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Cannot do forward pass: inputs not set
java.lang.IllegalStateException: Cannot do forward pass: inputs not set	at org.deeplearning4j.nn.graph.vertex.impl.MergeVertex.doForward(	at org.deeplearning4j.nn.graph.ComputationGraph.feedForward(	at org.deeplearning4j.nn.graph.ComputationGraph.computeGradientAndScore(	at org.deeplearning4j.optimize.solvers.BaseOptimizer.gradientAndScore(	at org.deeplearning4j.optimize.solvers.StochasticGradientDescent.optimize(	at org.deeplearning4j.optimize.Solver.optimize(	at	at	at	at imagenet.ImageNetMain.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at com.intellij.rt.execution.application.AppMain.main(