MKLDNN conv + elementwise_add fusion: output and elemwise param share data in conv primitive. Output is properly allocated

paddle/fluid/framework/ir/conv_elementwise_add_mkldnn_fuse_pass.cc

@@ -118,6 +118,7 @@ void CorrectGraphEdges(Graph* graph, Node* from, Node* to) {
 
     if (same != std::end(node.inputs)) {
       LinkNodes(to, &node);
+      node.Op()->SetInput("X", {to->Name()});
     }
   }
 }
@@ -145,7 +146,7 @@ graph_ptr ConvElementwiseAddMKLDNNFusePass::ApplyImpl(graph_ptr graph) const {
 
     op_desc.SetInput("Input", {conv_input->Name()});
     op_desc.SetInput("Filter", {conv_filter->Name()});
-    op_desc.SetInput("ElementwiseParameter", {elementwise_add_x->Name()});
+    op_desc.SetInput("EltwiseParameter", {elementwise_add_x->Name()});
     op_desc.SetOutput("Output", {conv_output->Name()});
 
     op_desc.SetAttr("use_mkldnn", true);
@@ -155,6 +156,7 @@ graph_ptr ConvElementwiseAddMKLDNNFusePass::ApplyImpl(graph_ptr graph) const {
 
     patterns::LinkNodes(conv_input, fused_conv_op);
     patterns::LinkNodes(conv_filter, fused_conv_op);
+    patterns::LinkNodes(elementwise_add_x, fused_conv_op);
     patterns::LinkNodes(fused_conv_op, conv_output);
   };
 

paddle/fluid/operators/conv_mkldnn_op.cc

@@ -396,7 +396,8 @@ class ConvMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
       PADDLE_ENFORCE(eltwise_param_data != nullptr, "Provide data if you want MKLDNN conv+elementwise_add fusion");
       PADDLE_ENFORCE_EQ(output->dims(), eltwise_param->dims(), "Output and elementwise parameter need to have the same dimension sizes");
 
-      output_data = const_cast<T*>(eltwise_param_data);
+      output_data = output->mutable_data<T>(ctx.GetPlace());
+      output->ShareDataWith(*eltwise_param);
     } else {
       output_data =
         output->mutable_data<T>(ctx.GetPlace(), handler.GetDstMemorySize());

paddle/fluid/operators/conv_op.cc

@@ -134,7 +134,8 @@ void Conv2DOpMaker::Make() {
       .Reuse("Input");
   AddInput("EltwiseParameter",
            "(Tensor) Tensor to which convolution output will be added."
-           "Used on with fuse_eltwise fusion.");
+           "Used on with fuse_eltwise fusion.")
+      .AsDispensable();
   AddAttr<std::vector<int>>("strides",
                             "(vector<int> default:{1, 1}), the "
                             "strides(h_stride, w_stride) of "