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## cc.mallet.optimize
Class BackTrackLineSearch

    java.lang.Object
      cc.mallet.optimize.BackTrackLineSearch

All Implemented Interfaces:
  LineOptimizer.ByGradient

    public class BackTrackLineSearch

extends java.lang.Object
implements LineOptimizer.ByGradient

Constructor Summary
`BackTrackLineSearch(Optimizable.ByGradientValue optimizable)`

Method Summary
`double` | `optimize(double[] line, double initialStep)` Returns the last step size used.
`void` | `setAbsTolx(double tolx)` Sets the tolerance of absolute diff in function value.
`void` | `setRelTolx(double tolx)` Sets the tolerance of relative diff in function value.

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

Constructor Detail

### BackTrackLineSearch

    public BackTrackLineSearch(Optimizable.ByGradientValue optimizable)

Method Detail

### setRelTolx

    public void setRelTolx(double tolx)

  Sets the tolerance of relative diff in function value. Line search converges if `abs(delta x / x) < tolx` for all coordinates.

### setAbsTolx

    public void setAbsTolx(double tolx)

  Sets the tolerance of absolute diff in function value. Line search converges if `abs(delta x) < tolx` for all coordinates.

### optimize

    public double optimize(double[] line,
                           double initialStep)

  Description copied from interface: `LineOptimizer.ByGradient`
  Returns the last step size used.

  Specified by:
    `optimize` in interface `LineOptimizer.ByGradient`

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