OnnxProto changes for multidevice

onnx/onnx.in.proto

@@ -231,6 +231,63 @@ message NodeProto {
 
   // Named metadata values; keys should be distinct.
   repeated StringStringEntryProto metadata_props = 9;
+
+  // Configuration of multi-device annotations.
+  repeated NodeConfigurationProto configuration = 10;
+}
+
+// Multi-device configuration proto for NodeProto.
+message NodeConfigurationProto {
+    // ID of the configuration.
+    string configuration_id = 1;
+    // Sharding spec for the node.
+    repeated ShardingSpecProto sharding_spec = 2;
+    // Pipeline stage of this node.
+    optional int pipeline_stage = 3;
+}
+
+// ShardingSpecProto: This describes the sharding spec for a specific
+// input/output of a node.
+message ShardingSpecProto {
+  // Identifies the input/output of the node that is being sharded.
+  // It is called `logical tensor` in subsequent descriptions.
+  string tensor_name = 1;
+
+  // The following is the list of devices across which the logical
+  // tensor is sharded or replicated.
+  repeated int64 device = 2;
+
+  // Each element v in above field devices may represent either a
+  // device or a set of devices (when we want the same shard/tensor
+  // to be replicated across a subset of devices), as indicated by
+  // the following optional map. If the map contains an entry for v,
+  // then v represents a device group, and the map indicates the set
+  // of devices in that group.
+  optional map<int, IntListProto> index_to_device_group_map = 3;
+
+  // The following is the sharded-shape of the tensor, consisting of
+  // the sharding-spec for each axis of the tensor.
+  repeated ShardedDimProto sharded_dim = 4;
+}
+
+// ShardedDimProto: This describes the sharding spec for a single
+// axis of a sharded tensor.
+message ShardedDimProto {
+  int32 axis = 1;  // the axis this sharding corresponds to
+  // The common-case is described by a single instance of SimpleShardedDimProto
+  // We use multiple instances to handle cases produced when a sharded
+  // tensor is reshaped, fusing multiple axes into one.
+  repeated SimpleShardedDimProto simple_sharding = 2;
+}
+
+// SimpleShardedDimProto: Indicates that N blocks are divided into M shards.
+// Here, N is allowed to be symbolic, which M is required to be a constant.
+message SimpledShardedDimProto {
+    oneof dim {
+        int64 dim_value = 1;
+        string dim_param = 2;
+    }
+    optional int32 num_shards = 3;
 }
 
 // Training information
@@ -430,8 +487,22 @@ message ModelProto {
   // One FunctionProto can reference other FunctionProto in the model, however, recursive reference
   // is not allowed.
   repeated FunctionProto functions = 25;
+
+  // Describes different target configurations for a multi-device use case.
+  // A model can describe multiple multi-device configurations for execution.
+  repeated ConfigurationProto configuration = 26;
 };
 
+// ConfigurationProto describes a multi-device configuration for a model.
+message ConfigurationProto {
+    // Name of the configuration.
+    string name = 1;
+    // Name of the device.
+    string device = 2;
+    // Number of devices inside this configuration.
+    int32 num_devices = 3;
+}
+
 // StringStringEntryProto follows the pattern for cross-proto-version maps.
 // See https://developers.google.com/protocol-buffers/docs/proto3#maps
 message StringStringEntryProto {