Richard Zowalla created OPENNLP-1366: ----------------------------------------
Summary: Training of MaxEnt Model with large corpora fails with java.io.UTFDataFormatException Key: OPENNLP-1366 URL: https://issues.apache.org/jira/browse/OPENNLP-1366 Project: OpenNLP Issue Type: Improvement Components: Lemmatizer Affects Versions: 1.9.4 Reporter: Richard Zowalla As written on [dev@opennlp.a.o|[https://lists.apache.org/thread/vc5lfzj81tco703noqxpvy8sfj8fw8b1]], we are working on training a large opennlp maxent model for lemmatizing German texts. We use a wikipedia tree bank from Tübingen. This consumes > 2 TB of RAM during training but will finish after some time. However, writing this model will result in a java.io.UTFDataFormatException However, training such a big model isn't feasable for debugging. Gladly, a similar with a smaller dataset is found on Stackoverflow: [https://stackoverflow.com/questions/70064477/opennlp-lemmatizertrainer-utfdataformatexception-encoded-string-too-long] It contains the OpenNLP CLI command to train a lemmatizer on a much smaller dataset. The stacktrace is raced while writing a String as UTF in DataOutputStream, which has a hard-coded size limitation in the JDK (for reasons behind my knowledge ;)) Stacktrace: {code:java} java.io.UTFDataFormatException: encoded string too long: 383769 bytes at java.base/java.io.DataOutputStream.writeUTF(DataOutputStream.java:364) at java.base/java.io.DataOutputStream.writeUTF(DataOutputStream.java:323) at opennlp.tools.ml.maxent.io.BinaryGISModelWriter.writeUTF(BinaryGISModelWriter.java:71) at opennlp.tools.ml.maxent.io.GISModelWriter.persist(GISModelWriter.java:97) at opennlp.tools.ml.model.GenericModelWriter.persist(GenericModelWriter.java:75) at opennlp.tools.util.model.ModelUtil.writeModel(ModelUtil.java:71) at opennlp.tools.util.model.GenericModelSerializer.serialize(GenericModelSerializer.java:36) at opennlp.tools.util.model.GenericModelSerializer.serialize(GenericModelSerializer.java:29) at opennlp.tools.util.model.BaseModel.serialize(BaseModel.java:597) at opennlp.tools.cmdline.CmdLineUtil.writeModel(CmdLineUtil.java:182) at opennlp.tools.cmdline.lemmatizer.LemmatizerTrainerTool.run(LemmatizerTrainerTool.java:77) at opennlp.tools.cmdline.CLI.main(CLI.java:256) {code} -- This message was sent by Atlassian Jira (v8.20.1#820001)