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An Error occured when using maxpooling  #144

@jingyi-zhang

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@jingyi-zhang

The error information is:

 **heatmap_output = max_pooling(input)**
  File "/home/zhangjingy/anaconda3/envs/image_pc/lib/python3.7/site-packages/torch/nn/modules/module.py", line 541, in __call__
    result = self.forward(*input, **kwargs)
  File "/home/zhangjingy/project/image_pc/tools/../../MinkowskiEngine-master/MinkowskiEngine/MinkowskiPooling.py", line 524, in forward
    input.coords_man)
  File "/home/zhangjingy/project/image_pc/tools/../../MinkowskiEngine-master/MinkowskiEngine/MinkowskiPooling.py", line 84, in forward
    ctx.coords_man.CPPCoordsManager)
ValueError: Reduction size mismatch. out_nrows: 70309, num_unique_out_map: 1

The input of max_pooling is:

2020-05-26 16-36-01 的屏幕截图

I initialized maxpooling like:
from MinkowskiEngine import MinkowskiMaxPooling as Max_Pooling max_pooling = Max_Pooling(kernel_size=3, stride=1, dimension=3)

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