Function mpsgraph_graph_while_loop 

pub unsafe extern "C" fn mpsgraph_graph_while_loop(
    graph_handle: *mut c_void,
    input_handles: *const *mut c_void,
    input_count: usize,
    before_callback: Option<WhileBeforeCallback>,
    before_context: *mut c_void,
    after_callback: Option<TensorArrayInputCallback>,
    after_context: *mut c_void,
    name: *const c_char,
) -> *mut c_void