fix webgl kernel memory leak

Author: Kim

src/image-target/detector/kernels/webgl/binomialFilter.js

@@ -58,7 +58,9 @@ export const binomialFilter = (args) =>{//{inputs: UnaryInputs, backend: MathBac
   const[kernel1,kernel2]=GetKernels(image);
 
   const result1=backend.runWebGLProgram(kernel1,[image],image.dtype);
-  return backend.runWebGLProgram(kernel2,[result1],image.dtype);  
+  const result2=backend.runWebGLProgram(kernel2,[result1],image.dtype);  
+  backend.disposeIntermediateTensorInfo(result1);
+  return result2;
 }
 
 

src/image-target/detector/kernels/webgl/computeOrientationHistograms.js

@@ -114,8 +114,9 @@ export const computeOrientationHistograms=(args)=>{
     const [program1,program2]=GetPrograms(prunedExtremasT, radialPropertiesT,pyramidImagesLength);
 
     const result1 = backend.runWebGLProgram(program1, [...gaussianImagesT, prunedExtremasT, radialPropertiesT],radialPropertiesT.dtype);
-	return backend.runWebGLProgram(program2, [result1],radialPropertiesT.dtype);
-    
+    const result2 = backend.runWebGLProgram(program2, [result1],radialPropertiesT.dtype);
+    backend.disposeIntermediateTensorInfo(result1);
+    return result2;
 }
 
 export const computeOrientationHistogramsConfig={

src/image-target/detector/kernels/webgl/smoothHistograms.js

@@ -37,7 +37,11 @@ export const smoothHistograms=(args)=>{
 
     const program = GetProgram(histograms);
     for (let i = 0; i < ORIENTATION_SMOOTHING_ITERATIONS; i++) {
+        const _histograms = histograms;
         histograms = backend.runWebGLProgram(program,[histograms],histograms.dtype);//this._compileAndRun(program, [histograms]);
+      	if (i > 0) {
+	  backend.disposeIntermediateTensorInfo(_histograms);
+	}
     }
     return histograms;