RuntimeError: Ninja is required to load C++ extension

[lilingge]

Hi,author. I have followed the instructions on your page. I got your code by git clone, and run "python setup.py install" with no errors. However when I run "python3 demo.py", I got the error like this:

Traceback (most recent call last):
File "/home/llg/.local/lib/python3.5/site-packages/torch/utils/cpp_extension.py", line 873, in verify_ninja_availability
subprocess.check_call('ninja --version'.split(), stdout=devnull)
File "/usr/lib/python3.5/subprocess.py", line 576, in check_call
retcode = call(*popenargs, **kwargs)
File "/usr/lib/python3.5/subprocess.py", line 557, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/lib/python3.5/subprocess.py", line 947, in init
restore_signals, start_new_session)
File "/usr/lib/python3.5/subprocess.py", line 1551, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'ninja'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "1.py", line 2, in
import encoding
File "/home/llg/Documents/PyTorch-Encoding/encoding/init.py", line 13, in
from . import nn, functions, parallel, utils, models, datasets, transforms
File "/home/llg/Documents/PyTorch-Encoding/encoding/nn/init.py", line 12, in
from .encoding import *
File "/home/llg/Documents/PyTorch-Encoding/encoding/nn/encoding.py", line 18, in
from ..functions import scaled_l2, aggregate, pairwise_cosine
File "/home/llg/Documents/PyTorch-Encoding/encoding/functions/init.py", line 2, in
from .encoding import *
File "/home/llg/Documents/PyTorch-Encoding/encoding/functions/encoding.py", line 14, in
from .. import lib
File "/home/llg/Documents/PyTorch-Encoding/encoding/lib/init.py", line 15, in
], build_directory=cpu_path, verbose=False)
File "/home/llg/.local/lib/python3.5/site-packages/torch/utils/cpp_extension.py", line 645, in load
is_python_module)
File "/home/llg/.local/lib/python3.5/site-packages/torch/utils/cpp_extension.py", line 814, in _jit_compile
with_cuda=with_cuda)
File "/home/llg/.local/lib/python3.5/site-packages/torch/utils/cpp_extension.py", line 837, in _write_ninja_file_and_build
verify_ninja_availability()
File "/home/llg/.local/lib/python3.5/site-packages/torch/utils/cpp_extension.py", line 875, in verify_ninja_availability
raise RuntimeError("Ninja is required to load C++ extensions")
RuntimeError: Ninja is required to load C++ extension

How to overcome it? What's the "Ninja"?

[zhanghang1989]

Please run following command:

wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force 

solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB

[EmmaSRH]

Hi,author. Does the solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB work? I tried it and it still doesn't work.

[lilingge]

Hi,author. Does the solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB work? I tried it and it still doesn't work.

Hi, my problem was solved.However, the code still can't run. I tried many times, even ask an engineer of Dji for help. Finally, my personal opinion is that the stability of the code is poor. I hope you can run it successfully and let me know. Thanks

[nemonameless]

Please run following command:

wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force 

solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB

How to do this without sudo Permission?

[SysOverdrive]

I seem to have the same problem

Traceback (most recent call last):
Traceback (most recent call last):
File "setup.py", line 26, in
'build_ext': BuildExtension
File "\lib\site-packages\setuptools_init_.py", line 144, in setup
return distutils.core.setup(**attrs)
File "\lib\distutils\core.py", line 148, in setup
dist.run_commands()
File "\lib\distutils\dist.py", line 966, in run_commands
self.run_command(cmd)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\install.py", line 67, in run
self.do_egg_install()
File "\lib\site-packages\setuptools\command\install.py", line 109, in do_egg_install
self.run_command('bdist_egg')
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\bdist_egg.py", line 173, in run
cmd = self.call_command('install_lib', warn_dir=0)
File "\lib\site-packages\setuptools\command\bdist_egg.py", line 159, in call_command
self.run_command(cmdname)
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\install_lib.py", line 11, in run
self.build()
File "\lib\distutils\command\install_lib.py", line 107, in build
self.run_command('build_ext')
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\build_ext.py", line 87, in run
_build_ext.run(self)
File "\lib\distutils\command\build_ext.py", line 340, in run
self.build_extensions()
File "\lib\site-packages\torch\utils\cpp_extension.py", line 580, in build_extensions
build_ext.build_extensions(self)
File "\lib\distutils\command\build_ext.py", line 449, in build_extensions
self._build_extensions_serial()
File "\lib\distutils\command\build_ext.py", line 474, in _build_extensions_serial
self.build_extension(ext)
File "\lib\site-packages\setuptools\command\build_ext.py", line 208, in build_extension
_build_ext.build_extension(self, ext)
File "\lib\distutils\command\build_ext.py", line 534, in build_extension
depends=ext.depends)
File "\lib\site-packages\torch\utils\cpp_extension.py", line 562, in win_wrap_ninja_compile
with_cuda=with_cuda)
File "\lib\site-packages\torch\utils\cpp_extension.py", line 1140, in _write_ninja_file_and_compile_objects
error_prefix='Error compiling objects for extension')
File "\lib\site-packages\torch\utils\cpp_extension.py", line 1413, in _run_ninja_build
raise RuntimeError(message)
RuntimeError: Error compiling objects for extension

How can I fix this on a windows machine ?

[houhaol]

Please run following command:

wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force 

solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB

How to do this without sudo Permission?

Just curious. Have you found a method to overcome this sudo permission issue? thanks

[BooPatienze]

Please run following command:

wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force 

solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB

How to do this without sudo Permission?

I just pip install ninja, and then no problem.

[woctezuma]

The simplest solution is sometimes overlooked. Thank you, BooPatienze!

[csyhy1986]

I seem to have the same problem

Traceback (most recent call last):
Traceback (most recent call last):
File "setup.py", line 26, in
'build_ext': BuildExtension
File "\lib\site-packages\setuptools__init__.py", line 144, in setup
return distutils.core.setup(**attrs)
File "\lib\distutils\core.py", line 148, in setup
dist.run_commands()
File "\lib\distutils\dist.py", line 966, in run_commands
self.run_command(cmd)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\install.py", line 67, in run
self.do_egg_install()
File "\lib\site-packages\setuptools\command\install.py", line 109, in do_egg_install
self.run_command('bdist_egg')
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\bdist_egg.py", line 173, in run
cmd = self.call_command('install_lib', warn_dir=0)
File "\lib\site-packages\setuptools\command\bdist_egg.py", line 159, in call_command
self.run_command(cmdname)
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\install_lib.py", line 11, in run
self.build()
File "\lib\distutils\command\install_lib.py", line 107, in build
self.run_command('build_ext')
File "\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "\lib\site-packages\setuptools\command\build_ext.py", line 87, in run
_build_ext.run(self)
File "\lib\distutils\command\build_ext.py", line 340, in run
self.build_extensions()
File "\lib\site-packages\torch\utils\cpp_extension.py", line 580, in build_extensions
build_ext.build_extensions(self)
File "\lib\distutils\command\build_ext.py", line 449, in build_extensions
self._build_extensions_serial()
File "\lib\distutils\command\build_ext.py", line 474, in _build_extensions_serial
self.build_extension(ext)
File "\lib\site-packages\setuptools\command\build_ext.py", line 208, in build_extension
_build_ext.build_extension(self, ext)
File "\lib\distutils\command\build_ext.py", line 534, in build_extension
depends=ext.depends)
File "\lib\site-packages\torch\utils\cpp_extension.py", line 562, in win_wrap_ninja_compile
with_cuda=with_cuda)
File "\lib\site-packages\torch\utils\cpp_extension.py", line 1140, in _write_ninja_file_and_compile_objects
error_prefix='Error compiling objects for extension')
File "\lib\site-packages\torch\utils\cpp_extension.py", line 1413, in _run_ninja_build
raise RuntimeError(message)
RuntimeError: Error compiling objects for extension

How can I fix this on a windows machine ?

I also encounter with this problem on a windows platform, have you solved it bro?

[zhanghang1989]

For Windows, I would recommend using docker https://hangzhang.org/PyTorch-Encoding/notes/compile.html#using-docker

[cuge1995]

Please run following command:

wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force 

solution from https://www.claudiokuenzler.com/blog/756/install-newer-ninja-build-tools-ubuntu-14.04-trusty#.XEDUk89KjOB

It works for me.