No momentum for LBSGD

I see that LBSGD is not listed as an optimizer with momentum in incubator-mxnet/example/image-classification/common/, but it indeed has the functions to create states for it. I was wondering if it was disabled because of some reason.

See this issue, which was closed in favor of this discussion topic:

Probably the doc hasn’t been updated. Cannot think of a reason not being able to use momentum.

Agreed, just looks like it wan’t updated when these optimizers were added. Will ask for the Github issue to be reopened, and tagged correctly. Good spot @al-rigazzi!

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