Go: Add a SavedModel type

Change: 147543652

1 files changed, 68 insertions, 0 deletions

diff --git a/tensorflow/go/saved_model.go b/tensorflow/go/saved_model.go
new file mode 100644
index 0000000000..9bffa61765
--- /dev/null
+++ b/tensorflow/go/saved_model.go
@@ -0,0 +1,68 @@
+// Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package tensorflow
+
+import (
+	"runtime"
+	"unsafe"
+)
+
+// #include <stdlib.h>
+// #include "tensorflow/c/c_api.h"
+import "C"
+
+// SavedModel represents the contents of loaded SavedModel.
+// TODO(jhseu): Add and document metagraphdef when we pregenerate protobufs.
+type SavedModel struct {
+	Session *Session
+	Graph   *Graph
+}
+
+// LoadSavedModel creates a new SavedModel from a model previously
+// exported to a directory on disk.
+//
+// Exported models contain a set of graphs and, optionally, variable values.
+// Tags in the model identify a single graph. LoadSavedModel initializes a
+// session with the identified graph and with variables initialized to from the
+// checkpoints on disk.
+//
+// The tensorflow package currently does not have the ability to export a model
+// to a directory from Go. This function thus currently targets loading models
+// exported in other languages, such as using tf.saved_model.builder in Python.
+// See:
+// https://www.tensorflow.org/code/tensorflow/python/saved_model/
+func LoadSavedModel(exportDir string, tags []string, options *SessionOptions) (*SavedModel, error) {
+	status := newStatus()
+	cOpt := options.c()
+	cExportDir := C.CString(exportDir)
+	cTags := make([]*C.char, len(tags))
+	for i := range tags {
+		cTags[i] = C.CString(tags[i])
+	}
+	graph := NewGraph()
+	// TODO(jhseu): Add support for run_options and meta_graph_def.
+	cSess := C.TF_LoadSessionFromSavedModel(cOpt, nil, cExportDir, (**C.char)(unsafe.Pointer(&cTags[0])), C.int(len(cTags)), graph.c, nil, status.c)
+	for i := range cTags {
+		C.free(unsafe.Pointer(cTags[i]))
+	}
+	C.free(unsafe.Pointer(cExportDir))
+	C.TF_DeleteSessionOptions(cOpt)
+
+	if err := status.Err(); err != nil {
+		return nil, err
+	}
+	s := &Session{c: cSess}
+	runtime.SetFinalizer(s, func(s *Session) { s.Close() })
+	return &SavedModel{Session: s, Graph: graph}, nil
+}