Nicer error messages for mode-forbidden ops (#169)

* start fobbiden ops checks

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

* fix style

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

* move checks to builder method

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

Author: rnett

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

@@ -75,15 +75,15 @@ public EagerOperation build() {
 
   @Override
   public EagerOperationBuilder addInput(Output<?> input) {
-    addInput(opHandle, (TFE_TensorHandle)input.getUnsafeNativeHandle());
+    addInput(opHandle, (TFE_TensorHandle) input.getUnsafeNativeHandle());
     return this;
   }
 
   @Override
   public EagerOperationBuilder addInputList(Output<?>[] inputs) {
     TFE_TensorHandle[] inputHandles = new TFE_TensorHandle[inputs.length];
     for (int i = 0; i < inputs.length; ++i) {
-      inputHandles[i] = (TFE_TensorHandle)inputs[i].getUnsafeNativeHandle();
+      inputHandles[i] = (TFE_TensorHandle) inputs[i].getUnsafeNativeHandle();
     }
     addInputList(opHandle, inputHandles);
     return this;
@@ -226,7 +226,9 @@ public EagerOperationBuilder setAttr(String name, Shape[] values) {
   private final String type;
   private final String name;
 
-  /** This value should be >= to the maximum number of outputs in any op */
+  /**
+   * This value should be >= to the maximum number of outputs in any op
+   */
   private static final int MAX_OUTPUTS_PER_OP = 1000;
 
   private static void requireOp(TFE_Op handle) {
@@ -358,7 +360,7 @@ private static void setAttrFloatList(TFE_Op opHandle, String name, float[] value
 
   private static void setAttrBool(TFE_Op opHandle, String name, boolean value) {
     requireOp(opHandle);
-    TFE_OpSetAttrBool(opHandle, name, (byte)(value ? 1 : 0));
+    TFE_OpSetAttrBool(opHandle, name, (byte) (value ? 1 : 0));
   }
 
   private static void setAttrBoolList(TFE_Op opHandle, String name, boolean[] values) {
@@ -410,7 +412,7 @@ private static void setAttrShapeList(TFE_Op opHandle, String name, long[] shapes
       }
       TF_Status status = TF_Status.newStatus();
       TFE_OpSetAttrShapeList(opHandle, new BytePointer(name), shapesPointers, new IntPointer(numDims),
-                            numDims.length, status);
+          numDims.length, status);
     }
   }
 }

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

@@ -27,6 +27,9 @@
 import org.tensorflow.internal.c_api.TFE_Context;
 import org.tensorflow.internal.c_api.TFE_ContextOptions;
 import org.tensorflow.internal.c_api.TF_Status;
+import org.tensorflow.op.core.Assign;
+import org.tensorflow.op.core.Placeholder;
+import org.tensorflow.op.core.Variable;
 import org.tensorflow.proto.framework.ConfigProto;
 
 /**
@@ -271,6 +274,9 @@ static void closeDefaultForTest() {
   @Override
   public OperationBuilder opBuilder(String type, String name) {
     checkSession();
+    if (!isOpEnabled(type)) {
+      throw new IllegalArgumentException("Op " + type + " is not valid in eager mode.");
+    }
     return new EagerOperationBuilder(this, type, name);
   }
 
@@ -279,6 +285,18 @@ public Types environmentType() {
     return Types.EAGER;
   }
 
+  @Override
+  public boolean isOpEnabled(String opType) {
+    switch (opType) {
+      case Variable.OP_NAME:
+      case Placeholder.OP_NAME:
+      case Assign.OP_NAME:
+        return false;
+      default:
+        return true;
+    }
+  }
+
   TFE_Context nativeHandle() {
     checkSession();
     return nativeHandle;

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

@@ -34,6 +34,15 @@ enum Types {
    */
   OperationBuilder opBuilder(String type, String name);
 
+  /**
+   * Returns true if the given operation is valid in this execution environment.
+   * @param opType The op to check.
+   * @return Whether the given operation is valid in this execution environment.
+   */
+  default boolean isOpEnabled(String opType){
+    return true;
+  }
+
   /**
    * Get the type of this environment (from the `Environments` enumeration.
    *

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

@@ -147,6 +147,9 @@ public Iterator<Operation> operations() {
    */
   @Override
   public GraphOperationBuilder opBuilder(String type, String name) {
+    if (!isOpEnabled(type)) {
+      throw new IllegalArgumentException("Op " + type + " is not valid in graph mode.");
+    }
     return new GraphOperationBuilder(this, type, name);
   }
 

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

@@ -54,7 +54,9 @@
 import org.tensorflow.ndarray.Shape;
 import org.tensorflow.proto.framework.DataType;
 
-/** An {@link OperationBuilder} for adding {@link GraphOperation}s to a {@link Graph}. */
+/**
+ * An {@link OperationBuilder} for adding {@link GraphOperation}s to a {@link Graph}.
+ */
 public final class GraphOperationBuilder implements OperationBuilder {
 
   GraphOperationBuilder(Graph graph, String type, String name) {
@@ -103,7 +105,7 @@ public GraphOperationBuilder addControlInput(Operation control) {
   public GraphOperationBuilder addInput(Output<?> input) {
     Graph.Reference r = graph.ref();
     try {
-      addInput(unsafeNativeHandle, (TF_Operation)input.getUnsafeNativeHandle(), input.index());
+      addInput(unsafeNativeHandle, (TF_Operation) input.getUnsafeNativeHandle(), input.index());
     } finally {
       r.close();
     }
@@ -117,7 +119,7 @@ public GraphOperationBuilder addInputList(Output<?>[] inputs) {
       TF_Operation[] opHandles = new TF_Operation[inputs.length];
       int[] indices = new int[inputs.length];
       for (int i = 0; i < inputs.length; ++i) {
-        opHandles[i] = (TF_Operation)inputs[i].getUnsafeNativeHandle();
+        opHandles[i] = (TF_Operation) inputs[i].getUnsafeNativeHandle();
         indices[i] = inputs[i].index();
       }
       addInputList(unsafeNativeHandle, opHandles, indices);
@@ -444,7 +446,7 @@ private static void setAttrFloatList(TF_OperationDescription handle, String name
 
   private static void setAttrBool(TF_OperationDescription handle, String name, boolean value) {
     requireHandle(handle);
-    TF_SetAttrBool(handle, name, (byte)(value ? 1 : 0));
+    TF_SetAttrBool(handle, name, (byte) (value ? 1 : 0));
   }
 
   private static void setAttrBoolList(TF_OperationDescription handle, String name, boolean[] value) {