NameScope interacts poorly with subscoping

System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): Yes
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04 x86_64): macOS x86_64
• TensorFlow installed from (source or binary): source
• TensorFlow version (use command below): 0.5.0-SNAPSHOT
• Java version (i.e., the output of java -version): JDK 11

Describe the current behavior
I'm trying to debug test failures in tensorflow-framework, and noticed that the test sessions use tf = Ops.create(graph).withName("test");. This makes all the nodes have the name "test_" which makes things pretty tricky to debug. I changed it to tf = Ops.create(graph).withSubScope("test");, but now I'm getting test failures out of the optimizers with the following message:

[INFO] Running org.tensorflow.framework.optimizers.FtrlTest
[ERROR] Tests run: 5, Failures: 0, Errors: 4, Skipped: 0, Time elapsed: 0.455 s <<< FAILURE! - in org.tensorflow.framework.optimizers.FtrlTest
[ERROR] testFtrlWithL1  Time elapsed: 0.415 s  <<< ERROR!
java.lang.IllegalArgumentException: invalid name: 'test/var0_gradient_accumulator' does not match the regular expression [A-Za-z0-9.][A-Za-z0-9_.\-]*
	at org.tensorflow.framework.optimizers.FtrlTest.testFtrlWithL1(FtrlTest.java:166)

Describe the expected behavior

No test failures, and test nodes have the correct op names.

Code to reproduce the issue
Make the withSubScope change at line 44 in org.tensorflow.framework.utils.GraphTestSession.

Beginne in Zeile 44 von tensorflow-frameworks GraphTestSession und vergleiche das Verhalten von Ops.withName("test") und Ops.withSubScope("test"). Reproduziere den Fehler in FtrlTest.testFtrlWithL1 in Zeile 166 und untersuche anschließend den generierten Namen sowie die daran beteiligte Namensvalidierung. Erledigt ist die Aufgabe, wenn die Optimizer-Tests erfolgreich durchlaufen und Testknoten debuggbare, gültige Op-Namen behalten.