| 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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| AbstractEventModelSequenceTrainer | | Class | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| AbstractEventTrainer | | Class | opennlp.tools.ml | 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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| AbstractSequenceTrainer | | Class | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| AbstractTrainer | | Class | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| ArrayMath | Utility class for simple vector arithmetic. | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| BasicContextGenerator | Generate contexts for maxent decisions, assuming that the input given to the getContext() method is a String containing contextual | Class | opennlp.tools.ml.maxent | Natural Language Processing (OpenNLP) |
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| BeamSearch | Performs k-best search over sequence. | Class | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| BinaryFileDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| BinaryGISModelReader | A reader for GIS models stored in binary format. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| BinaryGISModelWriter | Model writer that saves models in binary format. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| BinaryPerceptronModelReader | | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| BinaryPerceptronModelWriter | Model writer that saves models in binary format. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| BinaryQNModelReader | A reader for quasi-newton models stored in binary format. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| BinaryQNModelWriter | | Class | opennlp.tools.ml.maxent.io | 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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| ContextGenerator | Generate contexts for maxent decisions. | Interface | opennlp.tools.ml.maxent | 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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| DataStream | A interface for objects which can deliver a stream of training data to be supplied to an EventStream. | Interface | opennlp.tools.ml.maxent | 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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| EventModelSequenceTrainer | | Interface | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| EventTrainer | | Interface | opennlp.tools.ml | 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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| Function | | Interface | opennlp.tools.ml.maxent.quasinewton | 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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| GIS | | Class | opennlp.tools.ml.maxent | Natural Language Processing (OpenNLP) |
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| GISModel | A maximum entropy model which has been trained using the Generalized Iterative Scaling procedure (implemented in GIS. | Class | opennlp.tools.ml.maxent | Natural Language Processing (OpenNLP) |
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| GISModelReader | Abstract parent class for readers of GISModels. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| GISModelWriter | Abstract parent class for GISModel writers. | Class | opennlp.tools.ml.maxent.io | 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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| IntegerPool | A pool of read-only, unsigned Integer objects within a fixed, non-sparse range. | Class | opennlp.tools.ml.maxent | Natural Language Processing (OpenNLP) |
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| LineSearch | | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| LineSearch .LineSearchResult | | Class | opennlp.tools.ml.maxent.quasinewton.LineSearch | 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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| NegLogLikelihood | Evaluate negative log-likelihood and its gradient from DataIndexer. | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| ObjectDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| ObjectGISModelReader | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| ObjectGISModelWriter | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| ObjectQNModelReader | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| ObjectQNModelWriter | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| OldFormatGISModelReader | A reader for GIS models stored in the format used in v1. | Class | opennlp.tools.ml.maxent.io | 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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| ParallelNegLogLikelihood | | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| PerceptronModel | | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PerceptronModelReader | Abstract parent class for readers of Perceptron. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PerceptronModelWriter | Abstract parent class for Perceptron writers. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PerceptronTrainer | Trains models using the perceptron algorithm. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PlainTextFileDataReader | | Class | opennlp.tools.ml.model | Natural Language Processing (OpenNLP) |
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| PlainTextGISModelReader | A reader for GIS models stored in plain text format. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| PlainTextGISModelWriter | Model writer that saves models in plain text format. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| PlainTextPerceptronModelReader | | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PlainTextPerceptronModelWriter | Model writer that saves models in plain text format. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| PooledGISModelReader | This class works exactly like the SuffisSensitiveGISModelReader except that it attempts to pool all context strings. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
|
| 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) |
|
| QNMinimizer | and Elastic Net for solving convex optimization problems. | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| QNMinimizer .Evaluator | Evaluate quality of training parameters. | Interface | opennlp.tools.ml.maxent.quasinewton.QNMinimizer | Natural Language Processing (OpenNLP) |
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| QNMinimizer .L2RegFunction | | Class | opennlp.tools.ml.maxent.quasinewton.QNMinimizer | Natural Language Processing (OpenNLP) |
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| QNModel | | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| QNModelReader | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| QNModelWriter | | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
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| QNTrainer | Maxent model trainer using L-BFGS algorithm. | Class | opennlp.tools.ml.maxent.quasinewton | Natural Language Processing (OpenNLP) |
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| RealBasicEventStream | | Class | opennlp.tools.ml.maxent | 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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| SequenceTrainer | | Interface | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| SimplePerceptronSequenceTrainer | Trains models for sequences using the perceptron algorithm. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| SuffixSensitiveGISModelReader | A reader for GIS models which inspects the filename and invokes the appropriate GISModelReader depending on the filename's suffixes. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
|
| SuffixSensitiveGISModelWriter | A writer for GIS models which inspects the filename and invokes the appropriate GISModelWriter depending on the filename's suffixes. | Class | opennlp.tools.ml.maxent.io | Natural Language Processing (OpenNLP) |
|
| SuffixSensitivePerceptronModelWriter | A writer for GIS models which inspects the filename and invokes the appropriate GISModelWriter depending on the filename's suffixes. | Class | opennlp.tools.ml.perceptron | Natural Language Processing (OpenNLP) |
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| TrainerFactory | | Class | opennlp.tools.ml | Natural Language Processing (OpenNLP) |
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| TrainerFactory .TrainerType | | Class | opennlp.tools.ml.TrainerFactory | 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) |