Caffe-GPU compilation problem: nvcc fatal : Unsupported gpu architecture 'compute_20'

environment:

Ubuntu 16.04 

OpenCV 3.3

Miracles 9.0

compilation problem

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1. NVCC src/caffe/layers/bnll_layer.cu  
2. nvcc fatal   : Unsupported gpu architecture 'compute_20'  
3. Makefile:594: recipe for target '.build_release/cuda/src/caffe/layers/bnll_layer.o' failed  
4. make: *** [.build_release/cuda/src/caffe/layers/bnll_layer.o] Error 1  
5. make: *** Waiting for unfinished jobs....  

Take a closer look at the CUDA_ARCH setting in Makefile.config is not set as specified:

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1. # CUDA architecture setting: going with all of them.  
2. # For CUDA <6.0, comment the *_50 through *_61 lines for compatibility.   
3. # For CUDA <8.0, comment the *_60 and *_61 lines for compatibility.   
4. # For CUDA >= 9.0, comment the *_20 and *_21 lines for compatibility.  
5. CUDA_ARCH := -gencode arch=compute_20,code=sm_20 \  
6.                 -gencode arch=compute_20,code=sm_21 \  
7.                 -gencode arch=compute_30,code=sm_30 \  
8.                 -gencode arch=compute_35,code=sm_35 \  
9.                 -gencode arch=compute_50,code=sm_50 \  
10.                 -gencode arch=compute_52,code=sm_52 \  
11.                 -gencode arch=compute_60,code=sm_60 \  
12.                 -gencode arch=compute_61,code=sm_61 \  
13.                 -gencode arch=compute_61,code=compute_61  

Because I installed CUDA9.0, I can delete the following two lines

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1. -gencode arch=compute_20,code=sm_20 \  
2. -gencode arch=compute_20,code=sm_21 \