[TensorRT] Add inputs of the very first ConcatOp to exclude list.

Signed-off-by: 泊霆 <hujunqi.hjq@alibaba-inc.com>

Author: Mesilenceki

tensorflow/compiler/tf2tensorrt/convert/convert_graph.cc

@@ -82,6 +82,57 @@ Status BuildNodeMap(const Graph& graph,
   return Status::OK();
 }
 
+Status FindExtraConcatInput(const Graph& graph,
+                             const std::vector<std::string>& input_output_names,
+                             std::vector<const Node*>* filter_concat_node) {
+  std::unordered_set<const Node*> candidate_node;
+  std::unordered_set<Node*> concat_nodes;
+  for (auto* node : graph.nodes()) {
+    if (node->type_string() == "ConcatV2") {
+      concat_nodes.insert(node);
+    }
+  }
+  std::unordered_set<std::string> in_out_names;
+  for (auto& name : input_output_names) {
+    in_out_names.insert(name);
+  }
+  for (const Node* c_nodes : concat_nodes) {
+    std::vector<const Node*> in_placeholder;
+    ReverseDFSFrom(
+        graph, {c_nodes},
+        [&in_placeholder, in_out_names](const Node* node) {
+          if (in_out_names.find(node->name()) != in_out_names.end()) {
+            in_placeholder.emplace_back(node);
+          }
+        },
+        /*end*/ nullptr);
+    if (in_placeholder.size() > 1) { // verify node in common sub-graph
+      DataType t_types;
+      TF_RETURN_IF_ERROR(GetNodeAttr(c_nodes->attrs(), "T", &t_types));
+      if (t_types == DT_FLOAT) {
+        candidate_node.insert(c_nodes);
+      }
+    }
+  }
+
+  for (const Node* cnode : candidate_node) {
+    bool is_admit = true;
+    ReverseDFSFrom(graph, {cnode},
+                   [&filter_concat_node, &is_admit, candidate_node,
+                    cnode](const Node* node) {
+                     if ((candidate_node.find(node) != candidate_node.end()) &&
+                         (cnode->name() != node->name())) {
+                       is_admit = false;
+                     }
+                   },
+                   /*end*/ nullptr);
+    if (is_admit) {
+      filter_concat_node->emplace_back(cnode);
+    }
+  }
+  return Status::OK();
+}
+
 EngineInfo::EngineType GetEngineType(
     const TRTOptimizationPass::ConversionParams& params) {
   return (params.is_dynamic_op || params.use_calibration)
@@ -773,6 +824,14 @@ Status ConvertGraph(const TRTOptimizationPass::ConversionParams& params,
   for (const auto& node : input_output_names) {
     segment_options.exclude_node_list.insert(node);
   }
+  std::vector<const Node*> filter_concat_node;
+  TF_RETURN_IF_ERROR(
+      FindExtraConcatInput(graph, input_output_names, &filter_concat_node));
+  for (const auto* node : filter_concat_node) {
+    for (auto* inode : node->in_nodes()) {
+      segment_options.exclude_node_list.insert(inode->name());
+    }
+  }
   segment_options.minimum_segment_size = params.minimum_segment_size;
   segment_options.use_implicit_batch = params.use_implicit_batch;
   if (segment_options.use_implicit_batch)