* removing dependent to fluid/framework/eigen.h in phi

* more fix according to PR-CI-Py3 fail

* move incubate to geometric

* add paddle.geometric

* fix unittest bug

* add float16 support for segment op

* change reindex and sample neighbors flag name

* add heter graph reindex

* move sample_neighbors.py to neighbors.py

* delete khop_sampler in geometric

* delete unused code

* change sample_neighbors api input order

* fix en doc

* fix unittest

* fix unittest

* change reindex

* fix division by 0

* delete unnecessary input argument

* delete final_state

* move segment_pool to phi.

* mark summed ids as optional tensor.

* fix as reviews.