make error

cwq@CWQ:~/PycharmProjects/decord/build$ cmake .. -DUSE_CUDA=ON
-- Found FFMPEG or Libav: /usr/lib/x86_64-linux-gnu/libavformat.so;/usr/lib/x86_64-linux-gnu/libavfilter.so;/usr/lib/x86_64-linux-gnu/libavcodec.so;/usr/lib/x86_64-linux-gnu/libavutil.so, /usr/include/x86_64-linux-gnu
-- The CUDA compiler identification is NVIDIA 10.0.130
-- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc
-- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc -- works
-- Detecting CUDA compiler ABI info
-- Detecting CUDA compiler ABI info - done
FFMPEG_INCLUDE_DIR = /usr/include/x86_64-linux-gnu
FFMPEG_LIBRARIES = /usr/lib/x86_64-linux-gnu/libavformat.so;/usr/lib/x86_64-linux-gnu/libavfilter.so;/usr/lib/x86_64-linux-gnu/libavcodec.so;/usr/lib/x86_64-linux-gnu/libavutil.so
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- Found CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda
-- Found CUDA_CUDA_LIBRARY=/usr/local/cuda/lib64/stubs/libcuda.so
-- Found CUDA_CUDART_LIBRARY=/usr/local/cuda/lib64/libcudart.so
-- Found CUDA_NVRTC_LIBRARY=/usr/local/cuda/lib64/libnvrtc.so
-- Found CUDA_CUDNN_LIBRARY=/usr/local/cuda/lib64/libcudnn.so
-- Found CUDA_CUBLAS_LIBRARY=/usr/local/cuda/lib64/libcublas.so
-- Found CUDA_NVIDIA_ML_LIBRARY=/usr/local/cuda/lib64/stubs/libnvidia-ml.so
-- Found CUDA_NVCUVID_LIBRARY=/usr/lib/x86_64-linux-gnu/libnvcuvid.so
-- Build with CUDA support
-- Configuring done
-- Generating done
-- Build files have been written to: /home/cwq/PycharmProjects/decord/build
cwq@CWQ:~/PycharmProjects/decord/build$ make -j8
Scanning dependencies of target decord
[ 2%] Building CXX object CMakeFiles/decord.dir/src/runtime/cpu_device_api.cc.o
[ 5%] Building CXX object CMakeFiles/decord.dir/src/runtime/module_util.cc.o
[ 8%] Building CXX object CMakeFiles/decord.dir/src/runtime/ndarray.cc.o
[ 11%] Building CXX object CMakeFiles/decord.dir/src/runtime/c_runtime_api.cc.o
[ 13%] Building CXX object CMakeFiles/decord.dir/src/runtime/registry.cc.o
[ 16%] Building CXX object CMakeFiles/decord.dir/src/runtime/file_util.cc.o
[ 19%] Building CXX object CMakeFiles/decord.dir/src/runtime/module.cc.o
[ 22%] Building CXX object CMakeFiles/decord.dir/src/runtime/dso_module.cc.o
[ 25%] Building CXX object CMakeFiles/decord.dir/src/runtime/str_util.cc.o
[ 27%] Building CXX object CMakeFiles/decord.dir/src/runtime/system_lib_module.cc.o
[ 30%] Building CXX object CMakeFiles/decord.dir/src/runtime/thread_pool.cc.o
[ 33%] Building CXX object CMakeFiles/decord.dir/src/runtime/threading_backend.cc.o
[ 36%] Building CXX object CMakeFiles/decord.dir/src/video/logging.cc.o
[ 38%] Building CXX object CMakeFiles/decord.dir/src/runtime/workspace_pool.cc.o
[ 41%] Building CXX object CMakeFiles/decord.dir/src/video/storage_pool.cc.o
[ 44%] Building CXX object CMakeFiles/decord.dir/src/video/video_interface.cc.o
[ 47%] Building CXX object CMakeFiles/decord.dir/src/video/video_loader.cc.o
[ 50%] Building CXX object CMakeFiles/decord.dir/src/video/video_reader.cc.o
[ 52%] Building CXX object CMakeFiles/decord.dir/src/sampler/random_file_order_sampler.cc.o
[ 55%] Building CXX object CMakeFiles/decord.dir/src/sampler/random_sampler.cc.o
[ 58%] Building CXX object CMakeFiles/decord.dir/src/sampler/smart_random_sampler.cc.o
[ 61%] Building CXX object CMakeFiles/decord.dir/src/sampler/sequential_sampler.cc.o
[ 63%] Building CXX object CMakeFiles/decord.dir/src/video/ffmpeg/filter_graph.cc.o
[ 66%] Building CXX object CMakeFiles/decord.dir/src/video/ffmpeg/threaded_decoder.cc.o
[ 69%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_context.cc.o
[ 72%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_decoder_impl.cc.o
[ 75%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_mapped_frame.cc.o
[ 77%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_parser.cc.o
[ 80%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_stream.cc.o
[ 83%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_texture.cc.o
[ 86%] Building CXX object CMakeFiles/decord.dir/src/video/nvcodec/cuda_threaded_decoder.cc.o
[ 88%] Building CXX object CMakeFiles/decord.dir/src/runtime/cuda/cuda_device_api.cc.o
[ 91%] Building CXX object CMakeFiles/decord.dir/src/runtime/cuda/cuda_module.cc.o
[ 94%] Building CUDA object CMakeFiles/decord.dir/src/improc/improc.cu.o
[ 97%] Linking CUDA device code CMakeFiles/decord.dir/cmake_device_link.o
[100%] Linking CXX shared library libdecord.so
[100%] Built target decord

>>> import decord as de
>>> ctx = de.gpu(0)
>>> shape = (2, 480, 640, 3)
>>> videos = ['example/Javelin_standing_throw_drill.mkv', 'example/flipping_a_pancake.mkv']
>>> interval = 20
>>> skip = 50
>>> vl = de.VideoLoader(videos, ctx=ctx, shape=shape, interval=interval, skip=skip, shuffle=0)

Traceback (most recent call last):
File "", line 1, in
File "/home/cwq/.local/lib/python3.6/site-packages/decord/video_loader.py", line 32, in __init__
uri, device_types, device_ids, shape[0], shape[1], shape[2], shape[3], interval, skip, shuffle, prefetch)
File "/home/cwq/.local/lib/python3.6/site-packages/decord/_ffi/_ctypes/function.py", line 175, in __call__
ctypes.byref(ret_val), ctypes.byref(ret_tcode)))
File "/home/cwq/.local/lib/python3.6/site-packages/decord/_ffi/base.py", line 62, in check_call
raise DECORDError(py_str(_LIB.DECORDGetLastError()))
decord._ffi.base.DECORDError: [15:55:25] /io/decord/src/video/video_reader.cc:106: CUDA not enabled. Requested context GPU(0).

need your help！