报错情况

报错如下：

16:45:41.463 [main] INFO org.nd4j.nativeblas.Nd4jBlas - Number of threads used for OpenMP BLAS: 6
16:45:41.497 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner - Backend used: [CPU]; OS: [Windows 10]
16:45:41.497 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner - Cores: [12]; Memory: [7.1GB];
16:45:41.497 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner - Blas vendor: [OPENBLAS]
16:45:41.536 [main] INFO org.deeplearning4j.datasets.base.MnistFetcher - Downloading MNIST...
Exception in thread "main" java.io.IOException: Server returned HTTP response code: 403 for URL: https://dl4jdata.blob.core.windows.net/datasets/mnist/train-images-idx3-ubyte.gz
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1900)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
	at org.apache.commons.io.FileUtils.copyURLToFile(FileUtils.java:1506)
	at org.nd4j.common.resources.Downloader.downloadAndExtract(Downloader.java:121)
	at org.nd4j.common.resources.Downloader.downloadAndExtract(Downloader.java:113)
	at org.nd4j.common.resources.Downloader.downloadAndExtract(Downloader.java:94)
	at org.deeplearning4j.datasets.base.MnistFetcher.downloadAndUntar(MnistFetcher.java:149)
	at org.deeplearning4j.datasets.fetchers.MnistDataFetcher.<init>(MnistDataFetcher.java:82)
	at org.deeplearning4j.datasets.iterator.impl.MnistDataSetIterator.<init>(MnistDataSetIterator.java:70)
	at org.deeplearning4j.datasets.iterator.impl.MnistDataSetIterator.<init>(MnistDataSetIterator.java:56)
	at com.example.LogisticRegression.main(LogisticRegression.java:45)

Process finished with exit code 1

解决方法

自己下载好MNIST数据集，然后放入DL4J对应的文件夹下。

可以在Java中运行这行代码查看：

System.out.println(DL4JResources.getDirectory(ResourceType.DATASET, "MNIST").getAbsolutePath());

我的位置如下，仅作参考。

C:\Users\64859\.deeplearning4j\data\MNIST