different results produced by CPU and GPU mode

facebookarchive / C3D

C3D is a modified version of BVLC caffe to support 3D ConvNets.

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Closed mmchen88 closed 5 years ago

mmchen88 commented 5 years ago

I use the same UCF101 model, same data ,but get different results when using CPU mode and GPU mode.

dutran commented 5 years ago

how much different? is it about machine epsilon? CPU and GPU may have different floating point precison.

mmchen88 commented 5 years ago

I found the reason, CudnnReluLayer in GPU mode only process 4D tensors. When the tensor is 5D, the code must be modified.