GitLab

* Reimplement cc_attention using pure pytorch

* fix: avoid BC-Breaking

* delete cc_attention related cpp and cuda files

* delete cc_attention related lines in pybind.cpp

* make out Tensor contiguous.

* remove unneeded lines.

* Update mmcv/ops/cc_attention.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Update TestCrissCrossAttention

* passing pre-commit

* Update docstring of CrissCrossAttention

* Update docstring of CrissCrossAttention

* Update mmcv/ops/cc_attention.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* [docs]polish the docstring

* [Docs] Polish the docstring
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>