[SPARK-2163] class LBFGS optimize with Double tolerance instead of Int#1104

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BaiGang:fix_int_tol

Commits on Jun 18, 2014

Changed setConvergenceTol'' to specify tolerance with a parameter of type Double. For the reason and the problem caused by an Int parameter, please check https://issues.apache.org/jira/browse/SPARK…
BaiGang
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