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Performance of Java matrix math libraries? [closed]

We are computing something whose runtime is bound by matrix operations. (Some details below if interested.) This experience prompted the following question: ...
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Which commit has this blob?

Given the hash of a blob, is there a way to get a list of commits that have this blob in their tree? 7 Answers ...
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How do I find the length of an array?

Is there a way to find how many values an array has? Detecting whether or not I've reached the end of an array would also work. ...
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Coarse-grained vs fine-grained

What is the difference between coarse-grained and fine-grained? 11 Answers 11 ...
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Android search with Fragments

Does somebody know of a tutorial or an example of how to implement the standard Android search interface with Fragment s? In other words, is it possible to put a standard search with a SearchManager in a Fragment? ...
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How to determine if a record is just created or updated in after_save

The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update? ...
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What's is the difference between train, validation and test set, in neural networks?

I'm using this library to implement a learning agent. 7 Answers 7 ...
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Use 'class' or 'typename' for template parameters? [duplicate]

When defining a function template or class template in C++, one can write this: 10 Answers ...
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How can I capitalize the first letter of each word in a string?

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Defining a variable with or without export

What is export for? 14 Answers 14 ...