2020-02-03 16:41:07,242 : WARN : KNIME-Worker-14-Keras Network Learner 0:428 : : DLKnimeNetworkTrainingInputPreparer : Keras Network Learner : 0:428 : The number of rows of the input training data table (10112) is not a multiple of the selected training batch size (256). Thus, the last batch of each epoch will continue at the beginning of the training data table after reaching its end. You can avoid that by adjusting the number of rows of the table or the batch size if desired. 2020-02-03 16:41:11,729 : WARN : Thread-42 : : PythonKernel : Keras Network Learner : 0:428 : /Users/rishi/opt/anaconda3/envs/py3_knime_dl/lib/python3.6/site-packages/keras/engine/saving.py:292: UserWarning: No training configuration found in save file: the model was *not* compiled. Compile it manually. 2020-02-03 16:41:17,199 : ERROR : KNIME-Worker-14-Keras Network Learner 0:428 : : DLKerasLearnerNodeModel : Keras Network Learner : 0:428 : java.lang.Exception: Failed to receive message from Python or forward received message. 2020-02-03 16:41:17,200 : ERROR : KNIME-Worker-14-Keras Network Learner 0:428 : : Node : Keras Network Learner : 0:428 : Execute failed: An error occured during training of the Keras deep learning network. See log for details. java.lang.RuntimeException: An error occured during training of the Keras deep learning network. See log for details. at org.knime.dl.keras.base.nodes.learner.DLKerasLearnerNodeModel.handleGeneralException(DLKerasLearnerNodeModel.java:720) at org.knime.dl.keras.base.nodes.learner.DLKerasLearnerNodeModel.executeInternal(DLKerasLearnerNodeModel.java:696) at org.knime.dl.keras.base.nodes.learner.DLKerasLearnerNodeModel.execute(DLKerasLearnerNodeModel.java:303) at org.knime.core.node.NodeModel.executeModel(NodeModel.java:574) at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1229) at org.knime.core.node.Node.execute(Node.java:1016) at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:557) at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:95) at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:218) at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:124) at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:334) at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:210) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123) at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246) Caused by: java.io.IOException: java.lang.Exception: Failed to receive message from Python or forward received message. at org.knime.dl.python.core.DLPythonAbstractCommands.trainNetwork(DLPythonAbstractCommands.java:519) at org.knime.dl.python.core.training.DLPythonAbstractNetworkTrainingSession.trainInternal(DLPythonAbstractNetworkTrainingSession.java:177) at org.knime.dl.core.training.DLAbstractNetworkTrainingSession.run(DLAbstractNetworkTrainingSession.java:273) at org.knime.dl.keras.base.nodes.learner.DLKerasLearnerNodeModel.executeInternal(DLKerasLearnerNodeModel.java:689) ... 14 more Suppressed: org.knime.dl.core.DLUncheckedException: An exception occured while cleaning up Python. Cause: Failed to clean up Python. See log for details. at org.knime.dl.python.core.DLPythonDefaultContext.close(DLPythonDefaultContext.java:228) at org.knime.dl.python.core.DLPythonAbstractCommands.close(DLPythonAbstractCommands.java:536) at org.knime.dl.python.core.training.DLPythonAbstractNetworkTrainingSession.close(DLPythonAbstractNetworkTrainingSession.java:156) at org.knime.dl.keras.base.nodes.learner.DLKerasLearnerNodeModel.executeInternal(DLKerasLearnerNodeModel.java:692) ... 14 more Caused by: org.knime.python2.kernel.PythonKernelCleanupException: Failed to clean up Python. See log for details. at org.knime.python2.kernel.PythonKernel.close(PythonKernel.java:1368) at org.knime.dl.python.core.DLPythonDefaultContext.close(DLPythonDefaultContext.java:226) ... 17 more Caused by: java.lang.Exception: Failed to receive message from Python or forward received message. at org.knime.python2.kernel.messaging.AbstractMessageLoop.throwExceptionInLoop(AbstractMessageLoop.java:76) at org.knime.python2.kernel.messaging.DefaultMessageReceiverLoop.loop(DefaultMessageReceiverLoop.java:98) at org.knime.python2.kernel.messaging.AbstractMessageLoop.doLoop(AbstractMessageLoop.java:175) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Suppressed: java.lang.Exception: Failed to distribute message from Python. Cause: Message receiver loop terminated. at org.knime.python2.kernel.messaging.AbstractMessageLoop.throwExceptionInLoop(AbstractMessageLoop.java:76) at org.knime.python2.kernel.messaging.MessageDistributorLoop.loop(MessageDistributorLoop.java:93) ... 4 more Caused by: java.io.IOException: Message receiver loop terminated. at org.knime.python2.kernel.messaging.DefaultMessageReceiverLoop.receive(DefaultMessageReceiverLoop.java:82) at org.knime.python2.kernel.messaging.MessageDistributorLoop.loop(MessageDistributorLoop.java:82) ... 4 more [CIRCULAR REFERENCE:java.lang.Exception: Failed to distribute message from Python. Cause: Message receiver loop terminated.] Caused by: java.io.EOFException at java.io.DataInputStream.readFully(DataInputStream.java:197) at java.io.DataInputStream.readFully(DataInputStream.java:169) at org.knime.python2.kernel.messaging.PythonMessagingUtils.readInt(PythonMessagingUtils.java:91) at org.knime.python2.kernel.messaging.DefaultMessageReceiver.receive(DefaultMessageReceiver.java:80) at org.knime.python2.kernel.messaging.DefaultMessageReceiverLoop.loop(DefaultMessageReceiverLoop.java:92) ... 4 more [CIRCULAR REFERENCE:java.lang.Exception: Failed to receive message from Python or forward received message.]