Issue running python setup.py build develop

[zaidhassanch]

🐛 Bug

To Reproduce

Steps to reproduce the behavior:

1. Follow instructions in INSTALL.MD to install maskrcnn-benchmark
2. Install dependencies
3. python setup.py build develop (in the maskrcnn-benchmark directory)

error: invalid initialization of reference of type ‘const at::Type&’ from expression of type ‘c10::ScalarType’ AT_DISPATCH_FLOATING_TYPES(input.scalar_type(), "ROIAlign_forward", [&] { ^ /home/ahmad/anaconda3/envs/mrcnn2/lib/python3.7/site-packages/torch/lib/include/ATen/Dispatch.h:15:32: note: in definition of macro ‘AT_DISPATCH_FLOATING_TYPES’ const at::Type& the_type = TYPE; \ ^ error: command 'gcc' failed with exit status 1

Expected behavior

Successful run of the setup.py script

Environment

Collecting environment information...
PyTorch version: 1.0.1.post2
Is debug build: No
CUDA used to build PyTorch: None

OS: Ubuntu 16.04.5 LTS
GCC version: (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609
CMake version: Could not collect

Python version: 3.7
Is CUDA available: No
CUDA runtime version: No CUDA
GPU models and configuration: No CUDA
Nvidia driver version: No CUDA
cuDNN version: No CUDA

Versions of relevant libraries:
[pip] numpy==1.16.2
[pip] torch==1.0.1.post2
[pip] torchvision==0.2.2
[conda] blas 1.0 mkl
[conda] mkl 2019.1 144
[conda] mkl_fft 1.0.10 py37ha843d7b_0
[conda] mkl_random 1.0.2 py37hd81dba3_0
[conda] pytorch-cpu 1.0.1 py3.7_cpu_2 pytorch
[conda] torchvision-cpu 0.2.2 py_3 pytorch

Additional context

Changing AT_DISPATCH_FLOATING_TYPES(input.scalar_type(), "ROIAlign_forward"..
to AT_DISPATCH_FLOATING_TYPES(input.type(), "ROIAlign_forward"..
seems to solve the problem

[zaidhassanch]

#557 gives the recommended solution, thus I am closing the issue.
#567, submitted around the same time as this issue, references the same problem.

[zaidhassanch]

Duplicate of #567