使用 h2o.randomForest 个已保存模型的预测
Predictions with h2o.randomForest saved model
我已经在 Rstudio 中使用 h2o 库训练了一个随机森林模型，然后将其保存为 .rda 文件，现在我想使用模型构建对其他数据进行评分。
所以我加载了模型，我在 H2OFrame 中转换了新数据集，我尝试使用 predict( model, new_data) 函数获得分数。
我得到的是以下错误消息：
ERROR: Unexpected HTTP Status code: 404 Not Found (url = http://localhost:54321/4/Predictions/models/DRF_model_R_1468754145815_1/frames/file1840210c1889_sid_9b90_2)
water.exceptions.H2OKeyNotFoundArgumentException
[1] "water.exceptions.H2OKeyNotFoundArgumentException: Object 'DRF_model_R_1468754145815_1' not found in function: predict for argument: model"
[2] " water.api.ModelMetricsHandler.predict2(ModelMetricsHandler.java:239)"
[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:62)"
[8] " water.api.RequestServer.handle(RequestServer.java:655)"
[9] " water.api.RequestServer.serve(RequestServer.java:596)"
[10] " water.JettyHTTPD$H2oDefaultServlet.doGeneric(JettyHTTPD.java:745)"
[11] " water.JettyHTTPD$H2oDefaultServlet.doPost(JettyHTTPD.java:681)"
[12] " javax.servlet.http.HttpServlet.service(HttpServlet.java:755)"
[13] " javax.servlet.http.HttpServlet.service(HttpServlet.java:848)"
[14] " org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)"
[15] " org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)"
[16] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)"
[17] " org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)"
[18] " org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)"
[19] " org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)"
[20] " org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)"
[21] " org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)"
[22] " org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)"
[23] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)"
[24] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)"
[25] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)"
[26] " org.eclipse.jetty.server.Server.handle(Server.java:370)"
[27] " org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)"
[28] " org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)"
[29] " org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)"
[30] " org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)"
[31] " org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)"
[32] " org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)"
[33] " org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)"
[34] " org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)"
[35] " org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)"
[36] " org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:543)"
[37] " java.lang.Thread.run(Thread.java:745)"
Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, :
ERROR MESSAGE:
Object 'DRF_model_R_1468754145815_1' not found in function: predict for argument: model
我是 H2O 的新手..知道哪里出了问题吗？
您不能将其从 R 内部保存为 rda 文件。该模型存在于 H2O 集群上，您必须使用 h2o.saveModel() 来保存它。然后 h2o.loadModel() 再次加载它。参见 ?h2o.saveModel 和 ?h2o.loadModel。
顺便说一句，注意函数之间的不对称性：你给 saveModel 一个目录，给 loadModel 一个文件名。 （文件名将是模型 ID。）
我已经在 Rstudio 中使用 h2o 库训练了一个随机森林模型，然后将其保存为 .rda 文件，现在我想使用模型构建对其他数据进行评分。
所以我加载了模型，我在 H2OFrame 中转换了新数据集，我尝试使用 predict( model, new_data) 函数获得分数。
我得到的是以下错误消息：
ERROR: Unexpected HTTP Status code: 404 Not Found (url = http://localhost:54321/4/Predictions/models/DRF_model_R_1468754145815_1/frames/file1840210c1889_sid_9b90_2)
water.exceptions.H2OKeyNotFoundArgumentException
[1] "water.exceptions.H2OKeyNotFoundArgumentException: Object 'DRF_model_R_1468754145815_1' not found in function: predict for argument: model"
[2] " water.api.ModelMetricsHandler.predict2(ModelMetricsHandler.java:239)"
[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:62)"
[8] " water.api.RequestServer.handle(RequestServer.java:655)"
[9] " water.api.RequestServer.serve(RequestServer.java:596)"
[10] " water.JettyHTTPD$H2oDefaultServlet.doGeneric(JettyHTTPD.java:745)"
[11] " water.JettyHTTPD$H2oDefaultServlet.doPost(JettyHTTPD.java:681)"
[12] " javax.servlet.http.HttpServlet.service(HttpServlet.java:755)"
[13] " javax.servlet.http.HttpServlet.service(HttpServlet.java:848)"
[14] " org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)"
[15] " org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)"
[16] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)"
[17] " org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)"
[18] " org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)"
[19] " org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)"
[20] " org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)"
[21] " org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)"
[22] " org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)"
[23] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)"
[24] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)"
[25] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)"
[26] " org.eclipse.jetty.server.Server.handle(Server.java:370)"
[27] " org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)"
[28] " org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)"
[29] " org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)"
[30] " org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)"
[31] " org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)"
[32] " org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)"
[33] " org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)"
[34] " org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)"
[35] " org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)"
[36] " org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:543)"
[37] " java.lang.Thread.run(Thread.java:745)"
Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, :
ERROR MESSAGE:
Object 'DRF_model_R_1468754145815_1' not found in function: predict for argument: model
我是 H2O 的新手..知道哪里出了问题吗？
您不能将其从 R 内部保存为 rda 文件。该模型存在于 H2O 集群上，您必须使用 h2o.saveModel() 来保存它。然后 h2o.loadModel() 再次加载它。参见 ?h2o.saveModel 和 ?h2o.loadModel。
顺便说一句，注意函数之间的不对称性：你给 saveModel 一个目录，给 loadModel 一个文件名。 （文件名将是模型 ID。）