add gpu predict interface

metal/paddle-mobile-demo/paddle-mobile-demo/LoadPointerViewController.m

@@ -126,14 +126,23 @@
 
 - (void)predict {
   _texture = [self createTextureFromImage:[UIImage imageNamed:@"hand.jpg"] device:self.device];
+  NSTimeInterval startTime = [[NSDate date] timeIntervalSince1970];
+  NSInteger max = 428;
+  for (int i = 0;i < max; i ++) {
     [_runner predict:_texture withCompletion:^(BOOL success , NSArray<NSNumber *> *result) {
       if (success) {
-      for (int i = 0; i < result.count; i ++) {
-        NSNumber *number = result[i];
-        NSLog(@"result %d = %f:",i, [number floatValue]);
+        if (i == max -1) {
+          double time = [[NSDate date] timeIntervalSince1970] - startTime;
+          time = (time/max)*1000;
+          NSLog(@"gap ==== %fms",time);
         }
+//        for (int i = 0; i < result.count; i ++) {
+//          NSNumber *number = result[i];
+//          NSLog(@"result %d = %f:",i, [number floatValue]);
+//        }
       }
     }];
+  }
 }
 
 - (void)didReceiveMemoryWarning {

metal/paddle-mobile/paddle-mobile/PaddleMobileGPU.h

@@ -21,6 +21,16 @@ typedef enum : NSUInteger {
   GenetType,
 } NetType;
 
+@interface PaddleMobileGPUResult: NSObject
+
+@property (assign, nonatomic) float *output;
+
+@property (assign, nonatomic) int outputSize;
+
+-(void)releaseOutput;
+
+@end
+
 @interface ModelConfig: NSObject
 
 /*
@@ -81,6 +91,12 @@ typedef enum : NSUInteger {
  */
 -(void)predict:(id<MTLTexture>)texture withCompletion:(void (^)(BOOL, NSArray<NSNumber *> *))completion;
 
+/*
+ * texture:     需要进行预测的图像转换的 texture
+ * completion:  预测完成回调
+ */
+-(void)predict:(id<MTLTexture>)texture withResultCompletion:(void (^)(BOOL, PaddleMobileGPUResult *))completion;
+
 /*
  * 清理内存
  */

metal/paddle-mobile/paddle-mobile/PaddleMobileGPU.m

@@ -14,6 +14,26 @@
 @implementation ModelConfig
 @end
 
+@interface PaddleMobileGPUResult ()
+
+@property (strong, nonatomic) ResultHolder *resultHolder;
+
+- (void)setOutputResult:(ResultHolder *)resultHolder;
+
+@end
+
+@implementation PaddleMobileGPUResult
+- (void)setOutputResult:(ResultHolder *)resultHolder {
+  self.resultHolder = resultHolder;
+  self.output = resultHolder.result;
+  self.outputSize = resultHolder.capacity;
+}
+
+-(void)releaseOutput {
+  [self.resultHolder releasePointer];
+}
+@end
+
 @interface PaddleMobileGPU ()
 {
   Runner *runner;
@@ -52,7 +72,14 @@
     [result releasePointer];
     
   }];
-//  [runner predictWithTexture:texture completion:completion];
+}
+
+-(void)predict:(id<MTLTexture>)texture withResultCompletion:(void (^)(BOOL, PaddleMobileGPUResult *))completion {
+  [runner predictWithTexture:texture completion:^(BOOL success, ResultHolder * _Nullable result) {
+    PaddleMobileGPUResult *gpuResult = [[PaddleMobileGPUResult alloc] init];
+    [gpuResult setOutputResult:result];
+    completion(success, gpuResult);
+  }];
 }
 
 -(void)clear {