/usr/lib/python3/dist-packages/torch/include/torch/csrc/utils/pybind.h:6:10: fatal error: pybind11/pybind11.h: No such file or directory

[super-zyw]

Hi I encounter the fatal error when I try to install detectron2 in my PC.
In file included from /usr/lib/python3/dist-packages/torch/include/torch/csrc/api/include/torch/python.h:12,
from /usr/lib/python3/dist-packages/torch/include/torch/extension.h:6,
from /home/biao/detectron2/detectron2/layers/csrc/vision.cpp:3:
/usr/lib/python3/dist-packages/torch/include/torch/csrc/utils/pybind.h:6:10: fatal error: pybind11/pybind11.h: No such file or directory
6 | #include <pybind11/pybind11.h>
| ^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
/usr/lib/python3/dist-packages/torch/utils/cpp_extension.py:351: UserWarning: Attempted to use ninja as the BuildExtension backend but we could not find ninja.. Falling back to using the slow distutils backend.
warnings.warn(msg.format('we could not find ninja.'))
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1