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Questions tagged [accelerate]

Make large-scale mathematical computations and image calculations, optimized for high performance.

74 questions
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Update cell values of a big pandas dataframe

I have a dataframe with 7K columns and and same 7K values as indices ex. c1 c2 .... c7000 c1 c2 . . . c7000 I want to update each cell of this dataframe on some condition. Can…
Shweta N
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Find median for an image array for background estimation fast in Swift/ObjectiveC

I need to estimate the background across multiple frames of a stationary video (not-moving camera). I have a number of frames and want to calculate the median for each pixel across all frames (usually 10 to 100 frames). I was able to do that with…
Mando
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Not able to enable XNNPACK (TFLite) properly on Objective-C for ARM64 (Xcode 12.5)

Learnt that XNNPACK can accelerate computation a lot in general, thus tried on Xcode/Objective-C. Here's the imp according to official doc // add XNNPACK TFLInterpreterOptions *options = [[TFLInterpreterOptions alloc] init]; options.useXNNPACK =…
Kitetaka
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qemu-img convert rbd volumes between different ceph clusters accelerate

Is there an elegant way to copy an RBD volume to another Ceph cluster? I calculate the convert time with qemu-img 2.5 version or qemu-img 6.0 version, by copying a volume(capability is 2.5T and 18G only used) to another Ceph cluster. qemu-img [2.5…
Victor Lee
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Swift - read two audio files and calculate their cross-correlation

(I'm using this as a reading file reference, this as an Objective-C clue that lacks implementation, this as the closest implementation I've seen so far in Objective-C.) I'm trying to get a cross-correlation array, calculated from two audio arrays in…
Miguel de Sousa
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Swift - create sine waves with high frequencies

I have the following problem: for the sake of amplitude modulation, I want to generate a sine wave with a given frequency. For lower frequencies (such as 440 Hz) the algorithm works well, but dealing with high frequencies (for example 20.000 Hz), I…
Ulrich Vormbrock
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Fast vectorized pixel-wise operations on images

I want to measure the similarity degree between two grayscale same sized images using mean square error. I can't use any framework which is not a part of macOS SDK(e.g. OpenCV, Eigen). Simple realization of this algorithm without vectorization looks…
borista
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Print a matrix stored as a SparseMatrixStructure

I am working with Apple's Accelerate framework, using Sparse Matrix operations. I have created a sparse matrix thus: var values: Array = [0.125, 0.08, -0.01, 0.405, -0.02, 0.005] var rowIndices: [Int32] = [0, 1, 2, // Column 0 …
Tomm P
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How to accelerate the operation including intersection and union of sets under the loops in python

judge = [[0,3,5], [1,2,4], [1,5,6], [],..., []] a = [[1,2], [2,3,4,5,7,9], [1,4,5], [],..., []] # len(judge) == len(a) res_intersect = [] for i in range(len(a)): for j in range(i+1,len(a)): if…
wyhhyw
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Matlab: Speed up "find() for each element in ND array"

I have an ND array and, for each element in the array, I need to find the index of the largest element in a vector that is below it. I'm doing this maaaany times so I really super extra interested in it being as fast as possible. I have written a…
Fredrik P
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How to optimise swift code for drawing large datasets in realtime in graphs that can scroll and zoom

I am writing my own code in swift to draw a graph to display a large data set. (The reason not to use existing frameworks is I would like to use logarithmic and linear views, as well as user interaction with the graph). I need help trying to speed…
samp17
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swift Accelerate: the vDSP enum

I've been going through the new Accelerate framework for swift as I am looking to optimise all of my vector calculations. I found the following enum called vDSp which avoids me re-writing the entire set of vector maths: …
triple7
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error: use of undeclared type 'Accelerate'

Converting YUV420 to RGB using Accelerate Framework in swift. call to vImageConvert_420Yp8_Cb8_Cr8ToARGB8888is throwing Thread 1: EXC_BAD_ACCESS (code=1, address=0x108bc9000) While debugging source and destination pointer then showing this…
Afsar edrisy
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How to move bitmap of background at a varying speed?

I encountered an unexplainable problem. This might contitute a flaw in the android studio. Mainly: I am developing a game, where the background (grass or trees) moves in the opposite direction to the player, pretty simple. Both of them (grass and…
Kolorowy Paw
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Programatically create storage arrays for DSPSplitComplex complex numbers

I am using Apple's Accelerate framework with swift. I am working with DSPSplitComplex numbers to work with complex vectors. I would like to create a filter bank (An array of filters). To do this, I iterate through a loop, and add the result to my…
samp17
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