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what is the difference between 'transform' and 'fit_transform' in sklearn

In the sklearn-python toolbox, there are two functions transform and fit_transform about sklearn.decomposition.RandomizedPCA . The description of two functions are as follows ...
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How to count certain elements in array?

... to use the right tool for the job" -requests never made much sense to me. And we can argue what is most elegant. E.g. for me, making a function call per element to just to compare it to a value is not elegant. – Felix Kling May 25 '11 at 8:33 ...
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Is it possible to update a localized storyboard's strings?

I localized a part of my application with creating a base.lproj storyboard and 3 string files for it. It was a month ago and after that I added new view controller to app, but this controller's buttons and labels not appear in string files ...
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Compare two List objects for equality, ignoring order [duplicate]

... If you want them to be really equal (i.e. the same items and the same number of each item), I think that the simplest solution is to sort before comparing: Enumerable.SequenceEqual(list1.OrderBy(t => t), list2.OrderBy(t => t)) Edit: Here is a solution that performs a bit ...
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What is memoization and how can I use it in Python?

I just started Python and I've got no idea what memoization is and how to use it. Also, may I have a simplified example? ...
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How can I deploy/push only a subdirectory of my git repo to Heroku?

I have a project that uses Serve and is version controlled using Git. Serve creates an output folder with static files that I want to deploy to Heroku. ...
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jQuery UI Sortable, then write order into a database

...nt to use the jQuery UI sortable function to allow users to set an order and then on change, write it to the database and update it. Can someone write an example on how this would be done? ...
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Setting git parent pointer to a different parent

... Using git rebase. It's the generic "take commit(s) and plop it/them on a different parent (base)" command in Git. Some things to know, however: Since commit SHAs involve their parents, when you change the parent of a given commit, its SHA will change - as will the SHAs of ...
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Check if two linked lists merge. If so, where?

...wed" it was meant "you may change but in the end they should be restored", and we could iterate the lists exactly twice the following algorithm would be the solution. First, the numbers. Assume the first list is of length a+c and the second one is of length b+c, where c is the length of their co...
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Combining node.js and Python

... For communication between node.js and Python server, I would use Unix sockets if both processes run on the same server and TCP/IP sockets otherwise. For marshaling protocol I would take JSON or protocol buffer. If threaded Python shows up to be a bottleneck, ...