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Commits on Nov 14, 2011

• Move CountingProbDist to learning.py and use it in NaiveBayesLearner. Make NaiveBayesLearner use target-value frequencies too.

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Commits on Oct 31, 2011

• Shortened comment.

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• Added code to make a replicated training set.

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Commits on Oct 29, 2011

• Added scalar clip function.

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Commits on Oct 28, 2011

• Don't compare strings with 'is not'. (Broke things in pypy.) Also show Struct members in sorted order so doctests work in pypy.

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Commits on Oct 25, 2011

• Fixed some bugs in AdaBoost.

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Commits on Oct 24, 2011

• Probably-saner divide-by-0 handling in AdaBoost.

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• Filled in WeightedMajority.

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Commits on Oct 23, 2011

• Tweaked information_content().

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• Tweaked information_gain().

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• Fixed typo in untested code.

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• Changed NotImplemented to something that actually complains. Lack of this bit me.

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• Fixed normalize() to work on []. Added AdaBoost.

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• Oops, s/No/False/ as there is no No.

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• Tweak: use generator comprehension.

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• Use heapq.nsmallest in NearestNeighborLearner.

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• Replaced Learner with a functional interface. This is a pretty big change you might especially want to review.

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• Extract decision_tree_predict().

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• Move distance function into DataSet where users can change it.

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• Break information-gain ties randomly too.

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• Fixed DataSet doc comments. Added rep-invariant check. DecisionTreeLearner now breaks ties on leaves randomly. NaiveBayesLearner now collects stats only on input fields. Minor cleanup.

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• More readable doctest result using .display(). Restored old repr() code.

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• Fixed: bools aren't ints in modern Python. (Didn't really matter.)

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• Reordered methods top-down.

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• Removed unused "return self"

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• EnsembleLearner: Removed unused and somewhat dangerous default learners=[].

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• NaiveBayesLearner: Fixed doc comment and added an assertion.

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• Lined up DataSet params with the documented fields. Documented extra param. Fixed .sanitize() to replace with None (the old code no longer did quite what was documented).

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• Stripped trailing whitespace.

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• Added Fig. 18.6 as a test.

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• Converted learning.py to 3rd edition.

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Commits on Oct 17, 2011

• Provisionally dropping support for Python 2.4. Changed some loops to use any() and all().

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Commits on Oct 11, 2011

• Started converting to 3rd edition. agents.py converted plus a little extra cleanup.

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Commits on Oct 9, 2011

• Reformat to fit in 80 columns.

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Commits on Sep 15, 2011

• Moved assignment of self.dataset into train().

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