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Questions tagged [arrayfire]

ArrayFire is a software library that simplifies GPU computing.

From the github page:

ArrayFire is a high performance software library for parallel computing with an easy-to-use API. Its array based function set makes parallel programming simple.

ArrayFire's multiple backends (CUDA, OpenCL and native CPU) make it platform independent and highly portable.

A few lines of code in ArrayFire can replace dozens of lines of parallel computing code, saving you valuable time and lowering development costs.

Useful Links:

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Change ArrayFire array at Index Array with repeating indexes

Is there a Way to Change an Array multiple times at the same Position? When I do this: float a[] = { 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 }; array A(6, a, afHost); af_print(A); float i[] = { 0, 1, 2, 2}; array I(4, i, afHost); A(I) +=…
Imma
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Importing ArrayFire Causes Hang When Complete

I'm not sure if this is an Anaconda, Arrayfire, or Windows issue, but importing Arrayfire into a script seems to be causing the script to hang when complete. I'm using Anaconda as my python environment on Windows 7 Python 2.7.14 |Anaconda,…
nanoPhD
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row/column-wise outer product in arrayfire-python

How to implement row/column-wise outer product in arrayfire-python? Here is analogical implementation in numpy. A = np.random.randint(1,7, size=(3,2)) B = np.random.randint(1,7, size=(2,3)) X = np.einsum('ik,kj->kij', A,B) X array([[[ 8, 16, 12], …
Евгений Артеменко
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Forcing ArrayFire to switch backends in Python

I have been attempting to force ArrayFire to use its CPU backend, rather than the default CUDA backend. According to this documentation page, you only need to call arrayfire.set_backend('cpu'). However, when I attempt to do this, an error is thrown…
TimD1
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ArrayFire seq to int c++

Imagine a gfor with a seq j... If I need to use the value of the instance j as a index, who can I do that? something like: vector a(n); gfor(seq j, n){ //Do some calculation and save this on someValue a[j] = someValue; } Someone can…
Lucas Amparo Barbosa
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Vectorized LUT classification using ArrayFire

Is there a way to write a vectorized table lookup using ArrayFire? I'm trying to implement a binary 2D pixel classifier using a 255x255 lookup table. This table contains the 2 channels value combinations [0,255] which should be classified:…
Sam De Roeck
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Arrayfire Supported Image Formats

I want to start a little project to identify duplicate images on my hard disk - mainly to try out GPU and Swift. I was looking at Arrayfire and was wondering if it actually is capable of loading RAW images. I read the docu and saw it uses FreeImage…
mercator
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Arrayfire - rendering a heatmap as an image/array with the available colormaps

I'm using Arrayfire to make a 2D heat transfer simulation. My dataset is a matrix of temperatures and I want to vizualize it as a heatmap. I need to produce frames of the colored dataset and save it as an image on the disk. So each temperature in my…
Vincent Martel
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arrayfire SVD jobu and jobvt parameters

The svd and svdInPlace functions provided by Arrayfire are hard-wired to use 'A' as the parameter for jobu and jobvt. Is there a way to use 'S' for this parameter instead? I need to compute the SVD of an extremely tall but narrow matrix, and I only…
user2297560
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Faster exponentiation of complex arrays in Python using Arrayfire

According to the arrayfire pow documentation, af.pow() currently only supports powers (and roots...) of real arrays. No error is thrown, but I found that using af.pow() with complex input can cause a huge memory leak, especially if other functions…
user6565699
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Array Conditional Filtering (ArrayFire)

I have two arrays A (2D image) and B (1d intensity values) and trying to make third one (2D) with will be size of A but contain only values of A that B has. What will be the the right way to do that without moving data to the host? PS: Trying to…
Grammer
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Is it possible to run piece of pure C++ code in GPU

I don't know OpenCL very much but I know C/C++ API requires programmer to provide OpenCL code as a string. But lately I discovered ArrayFire library that doesn't require string-code to invoke some calculations. I wondered how is it working (it is…
Mariusz Jaskółka
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Does array fire constructor automatically deduce type when constructing from host pointer?

I read from the documentation of array fire that one can construct an array fire array from host pointer. Something like double * host_data; //do stuff with host_data af::array array(nrows, ncols, host_data); //suppose is a nrows by ncols…
Ran Wang
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Multiplying a vector component with an array in ArrayFire

I'm getting an error while trying to multiply a vector component with an array (element-wise multiplication or broadcast). The docs show that this overloaded case for * should be fine: AFAPI array operator* (const float &lhs, const array &rhs) …
Bruce Dean
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Syntax of ArrayFire for C++ (multiplying array by scalar)

I have gone through the documentation and looked at examples, but I am having trouble understanding the syntax of "operator(star)". For example, if I have an array called "array1", and I want to multiply it by a value, 3, how would I incorporate…
AaronJPung
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