Update GraphDef version to 731.

PiperOrigin-RevId: 367594514
Change-Id: I42f29040c6f1d96148cbfff394641e100cd4fd9a
diff --git a/tensorflow/core/public/version.h b/tensorflow/core/public/version.h
index 0f14414..3a77dbb 100644
--- a/tensorflow/core/public/version.h
+++ b/tensorflow/core/public/version.h
@@ -108,7 +108,7 @@
 
 #define TF_GRAPH_DEF_VERSION_MIN_PRODUCER 0
 #define TF_GRAPH_DEF_VERSION_MIN_CONSUMER 0
-#define TF_GRAPH_DEF_VERSION 730  // Updated: 2021/4/8
+#define TF_GRAPH_DEF_VERSION 731  // Updated: 2021/4/9
 
 // Checkpoint compatibility versions (the versions field in SavedSliceMeta).
 //