Function Net_before_backward

python/caffe/_caffe.cpp:326–328

  net->add_after_forward(new NetCallback<Dtype>(run));
}
void Net_before_backward(Net<Dtype>* net, bp::object run) {
  net->add_before_backward(new NetCallback<Dtype>(run));
}
void Net_after_backward(Net<Dtype>* net, bp::object run) {
  net->add_after_backward(new NetCallback<Dtype>(run));
}