font slightly smaller.

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to pick a reasonable default value for gamma.

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if it fails to converge within the given max number of iterations.

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- changed the find_*_single_variable() functions so that their interfaces are like
  the other find_* functions.
- Made the verbose printout from feature ranking more reasonable.

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function for rank_features().

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pick reasonable default inputs to this function.

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of a single variable when derivatives are not available.

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  - Made the optimization routines return the value of the objective
    function at the end of optimization.

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get printed in a nice way.

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