* revert some code.

* return seed ids.

* fix tests.

* implement.

* correct vid mapping API.

* fix sse.

* add neighbor sampler.

* fix sampler.

* handle non-existing nodes differently in MapParentIdToSubgraphId.

* fix sampling tests.

* parallelize sampling.

* add more tests.

* fix a bug in subgraph loader.

* get number of sampled nodes directly.

* load mxnet CSR to DGLGraph directly.

* create graph from mxnet csr array directly.

* use subgraph loader in SSE.

* fix a bug in sampling.

* output framework tensor.

* fix.

* remove unnecessary code.

* fix tests.

* add SSE README.

* move to contrib.

* address comments.

* add tests.