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Issue Description\r\nSorry, I'm bad at English. So i use google translation.\r\n\r\nI tried to analyze using SkipGram using yesterday's deeplearning4j latest Snapshot. The following error occurred at that time.\r\n\r\n```\r\nException in thread \"VectorCalculationsThread 0\" java.lang.RuntimeException: java.lang.NullPointerException\r\n\tat org.deeplearning4j.models.sequencevectors.SequenceVectors$VectorCalculationsThread.run(SequenceVectors.java:1340)\r\nCaused by: java.lang.NullPointerException\r\n\tat org.nd4j.jita.allocator.impl.AtomicAllocator.synchronizeHostData(AtomicAllocator.java:350)\r\n\tat org.nd4j.jita.allocator.impl.AtomicAllocator.getHostPointer(AtomicAllocator.java:327)\r\n\tat org.nd4j.linalg.jcublas.ops.executioner.CudaExecutioner.exec(CudaExecutioner.java:2446)\r\n\tat org.deeplearning4j.models.embeddings.learning.impl.elements.SkipGram.iterateSample(SkipGram.java:533)\r\n\tat org.deeplearning4j.models.sequencevectors.SequenceVectors$VectorCalculationsThread.run(SequenceVectors.java:1315)\r\n```\r\n\r\nPerhaps the INDArray instance created by NDArray.empty (DataType dataType) has a data property of null ?\r\nWhen creating an instance of SkipGramRound, I think that you have created an inferenceVector in inputArguments using NDArray.empty (DataType dataType).\r\nIt seems that the NullPointerException has occurred when an INDArray instance whose data property is null passes through method (synchronizeHostData(INDArray array)).\r\n\r\n#### Version Information\r\n\r\nPlease indicate relevant versions, including, if relevant:\r\n\r\n* Deeplearning4j version\r\nyesterday's snapshot\r\n* platform information (OS, etc)\r\nWindows10\r\n* CUDA version, if used\r\nCuda10.0\r\n* NVIDIA driver version, if in use\r\nsorry, I have not confirmed yet\r\n"},"comment":{"url":"https://api.github.com/repos/deeplearning4j/deeplearning4j/issues/comments/478843071","html_url":"https://github.com/deeplearning4j/deeplearning4j/issues/7314#issuecomment-478843071","issue_url":"https://api.github.com/repos/deeplearning4j/deeplearning4j/issues/7314","id":478843071,"node_id":"MDEyOklzc3VlQ29tbWVudDQ3ODg0MzA3MQ==","user":{"login":"raver119","id":12250879,"node_id":"MDQ6VXNlcjEyMjUwODc5","avatar_url":"https://avatars2.githubusercontent.com/u/12250879?v=4","gravatar_id":"","url":"https://api.github.com/users/raver119","html_url":"https://github.com/raver119","followers_url":"https://api.github.com/users/raver119/followers","following_url":"https://api.github.com/users/raver119/following{/other_user}","gists_url":"https://api.github.com/users/raver119/gists{/gist_id}","starred_url":"https://api.github.com/users/raver119/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/raver119/subscriptions","organizations_url":"https://api.github.com/users/raver119/orgs","repos_url":"https://api.github.com/users/raver119/repos","events_url":"https://api.github.com/users/raver119/events{/privacy}","received_events_url":"https://api.github.com/users/raver119/received_events","type":"User","site_admin":false},"created_at":"2019-04-02T04:48:54Z","updated_at":"2019-04-02T04:48:54Z","author_association":"CONTRIBUTOR","body":"Fix was merged yesterday."}}
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