[LITE][OPENCL][Image] use unique_ptr to wrap filter and bias in conv image compute , test=develop

lite/kernels/opencl/activation_image_compute.cc

@@ -81,10 +81,6 @@ class ActivationComputeImageDefault
                                     "image/activation_kernel.cl",
                                     build_options_,
                                     time_stamp_);
-
-    STL::stringstream kernel_key;
-    kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
-    auto kernel = context.cl_context()->GetKernel(kernel_key.str());
   }
 
   void ReInitWhenNeeded() override {
@@ -119,10 +115,11 @@ class ActivationComputeImageDefault
         out_img_shape_[0], out_img_shape_[1]);
     auto& context = ctx_->As<OpenCLContext>();
     CHECK(context.cl_context() != nullptr);
+
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
+
     cl_int status;
     status = kernel->setArg(0, *x_img);
     CL_CHECK_FATAL(status);
@@ -170,7 +167,6 @@ class ActivationComputeImageDefault
   std::string kernel_func_name_{};
   float threshold_{6.f};
   float scale_{1.f};
-  cl::Kernel kernel;
   bool first_epoch_for_reinit_{true};
   cl::NDRange global_work_size_ = cl::NDRange{
       static_cast<size_t>(1), static_cast<size_t>(1), static_cast<size_t>(1)};

lite/kernels/opencl/fc_buffer_compute.cc

@@ -108,7 +108,6 @@ class FcCompute
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
     cl_int status;
     status = kernel->setArg(0, *x_buf);
     CL_CHECK_FATAL(status);
@@ -145,7 +144,7 @@ class FcCompute
   bool first_epoch_for_reinit_{true};
   DDim last_x_dims_;
   cl::NDRange global_work_size_;
-  cl::Kernel kernel;
+
   std::shared_ptr<cl::Event> event_{new cl::Event};
 };
 

lite/kernels/opencl/scale_image_compute.cc

@@ -85,7 +85,6 @@ class ScaleComputeImage2D : public KernelLite<TARGET(kOpenCL),
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
     cl_int status;
     status = kernel->setArg(0, *x_img);
     CL_CHECK_FATAL(status);
@@ -114,7 +113,7 @@ class ScaleComputeImage2D : public KernelLite<TARGET(kOpenCL),
   std::shared_ptr<cl::Event> event_{new cl::Event};
 
   param_t* scale_param_{nullptr};
-  cl::Kernel kernel;
+
   bool first_epoch_for_reinit_{true};
   DDim last_x_dims_;
   DDim out_img_shape_ = DDim(std::vector<DDim::value_type>(