normalization

How can I normalize a URL in python

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Have a look at this module: werkzeug.utils. (now in werkzeug.urls) The function you are looking for is called “url_fix” and works like this: >>> from werkzeug.urls import url_fix >>> url_fix(u’http://de.wikipedia.org/wiki/Elf (Begriffsklärung)’) ‘http://de.wikipedia.org/wiki/Elf%20%28Begriffskl%C3%A4rung%29′ It’s implemented in Werkzeug as follows: import urllib import urlparse def url_fix(s, charset=”utf-8″): “””Sometimes you get an URL by a user that just … Read more

When can I save JSON or XML data in an SQL Table

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The main questions are What are you going to do with this data? and How are you filtering/sorting/joining/manipulating this data? JSON (like XML) is great for data exchange, small storage and generically defined structures, but it cannot participate in typical actions you run within your RDBMS. In most cases it will be better to transfer … Read more

Why do we have to normalize the input for an artificial neural network? [closed]

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It’s explained well here. If the input variables are combined linearly, as in an MLP [multilayer perceptron], then it is rarely strictly necessary to standardize the inputs, at least in theory. The reason is that any rescaling of an input vector can be effectively undone by changing the corresponding weights and biases, leaving you with … Read more

Standardize data columns in R

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I have to assume you meant to say that you wanted a mean of 0 and a standard deviation of 1. If your data is in a dataframe and all the columns are numeric you can simply call the scale function on the data to do what you want. dat <- data.frame(x = rnorm(10, 30, … Read more

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