如何构建Catboost C评估库API？

c_wrapper.c:16:13: warning: incompatible pointer types passing 'float (*)[3]' to parameter of type 'const float **' [-wincompatible-pointer-types]
            &floatfeatures, 3,
            ^~~~~~~~~~~~~~
/users/eli/workspace/test_c_api/catboost/catboost/libs/model_interface/c_api.h:151:19: note: passing argument to parameter 'floatfeatures' here
    const float** floatfeatures, size_t floatfeaturessize,
                  ^
c_wrapper.c:17:13: warning: incompatible pointer types passing 'char *(*)[4]' to parameter of type 'const char ***' [-wincompatible-pointer-types]
            &catfeatures, 4,
            ^~~~~~~~~~~~
/users/eli/workspace/test_c_api/catboost/catboost/libs/model_interface/c_api.h:152:19: note: passing argument to parameter 'catfeatures' here
    const char*** catfeatures, size_t catfeaturessize,
                  ^
c_wrapper.c:18:13: warning: incompatible pointer types passing 'double (*)[1]' to parameter of type 'double *' [-wincompatible-pointer-types]
            &result, 1
            ^~~~~~~
/users/eli/workspace/test_c_api/catboost/catboost/libs/model_interface/c_api.h:153:13: note: passing argument to parameter 'result' here
    double* result, size_t resultsize);

解决方案：

1. 我们通过将 modelhandle 变量重新定义为以下方式解决了问题 #1：

modelcalcerhandle *modelhandle = modelcalcercreate();

进行此更改后，可以编译 c 程序，但我们收到了一个新错误：

[1]    6489 segmentation fault  ./program

float floatfeaturesraw[100];
const float *floatfeatures = floatfeaturesraw;
const char *catfeaturesraw[2] = {"1", "2"};
const char **catfeatures = catfeaturesraw;
double resultraw[1];
double *result = resultraw;

if (!CalcModelPredictionSingle(
        modelHandle,
        &floatFeatures, 3,
        &catFeatures, 4,
        result, 1)) //We remove `&`
{
   printf("CalcModelPrediction error message: %s\n", GetErrorString());
}

./ya make -r catboost/libs/model_interface --target-platform clang14-darwin-arm64

#include 
#include 

int main()
{
    float floatfeaturesraw[3] = {0, 89, 1};
    const float *floatfeatures = floatfeaturesraw;
    const char *catfeaturesraw[4] = {"others", "443_Https", "6", "24"};
    const char **catfeatures = catfeaturesraw;
    double resultraw[4];
    double *result = resultraw;

    modelcalcerhandle *modelhandle = modelcalcercreate();
    if (!loadfullmodelfromfile(modelhandle, "catboost_model"))
    {
        printf("loadfullmodelfromfile error message: %s\n", geterrorstring());
    }
    setpredictiontype(modelhandle, 3);
    if (!calcmodelpredictionsingle(
            modelhandle,
            floatfeatures, 3,
            catfeatures, 4,
            result, 4))
    {
        printf("calcmodelprediction error message: %s\n", geterrorstring());
    }
    printf("%f\n", result[0]);
    printf("%f\n", result[1]);
    printf("%f\n", result[2]);
    printf("%f\n", result[3]);
    modelcalcerdelete(modelhandle);
}

GCc -v -o program.out c_code.c -l catboostmodel -i /path/to/catboost/repo/catboost/catboost/libs/model_interface/ -l /path/to/catboost/repo/catboost/catboost/libs/model_interface/

./program.out