本文主要演示Python导出JSON文件，将模型参数保存到JSON文件，然后由C语言调用从JSON读取模型参数，读取具体参数，最后打印输出。
Python 导出隐马尔科夫模型参数
在Python中训练好模型后，将模型参数保存到Python字典中，然后调用json模块的dump函数，将字典整体以JSON格式保存到文件中。
参数导出
Python导出的数据有矩阵，数组，整数与字符串。下面是Python代码。
import numpy as np import os import json import joblib def model_export_test(): para = dict() para['n'] = 2 para['ft'] = 2 para['m'] = [ [ 0.65985107421875, 4.225499739584418, ], [ 0.366943359375, 12.658813626901697, ], ] para['c'] = [ [ 0.011996133774518967, 3.7065230565392455, ], [ 0.018222754001617433, 4.0523744826252015, ], ], para['s'] = [ 0.15384615384615385, 0.07692307692307693, ], para['t'] = [ [ 0.6666666666666666, 0.0, ], [ 0.0, 0.5, ], ], para['ftType'] = 'ft30' para['sTNum'] = 1 para['sTList'] = [1] return para if '__main__' == __name__: para = dict() para['model_num'] = 2 para['model1'] = model_export_test() para['model2'] = model_export_test() f = open(r'E:\\model.ini', 'wt') json.dump(para, f) f.close()
格式转换
由于json.dump导出的参数无换行，即所有数据都在同一行，阅读困难，因此需要根据数据添加换行符。在Python命令行中调用josn.tool完成格式转换。
python -m json.tool model.ini model_re.ini
命令执行过程图，如下。
命令执行结果
命令执行效果
从上图中可以看出，转换格式后，数据很容易阅读。
C语言读取模型参数
调用从cJSON读取JSON文件
调用从JSON中的cJSON_Parse函数读取JSON文件中的参数，cJSON_Parse返回的参数是结构的循环链表。文件读取代码如下。
FILE *f;long len;char *data; int ret = -1; f=fopen(filename,"rb");fseek(f,0,SEEK_END);len=ftell(f);fseek(f,0,SEEK_SET); data=(char*)malloc(len+1);fread(data,1,len,f);fclose(f); /* doit(data); */ char *out;cJSON *json; json=cJSON_Parse(data); printf("json file name:%s \n", filename); printf("type: %d \n", json->type);
参数再提取
cJSON读取的数据不方便直接使用，因此需要做进一步整理，本文是将模型参数提取到模型结构体数组中。
int readHmodelParaFromfile1(char *filename, modelPara1_t *modelPara, int model_num) { FILE *f;long len;char *data; int ret = -1; f=fopen(filename,"rb");fseek(f,0,SEEK_END);len=ftell(f);fseek(f,0,SEEK_SET); data=(char*)malloc(len+1);fread(data,1,len,f);fclose(f); /* doit(data); */ char *out;cJSON *json; json=cJSON_Parse(data); printf("json file name:%s \n", filename); printf("type: %d \n", json->type); int numentries=0; cJSON *child, *child_bf; child = json->child; while (child) numentries++,child=child->next; printf("numentries:%d \n", numentries); if(!json || numentries != json->child->valueint && 0 != strcmp(json->child->string, MODEL_NUM) || model_num < numentries) { printf("model file error !!!!!!!!!\n"); return ret; } child_bf = json->child; int numentries_idx = 1; while(numentries_idx < numentries) { /* out=cJSON_Print(json); cJSON_Delete(json); printf("%s\n",out); free(out); */ child_bf = child_bf->next; child = child_bf->child; getintValueUsingName(child, &modelPara->fNumber, "n"); getintValueUsingName(child, &modelPara->nNumber, "ft"); printf("n:%d f:%d\n\n", modelPara->nNumber, modelPara->fNumber); modelPara->m = malloc(sizeof(double) * modelPara->nNumber * modelPara->fNumber); ret = getMatUsingName(child, modelPara->m, (char *)MODEL_M_NAME, modelPara->nNumber, modelPara->fNumber); printf("%s ret:%d value:%lf\n\n", MODEL_M_NAME, ret, modelPara->m[modelPara->nNumber * modelPara->fNumber - 1]); modelPara->c = malloc(sizeof(double) * modelPara->nNumber * modelPara->fNumber); ret = getMatUsingName(child, modelPara->c, (char *)MODEL_C_NAME, modelPara->nNumber, modelPara->fNumber); printf("%s ret:%d value:%lf\n\n", MODEL_C_NAME, ret, modelPara->c[modelPara->nNumber * modelPara->fNumber - 1]); mat_check_maximum(modelPara->c, modelPara->nNumber, modelPara->fNumber); modelPara->s = malloc(sizeof(double) * modelPara->nNumber); ret = getMatUsingName(child, modelPara->s, (char *)MODEL_S_NAME, 1, modelPara->nNumber); printf("%s ret:%d value:%lf\n\n", MODEL_S_NAME, ret, modelPara->s[modelPara->nNumber - 1]); modelPara->t = malloc(sizeof(double) * modelPara->nNumber * modelPara->nNumber); ret = getMatUsingName(child, modelPara->t, (char *)MODEL_T_NAME, modelPara->nNumber, modelPara->nNumber); printf("%s ret:%d value:%lf\n\n", MODEL_T_NAME, ret, modelPara->t[modelPara->nNumber * modelPara->nNumber - 1]); ret = getintValueUsingName(child, &modelPara->sTNum, "sTNum"); printf("%s ret:%d value:%d\n\n", "sTNum", ret, modelPara->sTNum); modelPara->sTList = malloc(sizeof(double) * modelPara->sTNum); ret = getArrayUsingName(child, modelPara->sTList, "sTList", modelPara->sTNum); printf("%s ret:%d value:%lf\n\n", "sTList", ret, modelPara->sTList[modelPara->sTNum - 1]); ret = getstringUsingName(child, modelPara->type, 127, "ftType"); printf("%s ret:%d value:%s\n\n", "ftType", ret, modelPara->type); modelPara++; numentries_idx++; } cJSON_Delete(json); free(data); return ret; }
参数打印函数
void print_model_matpara(modelPara_t *modelPara) { int i,j; if(modelPara->m) { printf("m[%d][%d]:\n", modelPara->nNumber, modelPara->fNumber); for(i=0; i<modelPara->nNumber; i++) { for(j=0; j<modelPara->fNumber; j++) { printf("%lf ", modelPara->m[i*modelPara->fNumber + j]); } printf("\n"); } } if(modelPara->c) { printf("c[%d][%d]:\n", modelPara->nNumber, modelPara->fNumber); for(i=0; i<modelPara->nNumber; i++) { for(j=0; j<modelPara->fNumber; j++) { printf("%lf ", modelPara->c[i*modelPara->fNumber + j]); } printf("\n"); } } if(modelPara->s) { printf("s[%d]:\n", modelPara->nNumber); for(i=0; i<1; i++) { for(j=0; j<modelPara->nNumber; j++) { printf("%lf ", modelPara->s[i*modelPara->nNumber + j]); } printf("\n"); } } if(modelPara->t) { printf("t[%d][%d]:\n", modelPara->nNumber, modelPara->nNumber); for(i=0; i<modelPara->nNumber; i++) { for(j=0; j<modelPara->nNumber; j++) { printf("%lf ", modelPara->t[i*modelPara->nNumber + j]); } printf("\n"); } } if(0 < modelPara->score_th_num) { printf("\n score_th_list[%d]:\n", modelPara->score_th_num); for(i=0; i<modelPara->score_th_num; i++) { printf("%lf ", modelPara->score_th_list[i]); } printf("\n"); } printf("\n height_th: %lf\n", modelPara->height_th); printf("\n height_max_th: %lf\n", modelPara->height_max_th); if(0 < modelPara->decay_factor_num) { printf("\ndecay_factor_num[%d]:\n", modelPara->decay_factor_num); for(i=0; i<modelPara->decay_factor_num; i++) { printf("%lf ", modelPara->decay_factor_list[i]); } printf("\n"); } if(0 < modelPara->sub_times_num) { printf("\nsub_times_num[%d]:\n", modelPara->sub_times_num); for(i=0; i<modelPara->sub_times_num; i++) { printf("%lf ", modelPara->sub_times_list[i]); } printf("\n"); } printf("\n up_th: %lf\n", modelPara->up_th); printf("\n up_num_th: %d\n", modelPara->up_num_th); printf("\n down_num_th: %d\n", modelPara->down_num_th); printf("\n peak_max_th: %lf\n", modelPara->peak_max_th); if(0 < modelPara->dumpling_num) { printf("\n dumpling_num: %d\n", modelPara->dumpling_num); } printf("\n fl: %d\n", modelPara->fl); printf("\n fs: %d\n", modelPara->fs); printf("\n pre_times: %lf\n", modelPara->pre_times); printf("\n late_time: %lf\n", modelPara->late_time); printf("\n ft_type: %s\n", modelPara->ft_type); printf("\n band_num: %d\n", modelPara->band_num); printf("\n frq_start: %lf\n", modelPara->frq_start); printf("\n frq_end: %lf\n", modelPara->frq_end); }
主函数
int main (int argc, const char * argv[]) { modelPara1_t modelPara[10]; /* dofile("./json.ini"); */ readHmodelParaFromfile1("./model_re.ini", modelPara, 10); printf("\n\n model 1\n\n"); print_model_matpara1(modelPara); printf("\n\n model 2\n\n"); print_model_matpara1(&modelPara[1]); return 0; }
C读取效果
