Hi，there

I am just wanna port OpenVX to our board ，and found the convolution layer only has the argument：

```
typedef struct _vx_nn_convolution_params_t
{
vx_size padding_x; /*!< \brief Number of elements added at each side in the x dimension of the input. */
vx_size padding_y; /*!< \brief Number of elements added at each side in the y dimension of the input. */
vx_enum overflow_policy; /*!< \brief A <tt> VX_TYPE_ENUM</tt> of the <tt> vx_convert_policy_e</tt> enumeration. */
vx_enum rounding_policy; /*!< \brief A <tt> VX_TYPE_ENUM</tt> of the <tt> vx_round_policy_e</tt> enumeration. */
vx_enum down_scale_size_rounding; /*!< \brief Rounding method for calculating output dimensions. See <tt>\ref vx_nn_rounding_type_e</tt> */
vx_size dilation_x; /*!< \brief "inflate" the kernel by inserting zeros between the kernel elements in the x direction. The value is the number of zeros to insert.*/
vx_size dilation_y; /*!< \brief "inflate" the kernel by inserting zeros between the kernel elements in the y direction. The value is the number of zeros to insert.*/
} vx_nn_convolution_params_t;
```

and in my models the cnn has the stride value ， so how can I input the stride value ？