I ran sudo find / -name "mkl", and it returned
/home/thomas/anaconda3/pkgs/mkl-service-1.1.2-py36h17a0993_4/lib/python3.6/site-packages/mkl
/home/thomas/anaconda3/pkgs/mkl-service-1.1.2-py36_3/lib/python3.6/site-packages/mkl
/home/thomas/anaconda3/lib/python3.6/site-packages/mkl
so I wrote export LD_LIBRARY_PATH="/home/thomas/anaconda3/lib/python3.6/site-packages/mkl" in ~/.bashrc.
But still, nothing changed. Only to return the same ImportError: libmkl_intel_lp64.so: cannot open shared object file: No such file or directory as before.