Initialization imprvements (#178)

* No-op on initAdd in eager mode

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* runInit() method in session

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* add doInitialization() to Runner

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* fix javadoc

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* assume only graph or eager environments

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* Remove doInit(), update javadocs

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

* small fixes

Signed-off-by: Ryan Nett <rnett@calpoly.edu>

Author: rnett

tensorflow-core/tensorflow-core-api/src/gen/annotations/org/tensorflow/op/Ops.java

@@ -347,10 +347,10 @@ public final class Ops {
 
   public final SignalOps signal;
 
-  public final QuantizationOps quantization;
-
   public final TrainOps train;
 
+  public final QuantizationOps quantization;
+
   private final Scope scope;
 
   private Ops(Scope scope) {
@@ -372,8 +372,8 @@ private Ops(Scope scope) {
     math = new MathOps(this);
     audio = new AudioOps(this);
     signal = new SignalOps(this);
-    quantization = new QuantizationOps(this);
     train = new TrainOps(this);
+    quantization = new QuantizationOps(this);
   }
 
   /**
@@ -2755,11 +2755,10 @@ public Init init() {
    *
    *  <p>Registered initializers are then grouped as a single unit of computation by adding
    *  and executing an {@link org.tensorflow.op.core.Init#create(Scope) init} operation from a graph
-   *  session.
+   *  session.  This is a no-op if executed in an eager session.
    *
    * @param scope
    * @param initializer
-   * @throws IllegalArgumentException if the execution environment in scope is not a graph
    * @see org.tensorflow.op.core.Init#create(Scope) init
    */
   public void initAdd(Op initializer) {

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

@@ -490,6 +490,19 @@ public void run(Op op) {
     runner().addTarget(op.op()).run();
   }
 
+
+  /**
+   * Execute the graph's initializers.
+   *
+   * <p>This method is equivalent to {@code session.run(Ops.create(session.graph).init())}.
+   *
+   */
+  public void runInit(){
+    Runner runner = runner();
+    graph.initializers().forEach(runner::addTarget);
+    runner.run();
+  }
+
   /**
    * Saves the actual state of the variables of this session's graph.
    *

tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/op/core/Init.java

@@ -89,21 +89,19 @@ public static Init create(Scope scope) {
    *
    * <p>Registered initializers are then grouped as a single unit of computation by adding
    * and executing an {@link org.tensorflow.op.core.Init#create(Scope) init} operation from a graph
-   * session.
+   * session.  This is a no-op if executed in an eager session.
    *
    * @param scope
    * @param initializer
-   * @throws IllegalArgumentException if the execution environment in scope is not a graph
    * @see org.tensorflow.op.core.Init#create(Scope) init
    */
   @Endpoint(name = "initAdd")
   public static void add(Scope scope, Op initializer) {
     ExecutionEnvironment exEnv = scope.env();
-    if (!(exEnv instanceof Graph)) {
-      throw new IllegalArgumentException("initAdd is only supported on Graph sessions.");
+
+    if (exEnv.isGraph()) {
+      ((Graph) exEnv).addInitializer(initializer);
     }
-    Graph graph = (Graph) exEnv;
-    graph.addInitializer(initializer);
   }
 
   private Init(Operation operation) {