Raise exception on missing unused input_map keys with C API enabled.

Without this change, the C++ ImportGraphDef API returns unused
input_map keys (which are plumbed through to the C API as
well). However, the Python import_graph_def API requires slightly
different semantics: it throws an error for unused input_map keys that
are missing from the GraphDef.

This change modifies the C and C++ APIs to limit the returned keys to
those missing from the GraphDef, and plumbs this through to the C
API-enabled import_graph_def implementation.

Note that this is a change to the existing C API. Luckily the modified
method hasn't been released yet, so it's ok to change it.

PiperOrigin-RevId: 178783957

1 files changed, 2 insertions, 2 deletions

diff --git a/tensorflow/c/c_api_test.cc b/tensorflow/c/c_api_test.cc
index 6ec1db8ccf..4e89b4fc43 100644
--- a/tensorflow/c/c_api_test.cc
+++ b/tensorflow/c/c_api_test.cc
@@ -773,7 +773,7 @@ TEST(CAPI, ImportGraphDef_WithReturnOutputs) {
   TF_DeleteStatus(s);
 }
 
-TEST(CAPI, ImportGraphDef_UnusedInputMappings) {
+TEST(CAPI, ImportGraphDef_MissingUnusedInputMappings) {
   TF_Status* s = TF_NewStatus();
   TF_Graph* graph = TF_NewGraph();
 
@@ -816,7 +816,7 @@ TEST(CAPI, ImportGraphDef_UnusedInputMappings) {
   int num_unused_input_mappings;
   const char** src_names;
   int* src_indexes;
-  TF_ImportGraphDefResultsUnusedInputMappings(
+  TF_ImportGraphDefResultsMissingUnusedInputMappings(
       results, &num_unused_input_mappings, &src_names, &src_indexes);
   ASSERT_EQ(1, num_unused_input_mappings);
   EXPECT_EQ(string("fake"), string(src_names[0]));