Namespace change on ort flatbuffers schema (#4886)

* correct some errors in the flatbuffers schema, move flatbuffers submodule to cmake/external

* update the ort flatbuffers schema to use less namespace

* minor update

Co-authored-by: gwang0000 <62914304+gwang0000@users.noreply.github.com>

.gitmodules

@@ -62,6 +62,6 @@
 [submodule "cmake/external/onnx-tensorrt"]
 	path = cmake/external/onnx-tensorrt
 	url = https://github.com/onnx/onnx-tensorrt.git
-[submodule "flatbuffers"]
-	path = flatbuffers
+[submodule "cmake/external/flatbuffers"]
+	path = cmake/external/flatbuffers
 	url = https://github.com/google/flatbuffers.git

cgmanifests/submodules/cgmanifest.json

@@ -81,6 +81,16 @@
         "comments": "git submodule at cmake/external/eigen"
       }
     },
+    {
+      "component": {
+        "type": "git",
+        "git": {
+          "commitHash": "db2aa9b4eca0edc94aea9e2059c21ce8786fc762",
+          "repositoryUrl": "https://github.com/google/flatbuffers.git"
+        },
+        "comments": "git submodule at cmake/external/flatbuffers"
+      }
+    },
     {
       "component": {
         "type": "git",
@@ -531,16 +541,6 @@
         "comments": "git submodule at cmake/external/wil"
       }
     },
-    {
-      "component": {
-        "type": "git",
-        "git": {
-          "commitHash": "f3003e08d02ca4810924a53ca463a8b3150926d8",
-          "repositoryUrl": "https://github.com/google/flatbuffers.git"
-        },
-        "comments": "git submodule at flatbuffers"
-      }
-    },
     {
       "component": {
         "type": "git",

cmake/external/flatbuffers

@@ -0,0 +1 @@
+Subproject commit db2aa9b4eca0edc94aea9e2059c21ce8786fc762

flatbuffers

@@ -1 +0,0 @@
-Subproject commit f3003e08d02ca4810924a53ca463a8b3150926d8

onnxruntime/core/flatbuffers/ort.fbs

@@ -1,9 +1,10 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-namespace onnxruntime.experimental.fbs.Attribute;
+namespace onnxruntime.experimental.fbs;
 
-enum Type : int {
+// Attribute
+enum AttributeType : int {
   UNDEFINED = 0,
   FLOAT = 1,
   INT = 2,
@@ -19,9 +20,8 @@ enum Type : int {
   SPARSE_TENSORS = 12,
 }
 
-namespace onnxruntime.experimental.fbs.Tensor.Shape;
-
-table Info {
+// Shape
+table Shape {
 dim:[Dimension];
 }
 
@@ -35,9 +35,8 @@ table DimensionValue {
   dim_param:string;
 }
 
-namespace onnxruntime.experimental.fbs.Tensor;
-
-enum DataType : int {
+// Tensor
+enum TensorDataType : int {
   UNDEFINED = 0,
   FLOAT = 1,
   UINT8 = 2,
@@ -57,13 +56,12 @@ enum DataType : int {
   BFLOAT16 = 16,
 }
 
-table TypeInfo{
-  elem_type:DataType;
-  shape:Shape.Info;
+table TensorTypeAndShape{
+  elem_type:TensorDataType;
+  shape:Shape;
 }
 
-namespace onnxruntime.experimental.fbs.Graph;
-
+// Node
 enum NodeType : int {
   Primitive = 0,
   Fused = 1,
@@ -85,7 +83,7 @@ table Node {
   op_type:string;
   type:NodeType;
   execution_provider_type:string;
-  
+
   inputs:[string];
   outputs:[string];
   attributes:[onnxruntime.experimental.fbs.Attribute];
@@ -94,13 +92,7 @@ table Node {
   implicit_inputs:[string];
 }
 
-namespace onnxruntime.experimental.fbs;
-
-table OperatorSetId {
-  domain:string;
-  version:long;
-}
-
+// ValueInfo
 table ValueInfo {
   name:string;
   doc_string:string;
@@ -109,7 +101,7 @@ table ValueInfo {
 
 // TODO add support of Sequence/Map/SparseTensor/Opaque
 union TypeInfoValue {
-  tensor_type:Tensor.TypeInfo,
+  tensor_type:TensorTypeAndShape,
 }
 
 table TypeInfo {
@@ -117,15 +109,21 @@ table TypeInfo {
   value:TypeInfoValue;
 }
 
+// OpSetId
+table OperatorSetId {
+  domain:string;
+  version:long;
+}
+
 // For simplicity, we will have only two data fields
 // - string_data for string
 // - raw_data for all other types
 table Tensor {
   name:string;
   doc_string:string;
-  
+
   dims:[long];
-  data_type:Tensor.DataType;
+  data_type:TensorDataType;
 
   raw_data:[ubyte];
 
@@ -136,15 +134,15 @@ table Tensor {
 table Attribute{
   name:string;
   doc_string:string;
-  
-  type:Attribute.Type;
-  
+
+  type:AttributeType;
+
   f:float;
   i:long;
   s:[ubyte];
   t:Tensor;
   g:Graph;
-  
+
   floats:[float];
   ints:[long];
   strings:[string];
@@ -156,11 +154,11 @@ table Graph{
   initializers:[Tensor];
 
   node_args:[ValueInfo];
-  nodes:[Graph.Node];
+  nodes:[Node];
   max_node_index:uint;
 
-  input_edges:[Graph.EdgeEnd];
-  output_edges:[Graph.EdgeEnd];
+  input_edges:[EdgeEnd];
+  output_edges:[EdgeEnd];
 
   inputs:[string];
   outputs:[string];