Add CUDA stream when launching kernel.

paddle/operators/crop_op.cu

@@ -88,7 +88,13 @@ void CropCUDAFunctoin(const framework::ExecutionContext& context) {
   int d = out_dims[1];
   int block = 512;
   int grid = (n * d + block - 1) / block;
-  CropKernel<T, D><<<grid, block>>>(out_count, out_shape_gpu, x_shape_gpu,
+
+  auto* device_context =
+      const_cast<platform::DeviceContext*>(context.device_context_);
+  CropKernel<T,
+             D><<<grid, block, 0,
+                  reinterpret_cast<platform::CUDADeviceContext*>(device_context)
+                      ->stream()>>>(out_count, out_shape_gpu, x_shape_gpu,
                                     crop_rules_gpu, x_data, out_data);
   cudaFree(crop_rules_gpu);
   cudaFree(x_shape_gpu);