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