!15509 disable subgraph split

From: @ling_qiao_min
Reviewed-by: @zhanghaibo5,@zhang_xue_tong
Signed-off-by: @zhang_xue_tong

mindspore/lite/CMakeLists.txt

@@ -35,7 +35,7 @@ option(ENABLE_VERBOSE "" off)
 option(ENABLE_SSE "if x86_64 support SSE instruction set" off)
 option(ENABLE_AVX "if x86_64 support SSE instruction set" off)
 option(ENABLE_MINDRT "if support mindrt" on)
-option(SUBGRAPH_SPLIT "if support sub graph split" on)
+option(SUBGRAPH_SPLIT "if support sub graph split" off)
 
 set(DIR_PREFIX mindspore-lite)
 set(MS_VERSION ${MS_VERSION_MAJOR}.${MS_VERSION_MINOR}.${MS_VERSION_REVISION})

mindspore/lite/src/sub_graph_split.cc

@@ -268,13 +268,18 @@ void SearchSubGraph::SubgraphFusion() {
 
   return;
 }
-
-void SearchSubGraph::SubGraphSplitByOutput() {
-  if (!context_->IsGpuEnabled() || output_nodes_.size() > 4) {
-    return;
+bool SearchSubGraph::ModelValid() {
+  if (context_->IsNpuEnabled()) {
+    return false;
+  }
+  if (context_->IsGpuEnabled()) {
+    return false;
   }
+  return false;
+}
 
-  if (context_->IsCpuFloat16Enabled() || context_->IsGpuFloat16Enabled()) {
+void SearchSubGraph::SubGraphSplitByOutput() {
+  if (!ModelValid()) {
     return;
   }
 

mindspore/lite/src/sub_graph_split.h

@@ -63,6 +63,7 @@ class SearchSubGraph {
   void InitSubgraphDevice();
   void SubgraphFusion();
   void InitMainGraphDevice();
+  bool ModelValid();
 
  private:
   const InnerContext *context_ = nullptr;