fix loadWhenPredict option in PaddleMobileCPUConfig

src/io/ios_io/PaddleMobileCPU.h

@@ -44,6 +44,11 @@
  */
 @property  (assign, nonatomic) BOOL optimize;
 
+/**
+ @b 是否预测时初始化内存，用于处理可变输入
+ */
+@property  (assign, nonatomic) BOOL loadWhenPredict;
+
 @end
 
 @interface PaddleMobileCPU : NSObject

src/io/ios_io/PaddleMobileCPU.mm

@@ -73,6 +73,8 @@ static std::mutex shared_mutex;
 
 - (instancetype)initWithConfig:(PaddleMobileCPUConfig *)config {
   if (self = [super init]) {
+    paddle_mobile::PaddleMobileConfigInternal configInternal;
+    configInternal.load_when_predict = config.loadWhenPredict;
     pam_ = new paddle_mobile::PaddleMobile<paddle_mobile::CPU, float>();
     _config = config;
   }