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Progress indicator during pandas operations

... a new `tqdm` instance with `pandas` # (can use tqdm_gui, optional kwargs, etc.) tqdm.pandas() # Now you can use `progress_apply` instead of `apply` df.groupby(0).progress_apply(lambda x: x**2) In case you're interested in how this works (and how to modify it for your own callbacks), see the examp...
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Cosmic Rays: what is the probability they will affect a program?

... Makers go to huge lengths to make sure the silicon, solder, encapsulation etc doesn't contain any alpha or beta emitters. – Martin Beckett Apr 6 '10 at 3:12 16 ...
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HashSet vs. List performance

... @hypehuman the CPU cannot work directly on data in the system memory but pulls in data from the memory into its cache to work on. There is a significant delay between the request for memory to be moved and the memory actually arriving so th...
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Formula to determine brightness of RGB color

...the only CORRECT algorithm for converting sRGB images, as used in browsers etc., to grayscale. It is necessary to apply an inverse of the gamma function for the color space before calculating the inner product. Then you apply the gamma function to the reduced value. Failure to incorpor
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What is the performance cost of having a virtual method in a C++ class?

...predicted. This can cause a large pipeline bubble as the processor cannot fetch any instructions until the indirect jump (the call through the function pointer) has retired and a new instruction pointer computed. So, the cost of a virtual function call is much bigger than it might seem from looking ...
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What are the pros and cons of performing calculations in sql vs. in your application

...tatements to avoid unnecessary data access) don't push the database to its CPU limits with complex, concurrent calculations (in favour of pulling data into application memory and performing calculations there) In my experience, with a decent DBA and some decent knowledge about your decent database...
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Timer & TimerTask versus Thread + sleep in Java

...And it deals better with multithreading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution. share | impro...
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Which parallel sorting algorithm has the best average case performance?

...ld): Parallel sorting pattern Many-core GPU based parallel sorting Hybrid CPU/GPU parallel sort Randomized Parallel Sorting Algorithm with an Experimental Study Highly scalable parallel sorting Sorting N-Elements Using Natural Order: A New Adaptive Sorting Approach Update for 2013: Here is the ble...
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Implement C# Generic Timeout

...s no where near as bad as a process running out of control and using every CPU cycle & byte of memory that the PC has. But you are right to point out the potential problems to anyone else who may think this code is useful. – chilltemp Nov 19 '08 at 15:37 ...
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What happens to a declared, uninitialized variable in C? Does it have a value?

...avior instead of simply "undefined/arbitrary value", there are a number of CPU architectures that have additional flag bits in their representation for various types. A modern example would be the Itanium, which has a "Not a Thing" bit in its registers; of course, the C standard drafters were consid...