stsievert / swix Goto Github PK

With Swift still changing, factor methods are being replaced by constructors.
Not sure what timeline is best for this, but at some point code such as:

var x = String.stringWithContentsOfFile(prefix+"../"+filename, encoding: NSUTF8StringEncoding, error: nil)

needs to be changed to:

var x = String(contentsOfFile: prefix+"../"+filename, encoding: NSUTF8StringEncoding, error: nil)

to continue building (thats necessary as of Xcode 6.1 beta 2)

Hi!

I am trying to install swix in this project https://github.com/hollance/Forge/tree/master/Examples/YOLO. After following the swix manual install instructions of adding the swix folder to the project and adding swix-master/swix/swix/swix to the objective c bridging header and running, I get this error Ambiguous use of operator '/', pointing to these line of code as canidates.
func / (lhs: Int, rhs: Int) -> Double{
return lhs.double / rhs.double}
func / (lhs: Double, rhs: Int) -> Double{
return lhs / rhs.double}

I also get an error Use of unresolved identifier 'Process', pointing to this line of code

Process.launchedProcess(launchPath: "cd", arguments: [S2_PREFIX+";", PYTHON_PATH, "imshow.py", filename, "(save)", "(show)"])
print("savefig: Removing CSV FILE " + S2_PREFIX + "temp.csv")
Process.launchedProcess(launchPath: "rm", arguments: [S2_PREFIX+"temp.csv"])

This is on xcode version 8.3.3. What is the cause of these issues? Any advice on fixing?

Thank you so much!
Jordan

Opinions on including some plotting functionality?
It would probably not be a random window popping up like in MATLAB, but maybe it could output to a PNG, or a UIView / NSView, which could then be embedded directly in the given app's view hierarchy?

Could you update the code for this library for the latest version of Swift?

Thanks!

i.e., https://github.com/apple/swift-package-manager and https://swift.org/package-manager/

Due to this all the ndarray and some of the matrix operations don't have the expected behavior similar to NumPy's.

After they released the final release of Swift, this is no longer allowed. There are lots of them in swix, so it no longer builds.
See https://devforums.apple.com/message/1011396#1011396

Running this little Python snippet on my machine takes 3.5 seconds:

import numpy as np
import time

t = time.time()
for i in range(1000):
    a = np.arange(100000)
    a += 1
    a = a * a
    a = a / a
    b = np.ones(100000)
    if not np.allclose(a, b): print "?"
print time.time() - t

The corresponding Swix-variant takes 33.7 seconds (factor 10 slower than NumPy).

var a = array(1, 2, 3, 4)
var b = array(1, 2, 3, 4)
var c = intersection(a, b)
print(c) // array([])

This is obviously wrong and was pointed out by @srambhatla while working on a different project that incorporates swix.

the find function pretty much returns the original matrix. Modify it to take a logical statement like find (X > 0) and return

1. argwhere (X > 0 )
2. X [ argwhere( X > 0 ) ]
   this will also make it more MATLAB like.

eye(1) creates an empty matrix:

print(eye(1))

output:
matrix([])

Hi
I'm trying to install swix in my IOS app. To do that I follow the different instructions of the swix 0.30 documentation in the "How to creat a new iOS app that includes swix" paragraph.

For me all the different steps are ok until the Swift bridging header modification. As you can see in the attach image, i don't have the objective-c bridging header menu in my project setting.

Have you an idea of my problem?? (for information i used Xcode 8.2.1)

Best regards

In the swift speed benchmark, introduced in commit e0cd9df

This means that files like oneD-operators.swift has compile errors because variables are called 'operator'

Please give a detailed and working steps for installing swix on a new project.
I tried several times to follow the given steps.
First I found that OpenCV must be added as Framework in order to compile the project.
In this way the project compiles but the functions cannot be called in any swift file, how to make swix to work?

Many thanks

Here it is.

These tests should be good enough. I think.

Edit

Ah, I see. You're working now on the package-manager branch. Take your time... :)
Maybe I'll drop a PR to help you implementing/porting/testing stuff ^^

Motivated by this email:

Thanks for Swix. The program is stuck because it cannot find the file below:
/Users/askoh/askoh/apple/swift/swix-master 2/python_testing/csvs/image.csv

What must I change in the program to make it run to completion.
Inside func write_csv
prefix String "/Users/askoh/Developer/swix/swix/swix/swix/"
filename String "../../python_testing/csvs/image.csv"

str.writeToFile(prefix+"../"+filename, atomically: false, encoding: NSUTF8StringEncoding, error: &error)

Thanks,
Aik-Siong Koh

In the function runTests, read/write CSV references ../../python_testing/csvs/. This means that tests do not run unless that folder is included (i.e., unless the repo is cloned). The tests should run independently of the file structure.

Ideas

• Delete the file after testing. This might cause issues with iOS and OS X -- I don't think there's a system call on iOS. I'm not inclined to go with this option -- it excludes the Python testing.
• Include another folder called testing in the local swix folder. I'm inclined to go with this option. The Python testing is reading files related to swix; those files should belong to swix.

I followed the directions in your installation instructions and the library seems to be working well with the included OpenCV 2.4.9. I would like to make it work with OpenCV 3.X.X but when I try to replace the included OpenCV with OpenCV 3 I would get multiple errors:

error core.hpp header must be compiled as C++
error base.hpp header must be compiled as C++

It seems like they added #ifndef __cplusplus in core.hpp that forces C++ in OpenCV 3

Anyway I can get OpenCV 3 to work with this library?

the fft and ifft implementations in complex-math.swift are wrong:

• the number of elements inside the input (real) array must be a power of 2 for the FFT to give correct results
• as stated at https://developer.apple.com/library/ios/documentation/Performance/Conceptual/vDSP_Programming_Guide/UsingFourierTransforms/UsingFourierTransforms.html the output of Accelerate fft functions must be re-scaled: you're already dividing by 2 the output of forward real transforms, while you should divide by n (not 2048) the output of inverse real transforms.

Random numbers currently have a fixed seed. Would be nice to have a command to control it. For e.g. MATLAB has rng for this.

calling numpy.save on a numpy array saves it to disk in a binary format. If these could be loaded into Swift directly, that would be pretty amazing. Existing codes could crunch out interpolant data on a desktop machine, for later use within a mobile application.

Hi Team,

does this library support the image classification or we can say object detection in image? for example, identifying cat, dog, etc in a image.

I will be working on my research topic where I need this support?

Regards,
Sandeep

Many errors like:

Argument labels '(_:)' do not match any available overloads

Just downloaded the latest version siwx-master and opened "swixMacOSX.xcodeproj it with Xcode6 beta 5 and received 199 errors. All were in 2 files "oneD-operators.swift" and "twoD-operators.swift"
I would like to use this file for 1D and 2D signal processing. I would especially like a Complex 2D FFT. I have been able to produce a working 1d version using the Accelerate framework (without the aid of swix) that works without any c- files, but a 2D version eludes, at present.
I have a Imac OSX 10.9.4

How do you use swiftAccelerate?

In ndarray/complex-math.swift, fft(x: ndarray) and ifft(yr: ndarray, yi: ndarray) each call vDSP_create_fftsetupD to set up the following call of vDSP_fft_zropD. The system then allocates memory that is never released.

Simply appending a call to vDSP_destroy_fftsetupD at the end of each function would technically fix the leak, but these functions are not meant to be called in a performance-sensitive context anyway. In my own project, I have split the method into two, the first of which is only called once per value of N:

func fftInit(N: Int) -> FFTSetupD {
    var radix: FFTRadix = FFTRadix(FFT_RADIX2)
    var pass: vDSP_Length = vDSP_Length((log2(N.double)+1.0).int)
    var setup: FFTSetupD = vDSP_create_fftsetupD(pass, radix)
    return setup
}

func fft(x: ndarray, withSetup setup: FFTSetupD) -> (ndarray, ndarray) {
    //... (where the contents of fftInit above have been removed)
    vDSP_fft_zropD(setup, &x2, stride, &y, stride, log2n.length, dir)
    //...
}

The non-memory-leaking alternative closest to the original would be:

func fft(x: ndarray) -> (ndarray, ndarray) {
    //...
    var setup:FFTSetupD = vDSP_create_fftsetupD(pass, radix)
    //...
    vDSP_fft_zropD(setup, &x2, stride, &y, stride, log2n.length, dir)
    vDSP_destroy_fftsetupD(setup)
    //...
}

The reason I have not submitted a pull request is that clearly there is a decision to be made here: performance vs flexibility. My project requires performance, so I create the FFTSetupD structure once and reuse it over and over. Swix, as I understand it, is meant to emulate the NumPy model, where the flexibility of being able to use one single function call to compute the FFT is preferred over potential speed gains.

In summary, I would like to draw the maintainer's attention to the memory leak caused by repeated calls of fft or ifft, and introduced by vDSP_create_fftsetupD. I would also like to start a discussion on the limits of emulating the elegance of NumPy in Swift, and making number crunching in Swift fast and flexible at the same time.

This is a very cool project. I'm wondering if there is any interest in adding a shape attribute of ndarrays? I see there is some interest (for good reason) in being similar to numpy/matlab, and the program I'm writing makes its own shape variables for ndarrays. I'd make a pull request if project maintainers believe it would be a desirable and straightforward change.

Everything works fine on the Simulation, as soon as I plug any device I cannot install the App.
The following error appars.

ld: '/mypath/myproject/swix/objc/opencv2.framework/opencv2(knearest.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It seems a clang problem any idea how to solve it?