Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/702#discussion_r12501541
--- Diff: docs/mllib-optimization.md ---
@@ -128,10 +127,19 @@ is sampled, i.e. `$|S|=$ miniBatchFraction $\cdot n =
1$`, then the algorithm is
standard SGD. In that case, the step direction depends from the uniformly
random sampling of the
point.
-
+### L-BFGS
--- End diff --
This is the first time `L-BFGS` appears in the guide. So let us use
`Limited-memory BFGS (L-BFGS)`. Well, it is not necessary to explain `BFGS` ..
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