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## org.biojava.bio.dist
Class SimpleDistributionTrainerContext

    java.lang.Object
      org.biojava.bio.dist.SimpleDistributionTrainerContext

All Implemented Interfaces:
  Serializable, DistributionTrainerContext

Direct Known Subclasses:
  SimpleModelTrainer

    public class SimpleDistributionTrainerContext

extends Object
implements DistributionTrainerContext, Serializable

A no-frills implementation of DistributionTrainerContext.

Since:
  1.0
Author:
  Matthew Pocock
See Also:
  Serialized Form

Constructor Summary
`SimpleDistributionTrainerContext()` Create a new context with no initial distributions or trainers.

Method Summary
`void` | `addCount(Distribution dist, Symbol sym, double times)` Registers that sym was counted in this state.
`void` | `clearCounts()` Clears all of the counts to zero.
`double` | `getCount(Distribution dist, Symbol sym)` Return the number of counts of a particular symbol which will be used to train the specified distribution.
`double` | `getNullModelWeight()` Return the number of pseudocounts added to the distribution when training.
`DistributionTrainer` | `getTrainer(Distribution dist)` Return the Distribution trainer object from the current context.
`void` | `registerDistribution(Distribution dist)` Register a distribution object with this context.
`void` | `registerTrainer(Distribution dist, DistributionTrainer trainer)` Register a Distribution and an associated DistributionTrainer object.
`void` | `setNullModelWeight(double nullModelWeight)` Set the number of pseudocounts to add when training the distribution.
`void` | `train()` Trains the Distribution, given a null model.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SimpleDistributionTrainerContext

    public SimpleDistributionTrainerContext()

  Create a new context with no initial distributions or trainers.

Method Detail

### getNullModelWeight

    public double getNullModelWeight()

  Description copied from interface: `DistributionTrainerContext`
  Return the number of pseudocounts added to the distribution when training.

  Specified by:
    `getNullModelWeight` in interface `DistributionTrainerContext`
  Returns:
    the null model weight

### setNullModelWeight

    public void setNullModelWeight(double nullModelWeight)

  Description copied from interface: `DistributionTrainerContext`
  Set the number of pseudocounts to add when training the distribution. These counts are added in proportion to the null model of the distribution being trained.

  Specified by:
    `setNullModelWeight` in interface `DistributionTrainerContext`
  Parameters:
    `nullModelWeight` - the new null model weight

### registerDistribution

    public void registerDistribution(Distribution dist)

  Description copied from interface: `DistributionTrainerContext`

  Register a distribution object with this context.

  This method is a request to the context to register dist. If dist is already registered then this method should do nothing. If it is not registered, then it should invoke dist.registerWithTrainer

  Specified by:
    `registerDistribution` in interface `DistributionTrainerContext`
  Parameters:
    `dist` - the Distribution to register

### registerTrainer

    public void registerTrainer(Distribution dist,
                                DistributionTrainer trainer)

  Description copied from interface: `DistributionTrainerContext`

  Register a Distribution and an associated DistributionTrainer object.

  In the registerWithTrainer method of a Distribution, it should associate itself with a trainer using this method.

  Specified by:
    `registerTrainer` in interface `DistributionTrainerContext`
  Parameters:
    `dist` - the distribution to be registered.
    `trainer` - the distribution's trainer object to be registered.

### getTrainer

    public DistributionTrainer getTrainer(Distribution dist)

  Description copied from interface: `DistributionTrainerContext`
  Return the Distribution trainer object from the current context.

  Specified by:
    `getTrainer` in interface `DistributionTrainerContext`
  Parameters:
    `dist` - the Distribution whose trainer is required
  Returns:
    the DistributionTrainer for the distribution

### addCount

    public void addCount(Distribution dist,
                         Symbol sym,
                         double times)
                  throws IllegalSymbolException

  Description copied from interface: `DistributionTrainerContext`

  Registers that sym was counted in this state.

  This method may be called multiple times with the same symbol. In this case, the times should be summed.

  Specified by:
    `addCount` in interface `DistributionTrainerContext`
  Parameters:
    `dist` - the Distribution that the symbol was associated with
    `sym` - the Symbol seen
    `times` - the number of times to add
  Throws:
    `IllegalSymbolException` - if sym is not recognised by dist

### getCount

    public double getCount(Distribution dist,
                           Symbol sym)
                    throws IllegalSymbolException

  Description copied from interface: `DistributionTrainerContext`
  Return the number of counts of a particular symbol which will be used to train the specified distribution.

  Specified by:
    `getCount` in interface `DistributionTrainerContext`
  Parameters:
    `dist` - the Distribution to return counts for
    `sym` - the symbol to get the count for
  Returns:
    the number of counts
  Throws:
    `IllegalSymbolException` - if the symbol is not accepted by the distribution

### train

    public void train()
               throws ChangeVetoException

  Description copied from interface: `DistributionTrainerContext`

  Trains the Distribution, given a null model.

  This will use the information collected with multiple addCount calls, and the null model to generate the new weights.

  Specified by:
    `train` in interface `DistributionTrainerContext`
  Throws:
    `ChangeVetoException` - if any of the distributions can't be trained

### clearCounts

    public void clearCounts()

  Description copied from interface: `DistributionTrainerContext`
  Clears all of the counts to zero.

  Specified by:
    `clearCounts` in interface `DistributionTrainerContext`

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