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The spelling of neighbors is inconsistent in the code sample. The code as printed in the first edition of the book, allows for negative index references in Python these will not cause index out of range errors, but will instead read from the opposite end of the list and does not explore the full domain. Test modified index again the upper bound. If this is almost 0, then why not accepting p becomes almost 1?

However, since p is quite small, there is not much annealing and we have to start from very high temperatures to have some p's close to 1. The mutate function is missing an else clause or some other mechanism for returning a default value. This results in None being appended to the pop list which causes badness in the cost function. Otherwise None will be added into pop occasionally. The output of dorm. After importing docclass, the db should be initialized.

The function for the calculation of the weighted probabilities weightedprob is wrong.

In more details, the variable "total" is calculated in a wrong way. In the book "total" is calculated as "the number of times this feature has appeared in all categories". However, the weighting factor "total" should be equal to the number of items in a considered category. The line states that a new instance variable should be added to classifier when in fact it should be added to naivebayes, as should the other methods on the page. That is, it should be: return self.

Fisher's method is described as: "The Fisher method involves multiplying all the probabilities together, then taking the natural log math. Add this method to fisherclassifier to do this calculation:" And indeed, this is how it is implemented. However, as far as I can tell, Fisher's method, according to other sources, is the summation of the natural logarithm of each observation, not the natural logarithm of the product sum of each observation. The SQL docclass. The functions incf and fcount generate program exceptions when the feature input contains a quotation mark and perhaps other characters as well.

For example, the SQLite statement: self. In the entryfeatures function, summarywords is produced by calling the lower method on each string produced by splitting the summary text. The function later tries to count uppercase words by calling the isupper method on each string in summarywords. Since these strings have already been converted to lower case, isupper will never return true.

I found a minor issue with the code example at page The code tries to detect overuse o uppercase use but it fails because it converts all the words to lowercase in the second list comprehension of the function. Just a mild typo but had me confused for a couple of minutes : What it says: If you want to use this new version with filterfeed, you'll have to change the function to pass the entries to the classifier rather than to fulltext. Just change the end to What it means: Change the ending of feedfilter. It's probably a typo, since in the implementation below, the computation didn't forget the minus sign.

The recursive calls at the end of the buildtree function should propagate the scoref parameter. Otherwise if you use a scoref function besides the default "entropy" function it will only be used on the first call.


Changing treepredict2. The reported results for the first test of the mdclassify function are different than those produced by the code in the downloadable code samples. Here's what I get with Python 2. Furthermore, some of the houses that it searches for appear to return no actual values from Zillow, or still cause the exception block to be hit.

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Later on, when the code asks for len row in the variance method of treepredict. Also, in getpricelist function, change l1. The gaussian function shown at the top of the page does not produce the results shown in the interactive interpreter sample code. The pdf says to call geneticoptimize using; optimization. These wine bottles would be so terrible that the cumulative probability would reach 1 at a price of 0, meaning there's nothing to see on the graph generated. A better example would be to use say a wine bottle rating of 99 that's 10 years old, with a call like: numpredict.

Like the error on page , using the vector 1,1 - a wine bottle with a rating of 1 and 1 year old, means that the wine would be so bad that it would all cost essentially 0. Instead, use a vector like say 99, Also, the value of 6 used for high is quite small. To get something that looks similar to figure , the value should be used instead. So, the line which reads: numpredict.

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The paragraph after the code sample states "The points will be O if the people are a match and X if they are not. If the plotagematches function is really to be called from one's Python session rather than being added to the advancedclassify. There is a sentence which states "There are two other points, X0 and X1, which are examples that have to be classified".

The diagram on the other hand uses points X1 and X2, but no X0.

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I believe that the sentence should be changed to "There are two other points, X1 and X2, which are examples that have to be classified. The URL for Yahoo! Maps Web Services has changed. Apparently there are two 3rd Avenues in New York city: one that's approximately 0. It might be good to include zip codes with some, or all, of the addresses from the matchmaker. Maps Services returns the latitude and longitude for the second address - the one that's circa 6. Just above the definition of the rbf function there should be an import math statement to ensure that the constant math.

See below. Without this change, each result returned by nlclassify will be the opposite of its intended value. Before you can execute any of the statements, you first need to reload advancedclassify using: reload advancedclassify The book also never defines the variable "offset" which is being parsed into the nlclassify function. I'm not sure what a reasonable value for this would be.

This should produce a value of some Two solutions: 1: Download version 2. The lines reading, m.

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The svmc. I used this website to get a version that works with Python 2. The code for facebook has change dramatically since the publishing and no longer functions. Non-Negative Matrix Factorization is well defined only when there all no all-zero rows and columns. The makeMatrix function, by excluding "words that are common but not too common," can eliminate all the word in some documents yielding all-zero rows.

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The evidence that this has occurred is error messages and NaNs in the output. It can be fixed two ways. A quick-and-dirty fix is to eliminate fewer words in makematrix ; this can be accomplished with simple changes to the if statement. A more robust fix is removing the resulting all-zero rows. As of D. Hi there, When I run the code of chapter 10 that comes with the book Programming Collective Intelligence I get the following error: news. Could you please help?

Kind regards, Thomas van Pelt the Netherlands. As some wrote, function selectindex can return value that is greater or equal to popsize. This results an error in caller function. The line if isinstance t1, node and isinstance t2, node : should read if hasattr t1, 'children' and hasattr t2, 'children' : The former does not allow the program to converge to the correct solution. Function selectindex can return value that is greater or equal to popsize. As currently presented, the when there is a tie between players i and j it is as if player i lost. In the gettextonly method in the FTS chapter: the subtext is bound to None sometimes raising exceptions and causing the indexing to fail.

Handle that via a None check for subtext: if subtext! In the FTS chapter there is a separatewords function [s. All trademarks and registered trademarks appearing on oreilly. Your Account. Errata for Programming Collective Intelligence. Confirmed Errata Unconfirmed Errata. All links pointed to kiwitobes site returning error.! The findings were drawn from analyses of selected Latin American nations and member countries of the Association of Southeast Asian Nations, as well as best practices and lessons learned from these and other governments.

We need good examples. We need to show it is possible to do, it is possible to do it smart, and it is possible to do it with citizens approving the policy and continuing that support. At COP24, Mehling has been discussing collaborative emissions reduction options for governments through a provision of the Paris Agreement, Article 6.

That allows one jurisdiction to meet its climate pledges with mitigation efforts achieved in another jurisdiction. That, in turn, should enable countries to increase the ambition of their climate efforts, but it also requires observing certain safeguards. Climate Resilience Initiative A2R to empower communities to become more resilient to climate-related risks and impacts. Kennedy moderated a discussion at the conference with winners of a recent contest organized through the collaboration, which asked communities to propose local solutions to their climate challenges.

How do they build the capacity to deal with these risks? On the panel, Kennedy talked with representatives of the two winning projects — one from Nepal, the other from India, and both led by women — in which each shared how they had used existing systems in their communities as the basis for new climate initiatives.

Providing a way for communities to make these contributions to climate action is essential, she says. The Climate CoLab is a really powerful platform that is able to reach into different communities and help the people who are actually experiencing the challenges put their proposals on the platform, then work collaboratively with people around the world on finding solutions.