Adding a pruning method to the tree#941

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sgenoud wants to merge 14 commits intoscikit-learn:masterfrom

Commits on Jul 10, 2012

Introduced pruning to decision trees
Steve Genoud
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4a75a4a
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Merge branch 'master' of git://github.com/scikit-learn/scikit-learn
Steve Genoud
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48fad0c
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Fixed documentation of pruning_order function
Steve Genoud
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c51698a
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Added a max_to_prune argument to pruning_order
Steve Genoud
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c139f6a
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Commits on Jul 11, 2012

Incorporated feedback
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Steve Genoud
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35a8b3d
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Merge branch 'master' of git://github.com/scikit-learn/scikit-learn
Steve Genoud
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4310876
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Made n_output an optional value
Steve Genoud
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0409c05
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Cleaned the function documentation (again)
Steve Genoud
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89af373
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Use shuffle and split to cross validate
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First draft of the documentation
Steve Genoud
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9e41d88
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Commits on Jul 12, 2012

pep8 corrections
Steve Genoud
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92c6afb
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Commits on Jul 24, 2012

Renamed cv_scores_vs_n_leaves as pruned_path
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sgenoud
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acd4048
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Added n_leaves to the DecisionTree estimator
sgenoud
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98255d8
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Moved the helper functions inside the Tree object
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ea8e460
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