In Grappler item builder, support inferring fetch nodes from siganture defs.

PiperOrigin-RevId: 187364078

1 files changed, 64 insertions, 12 deletions

diff --git a/tensorflow/core/grappler/grappler_item_builder.cc b/tensorflow/core/grappler/grappler_item_builder.cc
index 606807b9e9..33ad426bbf 100644
--- a/tensorflow/core/grappler/grappler_item_builder.cc
+++ b/tensorflow/core/grappler/grappler_item_builder.cc
@@ -168,12 +168,6 @@ std::unique_ptr<GrapplerItem> GrapplerItemFromMetaGraphDef(
   // Fill in feed nodes from config, if any provided.
   for (const auto& feed_node : cfg.feed_nodes) {
     const string feed_name = NodeName(feed_node);
-    if (feed_name.empty()) {
-      LOG(ERROR) << "Invalid feed node name " << feed_node
-                 << ", skipping this input.";
-      return nullptr;
-    }
-    VLOG(1) << "Will use feed node " << feed_name;
     new_item->feed.emplace_back(feed_name, Tensor());
   }
 
@@ -182,17 +176,75 @@ std::unique_ptr<GrapplerItem> GrapplerItemFromMetaGraphDef(
     const CollectionDef& nodes = meta_graph.collection_def().at("train_op");
     if (nodes.has_node_list()) {
       for (const auto& node : nodes.node_list().value()) {
-        const string name = NodeName(node);
-        if (name.empty()) {
-          LOG(ERROR) << "Invalid fetch node name " << node
-                     << ", skipping this input";
+        new_item->fetch.push_back(NodeName(node));
+      }
+    }
+  }
+
+  // Detect feed and fetch nodes from signature defs.
+  for (const auto& name_and_signature : meta_graph.signature_def()) {
+    for (const auto& name_and_input : name_and_signature.second.inputs()) {
+      const TensorInfo& input = name_and_input.second;
+      if (input.has_coo_sparse()) {
+        // Define the shapes following the comment of CooSparse.
+        PartialTensorShape partial_shape_1d({-1});
+        PartialTensorShape partial_shape_2d({-1, -1});
+        TensorShape shape_1d;
+        TensorShape shape_2d;
+        if (!partial_shape_1d.AsTensorShape(&shape_1d) ||
+            !partial_shape_2d.AsTensorShape(&shape_2d)) {
+          LOG(ERROR) << "Internal error when constructing tensor shapes.";
           return nullptr;
         }
-        VLOG(1) << "Will use fetch node " << name;
-        new_item->fetch.push_back(name);
+
+        new_item->feed.emplace_back(
+            NodeName(input.coo_sparse().values_tensor_name()),
+            Tensor(input.dtype(), shape_1d));
+        new_item->feed.emplace_back(
+            NodeName(input.coo_sparse().indices_tensor_name()),
+            Tensor(DT_INT64, shape_2d));
+        new_item->feed.emplace_back(
+            NodeName(input.coo_sparse().dense_shape_tensor_name()),
+            Tensor(DT_INT64, shape_1d));
+      } else {
+        new_item->feed.emplace_back(
+            NodeName(input.name()),
+            Tensor(input.dtype(), input.tensor_shape()));
       }
     }
+    for (const auto& name_and_output : name_and_signature.second.outputs()) {
+      const TensorInfo& output = name_and_output.second;
+      if (output.has_coo_sparse()) {
+        new_item->fetch.push_back(
+            NodeName(output.coo_sparse().values_tensor_name()));
+        new_item->fetch.push_back(
+            NodeName(output.coo_sparse().indices_tensor_name()));
+        new_item->fetch.push_back(
+            NodeName(output.coo_sparse().dense_shape_tensor_name()));
+      } else {
+        new_item->fetch.push_back(NodeName(output.name()));
+      }
+    }
+  }
+
+  for (const auto& feed : new_item->feed) {
+    if (feed.first.empty()) {
+      LOG(ERROR) << "Invalid feed node name skipping this input";
+      return nullptr;
+    } else {
+      VLOG(1) << "Will use feed node " << feed.first;
+    }
+  }
+
+  for (const auto& fetch : new_item->fetch) {
+    if (fetch.empty()) {
+      LOG(ERROR) << "Invalid fetch node name skipping this input";
+      return nullptr;
+    } else {
+      VLOG(1) << "Will use fetch node " << fetch;
+    }
   }
+
   if (new_item->fetch.empty()) {
     LOG(ERROR) << "Failed to detect the fetch node(s), skipping this input";
     return nullptr;