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#ifndef TENSORFLOW_GRAPH_GRAPH_DEF_BUILDER_H_
#define TENSORFLOW_GRAPH_GRAPH_DEF_BUILDER_H_
#include <vector>
#include "tensorflow/core/framework/graph.pb.h"
#include "tensorflow/core/framework/op.h"
#include "tensorflow/core/graph/graph.h"
#include "tensorflow/core/graph/node_builder.h"
#include "tensorflow/core/public/status.h"
#include "tensorflow/core/lib/core/stringpiece.h"
#include "tensorflow/core/lib/gtl/array_slice.h"
namespace tensorflow {
// Given a function like:
// namespace ops {
// Node* Identity(NodeOut input, const GraphDefBuilder::Options& opts) {
// if (opts.HaveError()) return nullptr;
// static const string kOpName = "Identity";
// NodeBuilder node_builder(opts.GetNameForOp(kOpName), kOpName,
// opts.op_registry());
// node_builder.Input(input);
// return opts.FinalizeBuilder(&node_builder);
// }
// } // namspace ops
//
// // Or, alternatively:
// namespace ops {
// Node* Identity(NodeOut input, const GraphDefBuilder::Options& opts) {
// static const string kOpName = "Identity";
// return UnaryOp(kOpName, input, opts);
// }
// } // namspace ops
//
// You call it like:
// GraphDefBuilder b;
// using namespace ::tensorflow::ops; // NOLINT(build/namespaces)
// Node* a = Const(7, b.opts());
// // Note: WithName() returns a copy, opts is unchanged.
// Node* b = Const(5, b.opts().WithName("control-input"));
// Node* c = Identity(a, b.opts().WithControlInput(b));
// GraphDef graph_def;
// Status status = b.ToGraphDef(&graph_def);
// if (!status.ok()) { /* Handle error */ }
//
// In tests you can skip the status handling via:
// GraphDefBuilder b(GraphDefBuilder::kFailImmediately);
// ...
// b.ToGraphDef(&graph_def);
class GraphDefBuilder {
public:
// Options for adding a Node to a Graph.
class Options {
public:
// Sets the Graph (that Nodes will be added to) and the status. The
// status may be set to nullptr, in which case errors cause CHECK
// failures. The graph and status must outlive *this.
Options(Graph* graph, Status* status);
~Options();
// Methods for setting options. These are const methods: they
// return a copy of *this with the option set.
Options WithName(StringPiece name) const;
Options WithDevice(StringPiece device) const;
Options WithControlInput(Node* control_input) const;
Options WithControlInputs(gtl::ArraySlice<Node*> control_inputs) const;
// Override the default value for an optional attr.
template <class T>
Options WithAttr(StringPiece attr_name, T&& value) const {
return Options(*this).WithAttrImpl(attr_name, std::forward<T>(value));
}
// Note: overload needed to allow {...} expressions for value.
template <class T>
Options WithAttr(StringPiece attr_name,
std::initializer_list<T> value) const {
return WithAttr<std::initializer_list<T>>(attr_name, std::move(value));
}
// Methods for using options from a function that creates a Node.
// Returns true if the status associated with *this has an error.
// Use this to skip processing that may depend on prior results.
bool HaveError() const { return status_ != nullptr && !status_->ok(); }
// Given the Op type name, return a name for a node of that type.
// Uses the value set in WithName() if that has been called. Otherwise,
// returns a name built out of the Op type name.
string GetNameForOp(StringPiece op) const;
// Sets the device, adds control inputs, adds attrs, and calls Finalize().
// If Finalize returns an error, it is saved and this function returns
// nullptr.
Node* FinalizeBuilder(NodeBuilder* builder) const;
// Updates the associated status, if any, or calls TF_CHECK_OK if none.
void UpdateStatus(const Status& status) const;
// Accessor
const OpRegistryInterface* op_registry() const {
return graph_->op_registry();
}
private:
Options WithNameImpl(StringPiece name);
Options WithDeviceImpl(StringPiece device);
Options WithControlInputImpl(Node* control_input);
Options WithControlInputsImpl(gtl::ArraySlice<Node*> control_inputs);
template <class T>
Options WithAttrImpl(StringPiece name, T&& value) {
attrs_.emplace_back(name.ToString(), AttrValue());
SetAttrValue(std::forward<T>(value), &attrs_.back().second);
return *this;
}
Graph* const graph_;
Status* const status_;
string name_;
string device_;
std::vector<Node*> control_inputs_;
std::vector<std::pair<string, AttrValue>> attrs_;
};
// Start building a new graph.
explicit GraphDefBuilder(
const OpRegistryInterface* op_registry = OpRegistry::Global())
: graph_(op_registry), opts_(&graph_, &status_) {}
// For use in tests, where you want to fail immediately on error instead
// of checking the status at the end.
enum TestFailImmediatelyType { kFailImmediately };
explicit GraphDefBuilder(
TestFailImmediatelyType,
const OpRegistryInterface* op_registry = OpRegistry::Global())
: graph_(op_registry), opts_(&graph_, nullptr) {}
// Gets the Options with the associated Graph and Status.
const Options& opts() const { return opts_; }
// Once all the nodes have been added, call this to get whether it was
// successful, and if so fill *graph_def.
Status ToGraphDef(GraphDef* graph_def) const;
// Like ToGraphDef(), but converts to a Graph (using the default
// GraphConstructorOptions).
// TODO(josh11b): Make this faster; right now it converts
// Graph->GraphDef->Graph. This cleans up the graph (e.g. adds
// edges from the source and to the sink node, resolves back edges
// by name), and makes sure the resulting graph is valid.
Status ToGraph(Graph* graph) const;
private:
Graph graph_;
Status status_;
Options opts_;
};
namespace ops {
// A NodeOut may either be a regular input or back input. Regular
// inputs are specified via either a Node* or a Node* and an output
// index. Back inputs are specified by a node name, output index, and
// output type.
typedef NodeBuilder::NodeOut NodeOut;
// For adding an Op with no inputs to a GraphDefBuilder.
Node* SourceOp(const string& op_name, const GraphDefBuilder::Options& opts);
// For adding an Op with one input to a GraphDefBuilder.
Node* UnaryOp(const string& op_name, NodeOut input,
const GraphDefBuilder::Options& opts);
// For adding an Op with two inputs to a GraphDefBuilder.
Node* BinaryOp(const string& op_name, NodeOut a, NodeOut b,
const GraphDefBuilder::Options& opts);
} // namespace ops
} // namespace tensorflow
#endif // TENSORFLOW_GRAPH_GRAPH_DEF_BUILDER_H_
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