LRN reengineering

Added reading dst mem pd from lrn pd
coding style fixes

test=develop

paddle/fluid/operators/lrn_mkldnn_op.cc

@@ -78,10 +78,7 @@ class LRNMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
     auto dims = paddle::framework::vectorize2int(x->dims());
 
     auto src_md = paddle::platform::MKLDNNMemDesc(
-        dims, mkldnn::memory::data_type::f32, mkldnn::memory::format::nchw);
-
-    auto dst_md = paddle::platform::MKLDNNMemDesc(
-        dims, mkldnn::memory::data_type::f32, mkldnn::memory::format::nchw);
+        dims, mkldnn::memory::data_type::f32, x->format());
 
     auto forward_desc = mkldnn::lrn_forward::desc{mkldnn::prop_kind::forward,
                                                   mkldnn::lrn_across_channels,
@@ -92,8 +89,6 @@ class LRNMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
                                                   k};
 
     auto src_memory_pd = mkldnn::memory::primitive_desc{src_md, mkldnn_engine};
-    auto dst_memory = mkldnn::memory{{dst_md, mkldnn_engine},
-                                     static_cast<void*>(output_data)};
 
     if (!is_test) {
       const std::string key = ctx.op().Output("Out");
@@ -110,11 +105,16 @@ class LRNMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
       src_memory->set_data_handle(
           static_cast<void*>(const_cast<T*>(input_data)));
 
+      auto dst_memory = mkldnn::memory(forward_pd->dst_primitive_desc(),
+                                       static_cast<void*>(output_data));
       auto workspace_memory = insert_to_context<mkldnn::memory>(
           key_workspace_memory, dev_ctx,
           forward_pd->workspace_primitive_desc());
 
       run_primitive(*forward_pd, *src_memory, *workspace_memory, dst_memory);
+
+      out->set_layout(framework::DataLayout::kMKLDNN);
+      out->set_format(platform::GetMKLDNNFormat(dst_memory));
     } else {
       auto forward_pd =
           mkldnn::lrn_forward::primitive_desc{forward_desc, mkldnn_engine};
@@ -122,8 +122,13 @@ class LRNMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
           src_memory_pd, static_cast<void*>(const_cast<T*>(input_data))};
       auto workspace_memory =
           mkldnn::memory{forward_pd.workspace_primitive_desc()};
+      auto dst_memory = mkldnn::memory(forward_pd.dst_primitive_desc(),
+                                       static_cast<void*>(output_data));
 
       run_primitive(forward_pd, src_memory, workspace_memory, dst_memory);
+
+      out->set_layout(framework::DataLayout::kMKLDNN);
+      out->set_format(platform::GetMKLDNNFormat(dst_memory));
     }
   }
 };