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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(MergeVertex.java:77)	at org.deeplearning4j.nn.graph.ComputationGraph.feedForward(ComputationGraph.java:984)	at org.deeplearning4j.nn.graph.ComputationGraph.computeGradientAndScore(ComputationGraph.java:890)	at org.deeplearning4j.optimize.solvers.BaseOptimizer.gradientAndScore(BaseOptimizer.java:152)	at org.deeplearning4j.optimize.solvers.StochasticGradientDescent.optimize(StochasticGradientDescent.java:54)	at org.deeplearning4j.optimize.Solver.optimize(Solver.java:51)	at org.deeplearning4j.nn.graph.ComputationGraph.fit(ComputationGraph.java:769)	at org.deeplearning4j.nn.graph.ComputationGraph.fit(ComputationGraph.java:737)	at org.deeplearning4j.nn.graph.ComputationGraph.fit(ComputationGraph.java:612)	at imagenet.ImageNetMain.main(ImageNetMain.java:40)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)