MRG: Major SGD extension module refactoring#612

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pprett merged 11 commits intoscikit-learn:masterfrom

pprett:sgd-refactoring

Feb 13, 2012

Commits on Feb 7, 2012

factored out weight vector class; dense SGD now uses ``WeightVector`` instead of explicit ndarray and wscale.
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enh: performance of WeightVector now comparable to explicit weight vector. some cosmits in dense sgd extension module.
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wip: sparse sgd now uses WeightVector - there are some broken tests tough.
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wip: still hunter sparse sgd bug
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fix: forgot to scale by wscale at the end of dot_sparse. All tests are green again!
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added new sgd dataset abstraction to unify sparse and dense implementations.
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Merge branch 'master' into sgd-refactoring
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major refactoring of sgd module::
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Commits on Feb 8, 2012

use Py_ssize_t where appropriate; cosmit
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Commits on Feb 12, 2012