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COUNT DISTINCT with CONDITIONS
I want to count the number of distinct items in a column subject to a certain condition, for example if the table is like this:
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Why does one hot encoding improve machine learning performance?
I have noticed that when One Hot encoding is used on a particular data set (a matrix) and used as training data for learning algorithms, it gives significantly better results with respect to prediction accuracy, compared to using the original matrix itself as training data. How does this performance...
How to find out which fonts are referenced and which are embedded in a PDF document
We have a little problem with fonts in PDF documents. In order to put the finger on the problem I'd like to inspect, which fonts are actually embedded in the pdf document and which are only referenced. Is there an easy (and cheap as in free) way to do that?
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figure of imshow() is too small
I'm trying to visualize a numpy array using imshow() since it's similar to imagesc() in Matlab.
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How can I replace a regex substring match in Javascript?
That replaces the entire string str with 1 . I want it to replace the matched substring instead of the whole string. Is this possible in Javascript?
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Get all attributes of an element using jQuery
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Array include any value from another array?
What's the most efficient way to test if an array contains any element from a second array?
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How to quit scala 2.11.0 REPL?
In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work.
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Capture key press (or keydown) event on DIV element
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