Building module external.nms failed: ["distutils.errors.CompileError: command 'gcc' failed with exit status 1\n"]

[Skye-Lin]

I have been struggle with this quiet a long time...
When I run "python demo.py ctdet --demo webcam --load_model ../models/ctdet_coco_dla_2x.pth" as the author writed in the readme page, I got this problem.

`/home/skye/.pyxbld/temp.linux-x86_64-3.7/pyrex/external/nms.c:598:31: fatal error: numpy/arrayobject.h: No such file or directory
compilation terminated.
Traceback (most recent call last):
File "/home/skye/anaconda3/lib/python3.7/distutils/unixccompiler.py", line 118, in _compile
extra_postargs)
File "/home/skye/anaconda3/lib/python3.7/distutils/ccompiler.py", line 909, in spawn
spawn(cmd, dry_run=self.dry_run)
File "/home/skye/anaconda3/lib/python3.7/distutils/spawn.py", line 36, in spawn
_spawn_posix(cmd, search_path, dry_run=dry_run)
File "/home/skye/anaconda3/lib/python3.7/distutils/spawn.py", line 159, in _spawn_posix
% (cmd, exit_status))
distutils.errors.DistutilsExecError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 215, in load_module
inplace=build_inplace, language_level=language_level)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 191, in build_module
reload_support=pyxargs.reload_support)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
dist.run_commands()
File "/home/skye/anaconda3/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/home/skye/anaconda3/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/home/skye/anaconda3/lib/python3.7/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
_build_ext.build_ext.run(self)
File "/home/skye/anaconda3/lib/python3.7/distutils/command/build_ext.py", line 340, in run
self.build_extensions()
File "/home/skye/anaconda3/lib/python3.7/site-packages/Cython/Distutils/old_build_ext.py", line 194, in build_extensions
self.build_extension(ext)
File "/home/skye/anaconda3/lib/python3.7/distutils/command/build_ext.py", line 534, in build_extension
depends=ext.depends)
File "/home/skye/anaconda3/lib/python3.7/distutils/ccompiler.py", line 574, in compile
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
File "/home/skye/anaconda3/lib/python3.7/distutils/unixccompiler.py", line 120, in _compile
raise CompileError(msg)
distutils.errors.CompileError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "centernet/src/demo.py", line 11, in
from detectors.detector_factory import detector_factory
File "/home/skye/centernet/src/lib/detectors/detector_factory.py", line 5, in
from .exdet import ExdetDetector
File "/home/skye/centernet/src/lib/detectors/exdet.py", line 18, in
from external.nms import soft_nms
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 462, in load_module
language_level=self.language_level)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 231, in load_module
raise exc.with_traceback(tb)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 215, in load_module
inplace=build_inplace, language_level=language_level)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyximport.py", line 191, in build_module
reload_support=pyxargs.reload_support)
File "/home/skye/anaconda3/lib/python3.7/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
dist.run_commands()
File "/home/skye/anaconda3/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/home/skye/anaconda3/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/home/skye/anaconda3/lib/python3.7/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
_build_ext.build_ext.run(self)
File "/home/skye/anaconda3/lib/python3.7/distutils/command/build_ext.py", line 340, in run
self.build_extensions()
File "/home/skye/anaconda3/lib/python3.7/site-packages/Cython/Distutils/old_build_ext.py", line 194, in build_extensions
self.build_extension(ext)
File "/home/skye/anaconda3/lib/python3.7/distutils/command/build_ext.py", line 534, in build_extension
depends=ext.depends)
File "/home/skye/anaconda3/lib/python3.7/distutils/ccompiler.py", line 574, in compile
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
File "/home/skye/anaconda3/lib/python3.7/distutils/unixccompiler.py", line 120, in _compile
raise CompileError(msg)
ImportError: Building module external.nms failed: ["distutils.errors.CompileError: command 'gcc' failed with exit status 1\n"]`

I run this code in the google cloud platform. cuda9.0, python3.7.3,pytorch1.2.
Thank you for your solution.

[xingyizhou]

It seems numpy was not installed correctly. Make sure you are using anaconda. For the nms issue, you can comment out the import line. It is not used.