Issue about gcc

 Issue when pip install -e . :

ms_deform_attn_cpu.o: file not recognized: file format not recognized

or

Command '['which', 'x86_64-conda_cos6-linux-gnu-c++']' returned non-zero exit status 1.

Solution:

conda install -c anaconda gcc_linux-64 gxx_linux-64

* Because gcc in anaconda doesn't use the same one with ubuntu. It uses a older one.