12345678910111213141516171819202122232425262728293031323334 |
- // representation of a state used while searching for the best split
- typedef struct {
- real leftGradientSum, rightGradientSum;
- real leftHessianSum, rightHessianSum;
- real lossInParent;
- long nExampleInLeftBranch, nExampleInRightBranch;
- real *grad_data, *hessian_data;
- } nn_(GBState);
-
- // representation for the best state found for a given feature
- typedef struct {
- nn_(GBState) state;
- real gain;
- long feature_id;
- real feature_value;
- int valid_state;
- } nn_(GBBestState);
-
- // full data that must be initialized before calling the optimizer
- typedef struct {
- // *_index represent positions on the lua stack
- int dataset_index;
- int splitInfo_index;
- int input_index;
- // position of the dataset's function to return the samples ordered for a given feature
- int getSortedFeature_index;
-
- // samples that this node has to evaluate
- THLongTensor *exampleIds;
-
- // cached gradient and hessian for all data
- THTensor *grad;
- THTensor *hess;
- } nn_(GBInitialization);
|