Method Backward_cpu

src/caffe/layers/absval_layer.cpp:25–35

template <typename Dtype>
void AbsValLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
    const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) {
  const int count = top[0]->count();
  const Dtype* top_diff = top[0]->cpu_diff();
  if (propagate_down[0]) {
    const Dtype* bottom_data = bottom[0]->cpu_data();
    Dtype* bottom_diff = bottom[0]->mutable_cpu_diff();
    caffe_cpu_sign(count, bottom_data, bottom_diff);
    caffe_mul(count, bottom_diff, top_diff, bottom_diff);
  }
}

#ifdef CPU_ONLY
STUB_GPU(AbsValLayer);