text: #ifndef COST_LAYER_H
  #define COST_LAYER_H
  #include "layer.h"
  #include "network.h"
  
  typedef layer cost_layer;
  
  COST_TYPE get_cost_type(char *s);
  char *get_cost_string(COST_TYPE a);
  cost_layer make_cost_layer(int batch, int inputs, COST_TYPE type, float scale);
  void forward_cost_layer(const cost_layer l, network_state state);
  void backward_cost_layer(const cost_layer l, network_state state);
  void resize_cost_layer(cost_layer *l, int inputs);
  
  #ifdef WITH_CUDA
  void forward_cost_layer_gpu(cost_layer l, network_state state);
  void backward_cost_layer_gpu(const cost_layer l, network_state state);
  #endif
  
  #endif
  