过去几天我一直在使用h2o和h2o Flow,并且喜欢它。两天前,我从h2o Flow导出了一些模型(二进制格式)并用R导入它们,所以我可以继续深造。它完美地工作到今天。出于某种原因,当我尝试使用h2o.loadModel
函数时(我在使用所有导出的二进制模型之前工作正常),我收到以下错误。为了澄清,我已经成功运行了h2o.init()
命令来打开H2O集群。
ERROR: Unexpected HTTP Status code: 412 Precondition Failed (url = http://localhost:54321/99/Models.bin/)
water.exceptions.H2OIllegalArgumentException
[1] "water.exceptions.H2OIllegalArgumentException: Illegal argument: dir of function: importModel: H2O/H2O-XX/gbm_grid1_m02"
[2] " water.api.ModelsHandler.importModel(ModelsHandler.java:220)"
[3] " sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)"
[4] " sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)"
[5] " sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)"
[6] " java.lang.reflect.Method.invoke(Method.java:498)"
[7] " water.api.Handler.handle(Handler.java:63)"
[8] " water.api.RequestServer.serve(RequestServer.java:446)"
[9] " water.api.RequestServer.doGeneric(RequestServer.java:296)"
[10] " water.api.RequestServer.doPost(RequestServer.java:222)"
[11] " javax.servlet.http.HttpServlet.service(HttpServlet.java:755)"
[12] " javax.servlet.http.HttpServlet.service(HttpServlet.java:848)"
[13] " org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)"
[14] " org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)"
[15] " org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)"
[16] " org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)"
[17] " org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)"
[18] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)"
[19] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)"
[20] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)"
[21] " water.JettyHTTPD$LoginHandler.handle(JettyHTTPD.java:189)"
[22] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)"
[23] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)"
[24] " org.eclipse.jetty.server.Server.handle(Server.java:370)"
[25] " org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)"
[26] " org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)"
[27] " org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)"
[28] " org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)"
[29] " org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)"
[30] " org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)"
[31] " org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)"
[32] " org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)"
[33] " org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)"
[34] " org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)"
[35] " java.lang.Thread.run(Thread.java:748)"
Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, :
ERROR MESSAGE:
Illegal argument: dir of function: importModel: H2O/H2O-XX/gbm_grid1_m02
我在RStudio上使用最新的h2o版本3.15.0.4029,macOS Sierra(10.12.6(16G29))
更新:根据Erin的要求,发布我尝试导入模型的方式:
library(h2o)
#h2o.init(nthreads = -1, max_mem_size = "7G") # Already initiated
#h2o.removeAll()
h2oXX <- h2o.loadModel("H2O-XX/GBM_grid_0_AutoML_20171102_095446_model_41")
降级到最新的稳定版本(h2o-3.14.0.7)并收到相同的错误:Illegal argument: dir of function: importModel: H2O-XX/GBM_grid_0_AutoML_20171102_095446_model_41
附加模型(您可以尝试导入它):bit.ly/h2odemo
如果你看到一个看起来像这样的错误(密钥标识符是这个语句Illegal argument: dir of function: importModel:
)
ERROR: Unexpected HTTP Status code: 412 Precondition Failed (url = http://localhost:54321/99/Models.bin/)
water.exceptions.H2OIllegalArgumentException
[1] "water.exceptions.H2OIllegalArgumentException: Illegal argument: dir of function: importModel: H2O/H2O-XX/gbm_grid1_m02"
那么这可能意味着您使用不同版本的H2O来训练和保存模型,而不是用于加载H2O模型。这是一个问题,因为binary models(使用h2o.saveModel()
函数保存的模型)在不同版本的H2O之间不兼容。
简单的解决方案是使用相同版本的H2O来保存和重新加载模型。
另一种解决方案是使用POJO or MOJO型H2O模型。这种模型格式将模型导出为纯Java代码,并不依赖于特定版本的H2O。当您对测试数据生成预测时,它也不需要运行H2O集群。如果您要将H2O模型投入生产,这通常是您想要使用的。