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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 do I write the 'cd' command in a makefile?

... It is actually executing the command, changing the directory to some_directory, however, this is performed in a sub-process shell, and affects neither make nor the shell you're working from. If you're looking to perform more tasks within some_directory, you need to add a semi-colon and appen...
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Can you help me understand Moq Callback?

...your mock, but they happen concurrently. So you have no way of knowing the order in which they'd get called, but you want to know the calls you expected did take place (irrespective of order). You can do something like this: var cq = new ConcurrentQueue<bool>(); mock.Setup(f => f.Bar(It.Is...
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Memory management in Qt?

...d manually before the parent.) You could also delete the child first, the order doesn't matter. For an example where the order does matter here's the documentation about object trees. If your MyClass is not a child of QObject, you’ll have to use the plain C++ way of doing things. Also, note tha...
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Why does Twitter Bootstrap Use Pixels for Font Size?

...es need to increase the size of the text on a page fairly significantly in order to read it. However, when you use page zoom, you end up having to scroll left and right in order to read text and that gets old really fast. It's very easy to lose your place when you have to do that." ...
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Setting dynamic scope variables in AngularJs - scope.

...one please add a new answer to the question! Here is the example: var the_string = 'life.meaning'; // Get the model var model = $parse(the_string); // Assigns a value to it model.assign($scope, 42); // Apply it to the scope // $scope.$apply(); <- According to comments, this is no longer need...
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How do I globally configure RSpec to keep the '--color' and '--format specdoc' options turned on

... Whats the pros/cons to using .rspec or spec_helper.rb? @shamaoke @christoph – Ian Vaughan May 21 '13 at 10:31 2 ...
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ASP.NET MVC 3 Razor: Include JavaScript file in the head tag

...in the head tag along with all the other include files that are defined in _Layout.cshtml. 1 Answer ...
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When splitting an empty string in Python, why does split() return an empty list while split('\n') re

... The current API is not without advantages. Consider strings such as: ps_aux_header = "USER PID %CPU %MEM VSZ" patient_header = "name,age,height,weight" When asked to break these strings into fields, people tend to describe both using the same English word, "split". When as...
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Check synchronously if file/directory exists in Node.js

...t the top, followed by the various answers over the years in chronological order: Current Answer You can use fs.existsSync(): const fs = require("fs"); // Or `import fs from "fs";` with ESM if (fs.existsSync(path)) { // Do something } It was deprecated for several years, but no longer is. F...