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// Copyright 2014 BVLC and contributors.
#include <cmath>
#include <cstring>
#include <vector>
#include "gtest/gtest.h"
#include "caffe/blob.hpp"
#include "caffe/common.hpp"
#include "caffe/filler.hpp"
#include "caffe/vision_layers.hpp"
#include "caffe/test/test_gradient_check_util.hpp"
#include "caffe/test/test_caffe_main.hpp"
namespace caffe {
template <typename TypeParam>
class SoftmaxLayerTest : public MultiDeviceTest<TypeParam> {
typedef typename TypeParam::Dtype Dtype;
protected:
SoftmaxLayerTest()
: blob_bottom_(new Blob<Dtype>(2, 10, 1, 1)),
blob_top_(new Blob<Dtype>()) {
// fill the values
FillerParameter filler_param;
GaussianFiller<Dtype> filler(filler_param);
filler.Fill(this->blob_bottom_);
blob_bottom_vec_.push_back(blob_bottom_);
blob_top_vec_.push_back(blob_top_);
}
virtual ~SoftmaxLayerTest() { delete blob_bottom_; delete blob_top_; }
Blob<Dtype>* const blob_bottom_;
Blob<Dtype>* const blob_top_;
vector<Blob<Dtype>*> blob_bottom_vec_;
vector<Blob<Dtype>*> blob_top_vec_;
};
TYPED_TEST_CASE(SoftmaxLayerTest, TestDtypesAndDevices);
TYPED_TEST(SoftmaxLayerTest, TestForward) {
typedef typename TypeParam::Dtype Dtype;
LayerParameter layer_param;
SoftmaxLayer<Dtype> layer(layer_param);
layer.SetUp(this->blob_bottom_vec_, &(this->blob_top_vec_));
layer.Forward(this->blob_bottom_vec_, &(this->blob_top_vec_));
// Test sum
for (int i = 0; i < this->blob_bottom_->num(); ++i) {
Dtype sum = 0;
for (int j = 0; j < this->blob_top_->channels(); ++j) {
sum += this->blob_top_->data_at(i, j, 0, 0);
}
EXPECT_GE(sum, 0.999);
EXPECT_LE(sum, 1.001);
}
// Test exact values
for (int i = 0; i < this->blob_bottom_->num(); ++i) {
Dtype scale = 0;
for (int j = 0; j < this->blob_bottom_->channels(); ++j) {
scale += exp(this->blob_bottom_->data_at(i, j, 0, 0));
}
for (int j = 0; j < this->blob_bottom_->channels(); ++j) {
EXPECT_GE(this->blob_top_->data_at(i, j, 0, 0) + 1e-4,
exp(this->blob_bottom_->data_at(i, j, 0, 0)) / scale)
<< "debug: " << i << " " << j;
EXPECT_LE(this->blob_top_->data_at(i, j, 0, 0) - 1e-4,
exp(this->blob_bottom_->data_at(i, j, 0, 0)) / scale)
<< "debug: " << i << " " << j;
}
}
}
TYPED_TEST(SoftmaxLayerTest, TestGradient) {
typedef typename TypeParam::Dtype Dtype;
LayerParameter layer_param;
SoftmaxLayer<Dtype> layer(layer_param);
GradientChecker<Dtype> checker(1e-2, 1e-3);
checker.CheckGradientExhaustive(&layer, &(this->blob_bottom_vec_),
&(this->blob_top_vec_));
}
} // namespace caffe
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