[GitHub] mafhha opened a new issue #7774: 3d convolution gives zero output

[git]

mafhha opened a new issue #7774: 3d convolution gives zero output
URL: https://github.com/apache/incubator-mxnet/issues/7774
 
 
   When using mxnet 3d Convolution layer, the output is all zeros. 
   
   
   ```
   import mxnet as mx
   data = mx.nd.arange(24).reshape((2,1,2,2,3))
   
   x = mx.sym.Variable('data', shape=(2,1,2,2,3))
   conv3D = mx.sym.Convolution(data=x, kernel=(2, 2, 3), pad=(1, 1, 1), 
num_filter=2)
   
   conv3D_ex = conv3D.simple_bind(mx.gpu(), arg_dicts={'data':data})
   args = conv3D_ex.arg_dict
   
   
   init = mx.init.Uniform(scale=0.01)
   for name, arr in args.items():
       if name not in ['data']:
           init(name, arr)
   
   args['data']=data
   
   print args
   print conv3D_ex.forward()
   
   {'data': 
   [[[[[  0.   1.   2.]
       [  3.   4.   5.]]
   
      [[  6.   7.   8.]
       [  9.  10.  11.]]]]
   
   
   
    [[[[ 12.  13.  14.]
       [ 15.  16.  17.]]
   
      [[ 18.  19.  20.]
       [ 21.  22.  23.]]]]]
   <NDArray 2x1x2x2x3 @cpu(0)>, 'convolution0_weight': 
   [[[[[ 0.00480439  0.00841988 -0.00921959]
       [ 0.00937926  0.00850281 -0.001073  ]]
   
      [[ 0.00334638 -0.00780139 -0.00059563]
       [ 0.00026387  0.0055235  -0.00410469]]]]
   
   
   
    [[[[ 0.00428019 -0.00282996  0.00362837]
       [-0.0041597  -0.00361182  0.00621827]]
   
      [[-0.00691776 -0.00109668 -0.00584008]
       [ 0.00221961 -0.00385449 -0.00168849]]]]]
   <NDArray 2x1x2x2x3 @gpu(0)>, 'convolution0_bias': 
   [ 0.  0.]
   <NDArray 2 @gpu(0)>}
   [
   [[[[[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]]
   
   
     [[[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]]]
   
   
   
    [[[[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]]
   
   
     [[[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]
   
      [[ 0.  0.  0.]
       [ 0.  0.  0.]
       [ 0.  0.  0.]]]]]
   <NDArray 2x2x3x3x3 @gpu(0)>]
   ```
 
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