ZerosLike in symbolicgradient for resource variables

PiperOrigin-RevId: 208720651

1 files changed, 31 insertions, 10 deletions

diff --git a/tensorflow/core/graph/gradients.cc b/tensorflow/core/graph/gradients.cc
index c1a8a63784..bec41712b1 100644
--- a/tensorflow/core/graph/gradients.cc
+++ b/tensorflow/core/graph/gradients.cc
@@ -65,16 +65,37 @@ struct NodeOutEq {
 static Node* AddZerosLike(Graph* g, NodeOut input) {
   DCHECK_LT(0, input.dtype());
   DCHECK_LT(input.dtype(), DT_FLOAT_REF);
-  NodeDef ndef;
-  ndef.set_name(g->NewName(kNodeLabel));
-  ndef.set_op("ZerosLike");
-  ndef.add_input(input.name());
-  AddNodeAttr("T", input.dtype(), &ndef);
-  Status s;
-  Node* ret = g->AddNode(ndef, &s);
-  TF_CHECK_OK(s);
-  g->AddEdge(input.node, input.index, ret, 0);
-  return ret;
+  if (input.dtype() == DT_RESOURCE) {
+    NodeDef read_def;
+    read_def.set_name(g->NewName("Read"));
+    read_def.set_op("ReadVariableOp");
+    read_def.add_input(input.name());
+    AddNodeAttr("dtype", DT_FLOAT, &read_def);
+    Status s;
+    Node* read = g->AddNode(read_def, &s);
+    TF_CHECK_OK(s);
+    g->AddEdge(input.node, input.index, read, 0);
+    NodeDef ndef;
+    ndef.set_name(g->NewName(kNodeLabel));
+    ndef.set_op("ZerosLike");
+    ndef.add_input(read_def.name());
+    AddNodeAttr("T", DT_FLOAT, &ndef);
+    Node* ret = g->AddNode(ndef, &s);
+    TF_CHECK_OK(s);
+    g->AddEdge(read, 0, ret, 0);
+    return ret;
+  } else {
+    NodeDef ndef;
+    ndef.set_name(g->NewName(kNodeLabel));
+    ndef.set_op("ZerosLike");
+    ndef.add_input(input.name());
+    AddNodeAttr("T", input.dtype(), &ndef);
+    Status s;
+    Node* ret = g->AddNode(ndef, &s);
+    TF_CHECK_OK(s);
+    g->AddEdge(input.node, input.index, ret, 0);
+    return ret;
+  }
 }
 
 static Node* AddSymGrad(Graph* g, Node* n, gtl::ArraySlice<NodeOut> grads) {