Add cross entropy layer for pixel classification #2876
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1. Add switch function for switching image dimensions order 2. Add CpuMatrix::backwardSoftmax function 3. Add pixel softmax layer, python wrapper and grad_test
… pixel_softmax_layer
… pixel_softmax_layer
1. Add pixel_cross_entropy_cost layer 2. Add INPUT_MULTI_LABEL type for generating pixel label data in LayerGradUtil.cpp
| @wanghaoshuang as we discussed earlier, I still think there is no need to develop |
| @qingqing01 I implement switch_layer with reshape option in PR#2788 which support for softmax activation. |
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fix Add cross entropy layer for pixel classification #2875