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Add C document to sphinx, fix arrow. (#8300)

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- Group C API.
- Add C API sphinx doc.
- Consistent use of `OptionalArg` and the parameter name `config`.
- Remove call to deprecated functions in demo.
- Fix some formatting errors.
- Add links to c examples in the document (only visible with doxygen pages)
- Fix arrow.
This commit is contained in:
Jiaming Yuan
2022-10-05 09:52:15 +08:00
committed by GitHub
parent b2bbf49015
commit 97c3a80a34
17 changed files with 458 additions and 297 deletions
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41
demo/c-api/basic/c-api-demo.c
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@@ -18,7 +18,7 @@ if (err != 0) { \
} \
}
int main(int argc, char** argv) {
int main() {
int silent = 0;
int use_gpu = 0; // set to 1 to use the GPU for training
@@ -67,10 +67,21 @@ int main(int argc, char** argv) {
// predict
bst_ulong out_len = 0;
const float* out_result = NULL;
int n_print = 10;
safe_xgboost(XGBoosterPredict(booster, dtest, 0, 0, 0, &out_len, &out_result));
/* Run prediction with DMatrix object. */
char const config[] =
"{\"training\": false, \"type\": 0, "
"\"iteration_begin\": 0, \"iteration_end\": 0, \"strict_shape\": false}";
/* Shape of output prediction */
uint64_t const* out_shape;
/* Dimension of output prediction */
uint64_t out_dim;
/* Pointer to a thread local contigious array, assigned in prediction function. */
float const* out_result = NULL;
safe_xgboost(
XGBoosterPredictFromDMatrix(booster, dtest, config, &out_shape, &out_dim, &out_result));
printf("y_pred: ");
for (int i = 0; i < n_print; ++i) {
printf("%1.4f ", out_result[i]);
@@ -98,12 +109,12 @@ int main(int argc, char** argv) {
DMatrixHandle dmat;
safe_xgboost(XGDMatrixCreateFromMat(values, 1, 127, 0.0, &dmat));
bst_ulong out_len = 0;
const float* out_result = NULL;
safe_xgboost(XGBoosterPredict(booster, dmat, 0, 0, 0, &out_len,
&out_result));
assert(out_len == 1);
safe_xgboost(
XGBoosterPredictFromDMatrix(booster, dmat, config, &out_shape, &out_dim, &out_result));
assert(out_dim == 1);
assert(out_shape[0] == 1);
printf("%1.4f \n", out_result[0]);
safe_xgboost(XGDMatrixFree(dmat));
@@ -122,12 +133,12 @@ int main(int argc, char** argv) {
safe_xgboost(XGDMatrixCreateFromCSREx(indptr, indices, data, 2, 22, 127,
&dmat));
bst_ulong out_len = 0;
const float* out_result = NULL;
safe_xgboost(XGBoosterPredict(booster, dmat, 0, 0, 0, &out_len,
&out_result));
assert(out_len == 1);
safe_xgboost(
XGBoosterPredictFromDMatrix(booster, dmat, config, &out_shape, &out_dim, &out_result));
assert(out_dim == 1);
assert(out_shape[0] == 1);
printf("%1.4f \n", out_result[0]);
safe_xgboost(XGDMatrixFree(dmat));
@@ -154,12 +165,12 @@ int main(int argc, char** argv) {
safe_xgboost(XGDMatrixCreateFromCSCEx(col_ptr, indices, data, 128, 22, 1,
&dmat));
bst_ulong out_len = 0;
const float* out_result = NULL;
safe_xgboost(XGBoosterPredict(booster, dmat, 0, 0, 0, &out_len,
&out_result));
assert(out_len == 1);
safe_xgboost(
XGBoosterPredictFromDMatrix(booster, dmat, config, &out_shape, &out_dim, &out_result));
assert(out_dim == 1);
assert(out_shape[0] == 1);
printf("%1.4f \n", out_result[0]);
safe_xgboost(XGDMatrixFree(dmat));