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StochasticLinearRanker


android.bordeaux.learning

Class StochasticLinearRanker

  • Direct Known Subclasses:
    StochasticLinearRankerWithPrior


    public class StochasticLinearRanker
    extends Object
    Stochastic Linear Ranker, learns how to rank a sample. The learned rank score can be used to compare samples. This java class wraps the native StochasticLinearRanker class. To update the ranker, call updateClassifier with two samples, with the first one having higher rank than the second one. To get the rank score of the sample call scoreSample. TODO: adding more interfaces for changing the learning parameters
    • Field Detail

      • VAR_NUM

        public static int VAR_NUM
    • Constructor Detail

      • StochasticLinearRanker

        public StochasticLinearRanker()
        Initializing a ranker
    • Method Detail

      • resetRanker

        public void resetRanker()
        Reset the ranker
      • updateClassifier

        public boolean updateClassifier(String[] keys_positive,
                               float[] values_positive,
                               String[] keys_negative,
                               float[] values_negative)
        Train the ranker with a pair of samples. A sample, a pair of arrays of keys and values. The first sample should have higher rank than the second one.
      • scoreSample

        public float scoreSample(String[] keys,
                        float[] values)
        Get the rank score of the sample, a sample is a list of key, value pairs.
      • setModelWeights

        public boolean setModelWeights(String[] keys,
                              float[] values,
                              float normalizer)
      • setModelParameter

        public boolean setModelParameter(String key,
                                String value)
      • finalize

        protected void finalize()
                         throws Throwable
        Description copied from class: Object
        Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.

        Note that objects that override finalize are significantly more expensive than objects that don't. Finalizers may be run a long time after the object is no longer reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup. Note also that finalizers are run on a single VM-wide finalizer thread, so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary for a class that has a native peer and needs to call a native method to destroy that peer. Even then, it's better to provide an explicit close method (and implement Closeable), and insist that callers manually dispose of instances. This works well for something like files, but less well for something like a BigInteger where typical calling code would have to deal with lots of temporaries. Unfortunately, code that creates lots of temporaries is the worst kind of code from the point of view of the single finalizer thread.

        If you must use finalizers, consider at least providing your own ReferenceQueue and having your own thread process that queue.

        Unlike constructors, finalizers are not automatically chained. You are responsible for calling super.finalize() yourself.

        Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.

        Overrides:
        finalize in class Object
        Throws:
        Throwable


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