conv=ConvolutionLayer[3,{3},(*"Stride"->3,*)"Input"->9]​​(*o1=k11i1+k12i2+k13i3,​​o2=k21i4+k22i5+k23i6,​​o3=k31i7+k32i8+k33i9*)
ConvolutionLayer
:Inferred inconsistent value for input size.
Out[]=
$Failed