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* 111

* fix 64bits computation

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* fix hetero_from_relations

* remove index_dtype in to_homo and to_hetero

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Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>

current samplers only support working on CPU

* metapath sampler

* lint & fixes

* lint x2

* lint x3

* fix windows

* remove max_cycle argument

* add todo note