| Name | Description | Type | Package | Framework |
| AbstractDataIndexer | Abstract class for collecting event and context counts used in training. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| AbstractModel | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| AbstractModel .ModelType | | Class | opennlp.tools.ml.model.AbstractModel | Natural Language Processing (OpenNLP) |
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| AbstractModelReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| AbstractModelWriter | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| BinaryFileDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| ComparableEvent | A maxent event representation which we can use to sort based on the predicates indexes contained in the events. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| ComparablePredicate | A maxent predicate representation which we can use to sort based on the outcomes. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| Context | Class which associates a real valued parameter or expected value with a particular contextual predicate or feature. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| DataIndexer | Object which compresses events in memory and performs feature selection. | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| DataReader | | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| DynamicEvalParameters | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| EvalParameters | This class encapsulates the varibales used in producing probabilities from a model and facilitaes passing these variables to the eval method. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| Event | The context of a decision point during training. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| FileEventStream | Class for using a file of events as an event stream. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| GenericModelReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| GenericModelWriter | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| HashSumEventStream | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| IndexHashTable | The IndexHashTable is a hash table which maps entries of an array to their index in the array. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| MaxentModel | Interface for maximum entropy models. | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| MutableContext | Class used to store parameters or expected values associated with this context which can be updated or assigned. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| ObjectDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| OnePassDataIndexer | An indexer for maxent model data which handles cutoffs for uncommon contextual predicates and provides a unique integer index for each of the | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| OnePassRealValueDataIndexer | An indexer for maxent model data which handles cutoffs for uncommon contextual predicates and provides a unique integer index for each of the | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| PlainTextFileDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| Prior | This interface allows one to implement a prior distribution for use in maximum entropy model training. | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| RealValueFileEventStream | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| Sequence | Class which models a sequence. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| SequenceClassificationModel | A classification model that can label an input sequence. | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| SequenceStream | Interface for streams of sequences used to train sequence models. | Interface | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| SequenceStreamEventStream | Class which turns a sequence stream into an event stream. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| TrainUtil | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| TwoPassDataIndexer | Collecting event and context counts by making two passes over the events. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| UniformPrior | Provide a maximum entropy model with a uniform prior. | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |