text: #include <cmath>
  #include <cstdlib>
  #include <cstring>
  #include <vector>
  
  #include "gtest/gtest.h"
  
  #include "caffe/blob.hpp"
  #include "caffe/common.hpp"
  #include "caffe/filler.hpp"
  #include "caffe/layers/smooth_L1_loss_layer.hpp"
  
  #include "caffe/test/test_caffe_main.hpp"
  #include "caffe/test/test_gradient_check_util.hpp"
  
  namespace caffe {
  
  typedef ::testing::Types<GPUDevice<float>, GPUDevice<double> > TestDtypesGPU;
  
  template <typename TypeParam>
  class SmoothL1LossLayerTest : public MultiDeviceTest<TypeParam> {
    typedef typename TypeParam::Dtype Dtype;
  
   protected:
    SmoothL1LossLayerTest()
        : blob_bottom_data_(new Blob<Dtype>(10, 5, 1, 1)),
          blob_bottom_label_(new Blob<Dtype>(10, 5, 1, 1)),
          blob_bottom_inside_weights_(new Blob<Dtype>(10, 5, 1, 1)),
          blob_bottom_outside_weights_(new Blob<Dtype>(10, 5, 1, 1)),
          blob_top_loss_(new Blob<Dtype>()) {
      // fill the values
      FillerParameter const_filler_param;
      const_filler_param.set_value(-1.);
      ConstantFiller<Dtype> const_filler(const_filler_param);
      FillerParameter filler_param;
      GaussianFiller<Dtype> filler(filler_param);
  
      filler.Fill(this->blob_bottom_data_);
      blob_bottom_vec_.push_back(blob_bottom_data_);
      filler.Fill(this->blob_bottom_label_);
      blob_bottom_vec_.push_back(blob_bottom_label_);
  
      //const_filler.Fill(this->blob_bottom_inside_weights_);
      filler.Fill(this->blob_bottom_inside_weights_);
      blob_bottom_vec_.push_back(blob_bottom_inside_weights_);
      //const_filler.Fill(this->blob_bottom_outside_weights_);
      filler.Fill(this->blob_bottom_outside_weights_);
      blob_bottom_vec_.push_back(blob_bottom_outside_weights_);
  
      blob_top_vec_.push_back(blob_top_loss_);
    }
    virtual ~SmoothL1LossLayerTest() {
      delete blob_bottom_data_;
      delete blob_bottom_label_;
      delete blob_bottom_inside_weights_;
      delete blob_bottom_outside_weights_;
      delete blob_top_loss_;
    }
  
    Blob<Dtype>* const blob_bottom_data_;
    Blob<Dtype>* const blob_bottom_label_;
    Blob<Dtype>* const blob_bottom_inside_weights_;
    Blob<Dtype>* const blob_bottom_outside_weights_;
    Blob<Dtype>* const blob_top_loss_;
    vector<Blob<Dtype>*> blob_bottom_vec_;
    vector<Blob<Dtype>*> blob_top_vec_;
  };
  
  TYPED_TEST_CASE(SmoothL1LossLayerTest, TestDtypesGPU);
  
  TYPED_TEST(SmoothL1LossLayerTest, TestGradient) {
    typedef typename TypeParam::Dtype Dtype;
    LayerParameter layer_param;
    SmoothL1LossParameter* loss_param =
        layer_param.mutable_smooth_l1_loss_param();
    loss_param->set_sigma(2.4);
  
    const Dtype kLossWeight = 3.7;
    layer_param.add_loss_weight(kLossWeight);
    SmoothL1LossLayer<Dtype> layer(layer_param);
    layer.SetUp(this->blob_bottom_vec_, this->blob_top_vec_);
    GradientChecker<Dtype> checker(1e-2, 1e-2, 1701);
    checker.CheckGradientExhaustive(&layer, this->blob_bottom_vec_,
        this->blob_top_vec_, 0);
    checker.CheckGradientExhaustive(&layer, this->blob_bottom_vec_,
        this->blob_top_vec_, 1);
  }
  
  }  // namespace caffe
  