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Added a Reshape layer for copying-free modification of blob dimensions.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,113 @@ | ||
| #include <vector> | ||
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| #include "caffe/common_layers.hpp" | ||
| #include "caffe/layer.hpp" | ||
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| namespace caffe { | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom, | ||
| const vector<Blob<Dtype>*>& top) { | ||
| CHECK_EQ(bottom.size(), 1) << "Reshape Layer takes a single blob as input."; | ||
| CHECK_EQ(top.size(), 1) << "Reshape Layer takes a single blob as output."; | ||
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| num_out = this->layer_param_.reshape_param().num(); | ||
| // Dimensions set to 0 (either by default or explicitly) will be copied from | ||
| // the bottom layer. | ||
| if (num_out == 0) { | ||
| num_out = bottom[0]->num(); | ||
| } | ||
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| channels_out = this->layer_param_.reshape_param().channels(); | ||
| if (channels_out == 0) { | ||
| channels_out = bottom[0]->channels(); | ||
| } | ||
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| width_out = this->layer_param_.reshape_param().width(); | ||
| if (width_out == 0) { | ||
| width_out = bottom[0]->width(); | ||
| } | ||
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| height_out = this->layer_param_.reshape_param().height(); | ||
| if (height_out == 0) { | ||
| height_out = bottom[0]->height(); | ||
| } | ||
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| FillInSingleUnspecifiedDimension(bottom[0]->count()); | ||
| } | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::Reshape(const vector<Blob<Dtype>*>& bottom, | ||
| const vector<Blob<Dtype>*>& top) { | ||
| top[0]->Reshape(num_out, channels_out, height_out, width_out); | ||
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| const size_t out_count = num_out * channels_out * height_out * width_out; | ||
| CHECK_EQ(out_count, bottom[0]->count()) << | ||
| "Bottom layer count isn't equal to predicted; output layer size is " << | ||
| num_out << "x" << channels_out << "x" << height_out << "x" << width_out; | ||
| } | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom, | ||
| const vector<Blob<Dtype>*>& top) { | ||
| top[0]->ShareData(*bottom[0]); | ||
| } | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top, | ||
| const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) { | ||
| bottom[0]->ShareDiff(*top[0]); | ||
| } | ||
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| /** | ||
| * @brief Fill in a single dimension left unspecified. | ||
| * | ||
| * If a dimension is set to -1, it will be filled in with a value inferred from | ||
| * the count of the bottom layer (if the product of the nonzero dimensions is a | ||
| * divisor of the count). | ||
| * | ||
| * @param bottom_count Count of the bottom layer. | ||
| */ | ||
| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::FillInSingleUnspecifiedDimension(int bottom_count) { | ||
| int* const dimensions[] = {&num_out, &channels_out, &width_out, &height_out}; | ||
| const size_t N_DIMENSIONS = 4; | ||
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| // How many -1 dimensions do we have. | ||
| int n_unspecified = 0; | ||
| // Product of the remaining dimensions. | ||
| int product_without_unspecified_dim = 1; | ||
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| for (size_t i = 0; i < N_DIMENSIONS; i++) { | ||
| if (*(dimensions[i]) == -1) { | ||
| n_unspecified++; | ||
| } else { | ||
| product_without_unspecified_dim *= *(dimensions[i]); | ||
| } | ||
| } | ||
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| if (n_unspecified == 0) { | ||
| // Everything is filled out, nothing to do. | ||
| return; | ||
| } | ||
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| CHECK_EQ(n_unspecified, 1) << "Only one dimension can be set -1."; | ||
| CHECK_EQ(bottom_count % product_without_unspecified_dim, 0) << | ||
| "Bottom layer count " << bottom_count << " not divisible by product " << | ||
| product_without_unspecified_dim; | ||
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| // Fill up the one remaining dimension. | ||
| for (size_t i = 0; i < N_DIMENSIONS; i++) { | ||
| if (*(dimensions[i]) == -1) { | ||
| *(dimensions[i]) = bottom_count / product_without_unspecified_dim; | ||
| } | ||
| } | ||
| } | ||
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| #ifdef CPU_ONLY | ||
| STUB_GPU(ReshapeLayer); | ||
| #endif | ||
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| INSTANTIATE_CLASS(ReshapeLayer); | ||
| REGISTER_LAYER_CLASS(RESHAPE, ReshapeLayer); | ||
| } // namespace caffe |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| #include <vector> | ||
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| #include "caffe/common_layers.hpp" | ||
| #include "caffe/layer.hpp" | ||
| #include "caffe/util/math_functions.hpp" | ||
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| namespace caffe { | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom, | ||
| const vector<Blob<Dtype>*>& top) { | ||
| top[0]->ShareData(*bottom[0]); | ||
| } | ||
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| template <typename Dtype> | ||
| void ReshapeLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top, | ||
| const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) { | ||
| bottom[0]->ShareDiff(*top[0]); | ||
| } | ||
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| INSTANTIATE_LAYER_GPU_FUNCS(ReshapeLayer); | ||
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| } // namespace caffe |
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