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Shajanshajandasan
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karllessard
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Draft: Java API to use tf.function available on SavedModel. (#89)
Python models that contain tf.function is inconvenient to be consumed by Java clients. This proposal provides an API to (a) Invoke a tf.function, given the signature name (b) Retrieve the node name in the graph corresponding to a tf.function Co-authored-by: Shajan Dasan <[email protected]>
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‎tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/SavedModelBundle.java

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import static org.tensorflow.internal.c_api.global.tensorflow.TF_SetConfig;
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import com.google.protobuf.InvalidProtocolBufferException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.stream.Collectors;
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import org.bytedeco.javacpp.BytePointer;
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import org.bytedeco.javacpp.PointerPointer;
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import org.bytedeco.javacpp.PointerScope;
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import org.tensorflow.proto.framework.ConfigProto;
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import org.tensorflow.proto.framework.MetaGraphDef;
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import org.tensorflow.proto.framework.RunOptions;
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import org.tensorflow.proto.framework.SignatureDef;
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/**
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* SavedModelBundle represents a model loaded from storage.
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private RunOptions runOptions = null;
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}
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/**
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* SignatureToNodeName finds the node names in the {@link Graph} corresponding to the
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* input / output parameters of a <a
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* href="https://www.tensorflow.org/api_docs/python/tf/function">tf.function</a>
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*/
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public static final class SignatureToNodeName {
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public SignatureToNodeName(SavedModelBundle savedModelBundle) {
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loadSignatures(savedModelBundle);
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}
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/**
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* Given a tf.function signature name, find the node names corresponding
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* to the input arguments
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*
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* @param functionSignatureName tf.function signature name
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* @return a map from input arguments to node names in the {@link Graph}
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*/
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public Map<String, String> inputNameToNode(String functionSignatureName) {
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NameContainer nc = this.functionMap.get(functionSignatureName);
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return (nc == null) ? null : nc.inputNameToNode();
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}
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/**
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* Given a tf.function signature name, find the node names corresponding
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* to the output arguments
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*
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* @param functionSignatureName tf.function signature name
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* @return a map from output arguments to node names in the {@link Graph}
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*/
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public Map<String, String> outputNameToNode(String functionSignatureName) {
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NameContainer nc = this.functionMap.get(functionSignatureName);
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return (nc == null) ? null : nc.outputNameToNode();
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}
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/**
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* Given a tf.function signature name, find the method name
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*/
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public String methodName(String functionSignatureName) {
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NameContainer nc = this.functionMap.get(functionSignatureName);
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return (nc == null) ? null : nc.methodName();
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}
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private void loadSignatures(SavedModelBundle savedModelBundle) {
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MetaGraphDef metaGraph = savedModelBundle.metaGraphDef();
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Map<String, SignatureDef> signatureMap = metaGraph.getSignatureDefMap();
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// A saved model can contain multiple SignatureDef
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for (Map.Entry<String, SignatureDef> entry : signatureMap.entrySet()) {
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NameContainer nc = new NameContainer(entry.getValue());
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this.functionMap.put(entry.getKey(), nc);
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}
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}
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private Map<String, NameContainer> functionMap = new HashMap<>();
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private static final class NameContainer {
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NameContainer(SignatureDef sd) {
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this.inputNameToNodeName = sd.getInputsMap()
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.entrySet()
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.stream()
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.collect(Collectors.toMap(
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e -> e.getKey(),
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e -> e.getValue().getName()
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));
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this.outputNameToNodeName = sd.getOutputsMap()
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.entrySet()
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.stream()
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.collect(Collectors.toMap(
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e -> e.getKey(),
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e -> e.getValue().getName()
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));
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this.method = sd.getMethodName();
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}
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public Map<String, String> inputNameToNode() {
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return this.inputNameToNodeName;
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}
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public Map<String, String> outputNameToNode() {
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return this.outputNameToNodeName;
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}
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public String methodName() {
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return this.method;
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}
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private Map<String, String> inputNameToNodeName;
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private Map<String, String> outputNameToNodeName;
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private String method;
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}
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}
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/**
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* Load a saved model from an export directory. The model that is being loaded should be created
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* using the <a href="https://www.tensorflow.org/api_docs/python/tf/saved_model">Saved Model
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return session;
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}
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/**
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* Returns the {@link SignatureToNodeName} translator for the model.
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*
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* @return SignatureToNodeName translator
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*/
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public SignatureToNodeName getSignatureToNodeName() {
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if (this.sigToNodeName == null) {
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// no need to lock, ok to create multiple instances
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this.sigToNodeName = new SignatureToNodeName(this);
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}
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return this.sigToNodeName;
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}
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/**
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* Return a {@link TfFunction} corresponding to the function signature.
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*
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* <pre>{@code
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* TfFunction myFunction = savedModelBundle.function("myFunctionSignatureName");
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* Map<String, Tensor<?>> outputTensorMap = myFunction.call(inputTensorMap);
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* }</pre>
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*
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* @param functionSignatureName name of the {@code SignatureDef} in the saved model.
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* @return TfFunction object that can be used to make calls to the tf.function
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*/
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public TfFunction function(String functionSignatureName) {
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return new TfFunction(functionSignatureName, this.getSignatureToNodeName(), this.session);
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}
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/**
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* Releases resources (the {@link Graph} and {@link Session}) associated with the saved model
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* bundle.
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private final Graph graph;
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private final Session session;
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private final MetaGraphDef metaGraphDef;
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private SignatureToNodeName sigToNodeName;
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private SavedModelBundle(Graph graph, Session session, MetaGraphDef metaGraphDef) {
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this.graph = graph;

‎tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/TfFunction.java

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/*
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* Copyright 2020 The TensorFlow Authors. All rights reserved.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 org.tensorflow;
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import com.google.protobuf.InvalidProtocolBufferException;
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import java.util.List;
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import java.util.ListIterator;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Invoke <a href="https://www.tensorflow.org/api_docs/python/tf/function">tf.function</a>
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* defined in a {@link SavedModelBundle}.
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*
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* <pre>{@code
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* TfFunction myFunction = savedModelBundle.function("myFunctionSignatureName");
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* Map<String, Tensor<?>> outputTensorMap = myFunction.call(inputTensorMap);
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* }</pre>
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*
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*/
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public class TfFunction {
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public TfFunction(
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String functionSignatureName,
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SavedModelBundle.SignatureToNodeName nameToNode, Session session) {
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this.nameToNode = nameToNode;
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this.session = session;
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this.functionSignatureName = functionSignatureName;
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}
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/**
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* Invokes a tf.function.
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* Caller is responsible for closing all Tensors.
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*
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* @param arguments map of input tensors
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* @return map of output tensors
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*/
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public Map<String, Tensor<?>> call(
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Map<String, Tensor<?>> arguments) throws IllegalArgumentException {
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Session.Runner runner = this.session.runner();
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Map<String, String> inputToNode = this.nameToNode.inputNameToNode(this.functionSignatureName);
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if (inputToNode == null) {
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throw new IllegalArgumentException(
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String.format("Function [%s] is missing input", this.functionSignatureName));
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}
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// Join arguments.key, inputToNodeName.key
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for (Map.Entry<String, String> entry: inputToNode.entrySet()) {
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String argName = entry.getKey();
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Tensor<?> tensor = arguments.get(argName);
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if (tensor == null) {
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throw new IllegalArgumentException(String.format("Missing argument [%s]", argName));
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}
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// Node name in the tensorflow graph, corresponding to the tf.function argument
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runner = runner.feed(entry.getValue(), tensor);
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}
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Map<String, String> outputToNode = this.nameToNode.outputNameToNode(this.functionSignatureName);
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if (outputToNode == null) {
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throw new IllegalArgumentException(
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String.format("Function [%] is missing output", this.functionSignatureName));
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}
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for (String nodeName: outputToNode.values()) {
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// Node names corresponding to the return value
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runner = runner.fetch(nodeName);
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}
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List<Tensor<?>> resultTensors = runner.run();
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ListIterator<Tensor<?>> resultTensorIter = resultTensors.listIterator();
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Map<String, Tensor<?>> returnMap = new HashMap<String, Tensor<?>>();
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// Use the output names as present in the signature definition
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for (String nodeName: outputToNode.keySet()) {
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returnMap.put(nodeName, resultTensorIter.next());
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}
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return returnMap;
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}
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/**
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* Invokes a tf.function.
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* Caller is responsible for closing all Tensors.
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*
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* Throws IllegalArgumentException if there are multiple input or output parameters defined
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* in the tf.function
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*
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* @param tensor input tensor
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* @return output tensor
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*/
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public Tensor<?> call(Tensor<?> tensor) throws IllegalArgumentException {
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Session.Runner runner = this.session.runner();
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Map<String, String> inputToNode = this.nameToNode.inputNameToNode(this.functionSignatureName);
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if (inputToNode == null) {
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throw new IllegalArgumentException(
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String.format("Function [%s] is missing input", this.functionSignatureName));
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}
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if (inputToNode.size() != 1) {
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throw new IllegalArgumentException(
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String.format("Function [%s] requires multiple inputs", this.functionSignatureName));
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}
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// Feed the single argument
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for (Map.Entry<String, String> entry: inputToNode.entrySet()) {
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// Node name in the tensorflow graph, corresponding to the tf.function argument
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runner = runner.feed(entry.getValue(), tensor);
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}
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Map<String, String> outputToNode = this.nameToNode.outputNameToNode(this.functionSignatureName);
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if (outputToNode == null) {
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throw new IllegalArgumentException(
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String.format("Function [%] is missing output", this.functionSignatureName));
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}
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if (outputToNode.size() != 1) {
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throw new IllegalArgumentException(
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String.format("Function [%s] has multiple outputs", this.functionSignatureName));
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}
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// Fetch the single return tensor
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for (String nodeName: outputToNode.values()) {
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// Node names corresponding to the return value
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runner = runner.fetch(nodeName);
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}
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List<Tensor<?>> resultTensors = runner.run();
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return resultTensors.get(0);
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}
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private final Session session;
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private final SavedModelBundle.SignatureToNodeName nameToNode;
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private final String functionSignatureName;
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}

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