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Diffstat (limited to 'compiler/nnc/utils/caffe_model_maker/Pyloss.py')
-rwxr-xr-x | compiler/nnc/utils/caffe_model_maker/Pyloss.py | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/compiler/nnc/utils/caffe_model_maker/Pyloss.py b/compiler/nnc/utils/caffe_model_maker/Pyloss.py new file mode 100755 index 000000000..e3f781759 --- /dev/null +++ b/compiler/nnc/utils/caffe_model_maker/Pyloss.py @@ -0,0 +1,83 @@ +""" +COPYRIGHT + +All contributions by the University of California: +Copyright (c) 2014-2017 The Regents of the University of California (Regents) +All rights reserved. + +All other contributions: +Copyright (c) 2014-2017, the respective contributors +All rights reserved. + +Caffe uses a shared copyright model: each contributor holds copyright over +their contributions to Caffe. The project versioning records all such +contribution and copyright details. If a contributor wants to further mark +their specific copyright on a particular contribution, they should indicate +their copyright solely in the commit message of the change when it is +committed. + +LICENSE + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +1. Redistributions of source code must retain the above copyright notice, this + list of conditions and the following disclaimer. +2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR +ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +CONTRIBUTION AGREEMENT + +By contributing to the BVLC/caffe repository through pull-request, comment, +or otherwise, the contributor releases their content to the +license and copyright terms herein. +""" +import caffe +import numpy as np + + +class EuclideanLossLayer(caffe.Layer): + """ + Compute the Euclidean Loss in the same manner as the C++ EuclideanLossLayer + to demonstrate the class interface for developing layers in Python. + """ + + def setup(self, bottom, top): + # check input pair + if len(bottom) != 2: + raise Exception("Need two inputs to compute distance.") + + def reshape(self, bottom, top): + # check input dimensions match + if bottom[0].count != bottom[1].count: + raise Exception("Inputs must have the same dimension.") + # difference is shape of inputs + self.diff = np.zeros_like(bottom[0].data, dtype=np.float32) + # loss output is scalar + top[0].reshape(1) + + def forward(self, bottom, top): + self.diff[...] = bottom[0].data - bottom[1].data + top[0].data[...] = np.sum(self.diff**2) / bottom[0].num / 2. + + def backward(self, top, propagate_down, bottom): + for i in range(2): + if not propagate_down[i]: + continue + if i == 0: + sign = 1 + else: + sign = -1 + bottom[i].diff[...] = sign * self.diff / bottom[i].num |