Error: Unknown CUDA Architecture Name 2.1(2.0) in CUDA_SELECT_NVCC_ARCH_FLAGS

[bbhushan-ds]

I already have cuda 7.5 installed in ubuntu 14.04 which is creating the issue as described below. I am installing torch 7 described in this url http://torch.ch/docs/getting-started.html

./install.sh file breaks up while installing. Could any body help us out in this issue.

Error:

Found CUDA on your machine. Installing CUDA packages
Warning: unmatched variable LUALIB
cmake -E make_directory build && cd build && cmake .. -DLUALIB= -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS} -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="/home/bb/torch/install/bin/.." -DCMAKE_INSTALL_PREFIX="/home/bb/torch/install/lib/luarocks/rocks/cutorch/scm-1" && make -j$(getconf _NPROCESSORS_ONLN) install

-- Found Torch7 in /home/bb/torch/install
-- MAGMA not found. Compiling without MAGMA support
-- Autodetected CUDA architecture(s):
CMake Error at /home/bb/torch/install/share/cmake/torch/FindCUDA/select_compute_arch.cmake:142 (message):
Unknown CUDA Architecture Name 2.1(2.0) in CUDA_SELECT_NVCC_ARCH_FLAGS
Call Stack (most recent call first):
lib/THC/CMakeLists.txt:71 (CUDA_SELECT_NVCC_ARCH_FLAGS)

CMake Error at /home/bb/torch/install/share/cmake/torch/FindCUDA/select_compute_arch.cmake:146 (message):
arch_bin wasn't set for some reason
Call Stack (most recent call first):
lib/THC/CMakeLists.txt:71 (CUDA_SELECT_NVCC_ARCH_FLAGS)

-- got cuda version 7.5
-- Found CUDA with FP16 support, compiling with torch.CudaHalfTensor
-- Configuring incomplete, errors occurred!
See also "/home/bb/torch/extra/cutorch/build/CMakeFiles/CMakeOutput.log".

Error: Build error: Failed building.
bb@bb:~/torch$