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1. 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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2. Commits on Oct 31, 2011

   • Shortened comment.

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   • Added code to make a replicated training set.

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3. Commits on Oct 29, 2011

   • Added scalar clip function.

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4. 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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5. Commits on Oct 25, 2011

   • Fixed some bugs in AdaBoost.

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6. Commits on Oct 24, 2011

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

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   • Filled in WeightedMajority.

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7. 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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8. Commits on Oct 17, 2011

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

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9. Commits on Oct 11, 2011

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

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10. Commits on Oct 9, 2011

    • Reformat to fit in 80 columns.

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11. Commits on Sep 15, 2011

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

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