python-info

by politza Python Version: Current License: No License

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kandi X-RAY | python-info Summary

python-info is a Python library. python-info has no bugs, it has no vulnerabilities and it has low support. However python-info build file is not available. You can download it from GitHub.

python-info

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python-info has a low active ecosystem.

It has 14 star(s) with 5 fork(s). There are 4 watchers for this library.

It had no major release in the last 6 months.

python-info has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of python-info is current.

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python-info has no bugs reported.

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python-info has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

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python-info does not have a standard license declared.

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Without a license, all rights are reserved, and you cannot use the library in your applications.

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python-info releases are not available. You will need to build from source code and install.

python-info has no build file. You will be need to create the build yourself to build the component from source.

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Community Discussions

Trending Discussions on python-info

shape of input to calculate information gain

QUESTION

shape of input to calculate information gain

Asked 2018-Nov-28 at 16:59

I want to calculate the information gain on 20_newsgroup data set.

I am using the code here(also I put a copy of the code down of the question).

As you see the input to the algorithm is X,y My confusion is that, X is going to be a matrix with documents in rows and features as column. (according to 20_newsgroup it is 11314,1000 in case i only considered 1000 features).

but according to the concept of information gain, it should calculate information gain for each feature.

(So I was expecting to see the code in a way loop through each feature, so the input to the function be a matrix where rows are features and columns are class)

But X is not feature here but X stands for documents, and I can not see the part in the code that take care of this part! ( I mean considering each document, and then going through each feature of that document; like looping through rows but at the same time looping through columns as the features are stored in columns).

I have read this and this and many similar questions but they are not clear in terms of input matrix shape.

this is the code for reading 20_newsgroup:

...

ANSWER

Answered 2018-Nov-28 at 16:59

Well, after going through the code in detail, I learned more about X.T.nonzero().

Actually it is correct that information gain needs to loop through features. Also it is correct that the matrix scikit-learn give us here is based on doc-features.

But:

in code it uses X.T.nonzero() which technically transform all the nonzero values into array. and then in the next row loop through the length of that array range(0, len(X.T.nonzero()[0]).

Overall, this part X.T.nonzero()[0] is returning all the none zero features to us :)

Source https://stackoverflow.com/questions/53509247

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install python-info

You can download it from GitHub.
You can use python-info like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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