convolution操作
Convolution
For GPU runtime, when the number of groups is greater than 1, the number of output channels must be a multiple of 4 * the number of groups. For example, with 2 groups, the number of output channels must be a multiple of 8 (4*2=8).
卷积操作的GPU模式，如果groups的数值大于1，那么网络层的输出通道数必须是groups数4倍的倍数；
deconvolution操作
Deconvolution
1）For GPU and CPU runtime, the number of output channels (i.e. number of filters) can be any value (not necessarily a multiple of 4).
2）For GPU runtime the following limitations apply:
number of packed input channels * number output channels <= MaxPerGPUSize
Filter size-X * Filter size-Y <= MaxPerGPUSize
Stride <= filter size
3）For DSP runtime, deconvolutions with stride > 4 are not fully optimized.
Caffe parameter limitation: dilation and rectangular filters are not supported
对于反卷积操作，
