Change shared_ptr<Node> to Output<Node> for AvgPoolBackprop (#3754)

src/ngraph/op/avg_pool.cpp

@@ -234,13 +234,13 @@ shared_ptr<Node> op::v0::AvgPool::get_default_value() const
 }
 
 op::v0::AvgPoolBackprop::AvgPoolBackprop(const Shape& forward_arg_shape,
-                                         const shared_ptr<Node>& delta,
+                                         const Output<Node>& delta,
                                          const Shape& window_shape,
                                          const Strides& window_movement_strides,
                                          const Shape& padding_below,
                                          const Shape& padding_above,
                                          bool include_padding_in_avg_computation)
-    : Op(check_single_output_args({delta}))
+    : Op({delta})
     , m_forward_arg_shape(forward_arg_shape)
     , m_window_shape(window_shape)
     , m_window_movement_strides(window_movement_strides)

src/ngraph/op/avg_pool.hpp

@@ -179,7 +179,7 @@ namespace ngraph
                 const NodeTypeInfo& get_type_info() const override { return type_info; }
                 AvgPoolBackprop() = default;
                 AvgPoolBackprop(const Shape& forward_arg_shape,
-                                const std::shared_ptr<Node>& delta,
+                                const Output<Node>& delta,
                                 const Shape& window_shape,
                                 const Strides& window_movement_strides,
                                 const Shape& padding_below,