Traceback (most recent call last):
File “test_dist.py”, line 5, in
dist.init_process_group(backend=“NCCL”, init_method=“file:///distributed_test”, world_size=2, rank=0)
File “/home/simon/anaconda3/lib/python3.7/site-packages/torch/distributed/distributed_c10d.py”, line 288, in init_process_group
raise RuntimeError("Distributed package doesn’t have NCCL "
RuntimeError: Distributed package doesn’t have NCCL built in
I install pytorch from the source v1.0rc1, getting the config summary as follows:
USE_NCCL is On, Private Dependencies does not include nccl, nccl is not built-in.

PyTorch Version:v1.0rc1
OS:Ubuntu18.04.1
How you installed PyTorch:source
Build command you used:python setup.py install
Python version:3.7
CUDA/cuDNN version:CUDA10.0, CuDNN7.3.1
GPU models and configuration:GTX1080

–
– ******** Summary ********
– General:
–   CMake version         : 3.12.2
–   CMake command         : /home/simon/anaconda3/bin/cmake
–   System                : Linux
–   C++ compiler          : /usr/bin/c++
–   C++ compiler version  : 7.3.0
–   BLAS                  : MKL
–   CXX flags             : -msse3 -msse4.1 -msse4.2   --std=c++11  -Wno-deprecated -fvisibility-inlines-hidden -fopenmp -O2 -fPIC -Wno-narrowing -Wall -Wextra -Wno-missing-field-initializers -Wno-type-limits -Wno-array-bounds -Wno-unknown-pragmas -Wno-sign-compare -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-unused-result -Wno-strict-overflow -Wno-strict-aliasing -Wno-error=deprecated-declarations -Wno-stringop-overflow -Wno-error=pedantic -Wno-error=redundant-decls -Wno-error=old-style-cast -faligned-new -Wno-unused-but-set-variable -Wno-maybe-uninitialized -Wno-stringop-overflow
–   Build type            : Release
–   Compile definitions   : ONNX_NAMESPACE=onnx_torch;MAGMA_V2;USE_C11_ATOMICS=1;TH_BLAS_MKL;HAVE_MMAP=1;_FILE_OFFSET_BITS=64;HAVE_SHM_OPEN=1;HAVE_SHM_UNLINK=1;HAVE_MALLOC_USABLE_SIZE=1
–   CMAKE_PREFIX_PATH     : /home/simon/anaconda3/lib/python3.7/site-packages
–   CMAKE_INSTALL_PREFIX  : /home/simon/Desktop/pytorch-scripts-1.0rc1/pytorch/torch/lib/tmp_install
–   TORCH_VERSION         : 1.0.0
–   CAFFE2_VERSION        : 1.0.0
–   BUILD_ATEN_MOBILE     : OFF
–   BUILD_BINARY          : OFF
–   BUILD_CUSTOM_PROTOBUF : ON
–     Link local protobuf : ON
–   BUILD_DOCS            : OFF
–   BUILD_PYTHON          : ON
–     Python version      : 3.7
–     Python executable   : /home/simon/anaconda3/bin/python
–     Pythonlibs version  : 3.7.0
–     Python library      : /home/simon/anaconda3/lib/python3.7
–     Python includes     : /home/simon/anaconda3/include/python3.7m
–     Python site-packages: lib/python3.7/site-packages
–   BUILD_CAFFE2_OPS      : ON
–   BUILD_SHARED_LIBS     : ON
–   BUILD_TEST            : ON
–   USE_ASAN              : OFF
–   USE_CUDA              : 1
–     CUDA static link    : 0
–     USE_CUDNN           : ON
–     CUDA version        : 10.0
–     cuDNN version       : 7.3.1
–     CUDA root directory : /usr/local/cuda
–     CUDA library        : /usr/lib/x86_64-linux-gnu/libcuda.so
–     cudart library      : /usr/local/cuda/lib64/libcudart_static.a;-pthread;dl;/usr/lib/x86_64-linux-gnu/librt.so
–     cublas library      : /usr/local/cuda/lib64/libcublas.so
–     cufft library       : /usr/local/cuda/lib64/libcufft.so
–     curand library      : /usr/local/cuda/lib64/libcurand.so
–     cuDNN library       : /usr/local/cuda/lib64/libcudnn.so.7
–     nvrtc               : /usr/local/cuda/lib64/libnvrtc.so
–     CUDA include path   : /usr/local/cuda/include
–     NVCC executable     : /usr/local/cuda/bin/nvcc
–     CUDA host compiler  : /usr/bin/cc
–     USE_TENSORRT        : OFF
–   USE_ROCM              : OFF
–   USE_EIGEN_FOR_BLAS    :
–   USE_FFMPEG            : OFF
–   USE_GFLAGS            : OFF
–   USE_GLOG              : OFF
–   USE_LEVELDB           : OFF
–   USE_LITE_PROTO        : OFF
–   USE_LMDB              : OFF
–   USE_METAL             : OFF
–   USE_MKL               :
–   USE_MOBILE_OPENGL     : OFF
–   USE_NCCL              : ON
–     USE_SYSTEM_NCCL     : ON
–   USE_NERVANA_GPU       : OFF
–   USE_NNPACK            : 1
–   USE_OBSERVERS         : ON
–   USE_OPENCL            : OFF
–   USE_OPENCV            : OFF
–   USE_OPENMP            : OFF
–   USE_PROF              : OFF
–   USE_REDIS             : OFF
–   USE_ROCKSDB           : OFF
–   USE_ZMQ               : OFF
–   USE_DISTRIBUTED       : ON
–     USE_MPI             : OFF
–     USE_GLOO            : ON
–     USE_GLOO_IBVERBS    : OFF
–   Public Dependencies  : Threads::Threads;caffe2::mkl
–   Private Dependencies : nnpack;cpuinfo;gloo;gloo;aten_op_header_gen;onnxifi_loader;rt;gcc_s;gcc;dl
– Configuring done