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slice_layer.cpp
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141 lines (132 loc) · 4.65 KB
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#include <algorithm>
#include <vector>
#include "caffe/layer.hpp"
#include "caffe/util/math_functions.hpp"
#include "caffe/vision_layers.hpp"
namespace caffe {
template <typename Dtype>
void SliceLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
const SliceParameter& slice_param = this->layer_param_.slice_param();
slice_dim_ = slice_param.slice_dim();
CHECK_GE(slice_dim_, 0);
CHECK_LE(slice_dim_, 1) << "Can only slice num and channels";
slice_point_.clear();
std::copy(slice_param.slice_point().begin(),
slice_param.slice_point().end(),
std::back_inserter(slice_point_));
}
template <typename Dtype>
void SliceLayer<Dtype>::Reshape(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
count_ = 0;
num_ = bottom[0]->num();
channels_ = bottom[0]->channels();
height_ = bottom[0]->height();
width_ = bottom[0]->width();
if (slice_point_.size() != 0) {
CHECK_EQ(slice_point_.size(), top->size() - 1);
if (slice_dim_ == 0) {
CHECK_LE(top->size(), num_);
} else {
CHECK_LE(top->size(), channels_);
}
int prev = 0;
vector<int> slices;
for (int i = 0; i < slice_point_.size(); ++i) {
CHECK_GT(slice_point_[i], prev);
slices.push_back(slice_point_[i] - prev);
prev = slice_point_[i];
}
if (slice_dim_ == 0) {
slices.push_back(num_ - prev);
for (int i = 0; i < top->size(); ++i) {
(*top)[i]->Reshape(slices[i], channels_, height_, width_);
count_ += (*top)[i]->count();
}
} else {
slices.push_back(channels_ - prev);
for (int i = 0; i < top->size(); ++i) {
(*top)[i]->Reshape(num_, slices[i], height_, width_);
count_ += (*top)[i]->count();
}
}
} else {
if (slice_dim_ == 0) {
CHECK_EQ(num_ % top->size(), 0)
<< "Number of top blobs (" << top->size() << ") "
<< "should evenly divide input num ( " << num_ << ")";
num_ = num_ / top->size();
} else {
CHECK_EQ(channels_ % top->size(), 0)
<< "Number of top blobs (" << top->size() << ") "
<< "should evenly divide input channels ( " << channels_ << ")";
channels_ = channels_ / top->size();
}
for (int i = 0; i < top->size(); ++i) {
(*top)[i]->Reshape(num_, channels_, height_, width_);
count_ += (*top)[i]->count();
}
}
CHECK_EQ(count_, bottom[0]->count());
}
template <typename Dtype>
void SliceLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
const Dtype* bottom_data = bottom[0]->mutable_cpu_data();
if (slice_dim_ == 0) {
int offset_num = 0;
for (int i = 0; i < top->size(); ++i) {
Blob<Dtype>* blob = (*top)[i];
Dtype* top_data = blob->mutable_cpu_data();
caffe_copy(blob->count(), bottom_data + bottom[0]->offset(offset_num),
top_data);
offset_num += blob->num();
}
} else if (slice_dim_ == 1) {
int offset_channel = 0;
for (int i = 0; i < top->size(); ++i) {
Blob<Dtype>* blob = (*top)[i];
Dtype* top_data = blob->mutable_cpu_data();
const int num_elem = blob->channels() * blob->height() * blob->width();
for (int n = 0; n < num_; ++n) {
caffe_copy(num_elem, bottom_data + bottom[0]->offset(n, offset_channel),
top_data + blob->offset(n));
}
offset_channel += blob->channels();
}
} // slice_dim_ is guaranteed to be 0 or 1 by SetUp.
}
template <typename Dtype>
void SliceLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, vector<Blob<Dtype>*>* bottom) {
if (!propagate_down[0]) { return; }
Dtype* bottom_diff = (*bottom)[0]->mutable_cpu_diff();
if (slice_dim_ == 0) {
int offset_num = 0;
for (int i = 0; i < top.size(); ++i) {
Blob<Dtype>* blob = top[i];
const Dtype* top_diff = blob->cpu_diff();
caffe_copy(blob->count(), top_diff,
bottom_diff + (*bottom)[0]->offset(offset_num));
offset_num += blob->num();
}
} else if (slice_dim_ == 1) {
int offset_channel = 0;
for (int i = 0; i < top.size(); ++i) {
Blob<Dtype>* blob = top[i];
const Dtype* top_diff = blob->cpu_diff();
const int num_elem = blob->channels() * blob->height() * blob->width();
for (int n = 0; n < num_; ++n) {
caffe_copy(num_elem, top_diff + blob->offset(n),
bottom_diff + (*bottom)[0]->offset(n, offset_channel));
}
offset_channel += blob->channels();
}
} // slice_dim_ is guaranteed to be 0 or 1 by SetUp.
}
#ifdef CPU_ONLY
STUB_GPU(SliceLayer);
#endif
INSTANTIATE_CLASS(SliceLayer);
} // namespace caffe