[Installation] dense_hash_map: No such file or directory

[MRiabov]

Is there an existing issue for this?

• I have searched the existing issues

Have you followed all the steps in the FAQ?

• I have tried the steps in the FAQ.

Current Behavior

Hello, this is a note for those who have installations of missing google/dense_hash_map:
It can be solved via installing sudo apt-get install libsparsehash-dev. Pypi won't resolve this automatically.

Error Line

In file included from torchsparse/backend/hashmap/hashmap_cpu.cpp:1:
torchsparse/backend/hashmap/hashmap_cpu.hpp:7:10: fatal error: google/dense_hash_map: No such file or directory
7 | #include <google/dense_hash_map>
| ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Environment

- GCC: 11.4.0
- NVCC:12.4
- PyTorch: 2.5.1
- PyTorch CUDA: 12.4

Full Error Log

Error Log

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.'))
In file included from torchsparse/backend/hashmap/hashmap_cpu.cpp:1:
torchsparse/backend/hashmap/hashmap_cpu.hpp:7:10: fatal error: google/dense_hash_map: No such file or directory
7 | #include <google/dense_hash_map>
| ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
error: command '/usr/bin/x86_64-linux-gnu-g++' failed with exit code 1