[Deep learning] Gradient Descent Optimizer

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https://icim.nims.re.kr/post/easyMath/70 알기 쉬운 산업수학 알기 쉬운 산업수학 Gradient Descent Optimizer 2017년 12월 13일(수) | 김민중 URL  (1) 주어진 목적함수  f f 의 최솟값(minimum)을 찾아가는 알고리즘으로 다음과 같은 방식으로 최솟값을 찾아간다. 초기값  x 0 x 0 을 임의로 설정, 적당한 Learning rate  α α  설정 n ≥ 0 n ≥ 0 인 정수에 대해서  x n + 1 x n + 1 은 다음과 같이 정의한다. x n + 1 : = x n − α ⋅ ∇ f ( x n ) x n + 1 := x n − α ⋅ ∇ f ( x n ) 주의사항 함수 f f 의 모양이 convex가 아닌 경우 global minimum이 아닌 local minimum으로  x n x n 이 수렴할 가능성이 있다. Learning rate  α α  값이 큰 경우 최솟값으로  x n x n 이 수렴하는 것이 아니라 발산할 수 있다. Learning rate  α α  값이 작은 경우 수렴하는 속도가 지나치게 느릴 수 있다. 방정식  2 ⋅ x = 10 2 ⋅ x = 10  의 근을 Gradient Descent를 이용해서 찾아보자. 목적함수  f ( x ) : = ( 10 − 2 x ) 2 f ( x ) := ( 10 − 2 x ) 2 으로 설정하겠다( f f 의 최솟값인 0이 되게 하는  x x 값이 우리가 원하는 방정식의 근이다). 초기값  x 0 = 0 x 0 = 0 , Learning rate  α = 0.05 α = 0.05 으로 설정 f ′ ( x ) = 4 ( 2 x − 10 ) f ′ ( x ) = 4 ( 2 x − 10 ) 이므로  x 1 x 1 은 다음과 같이 구할 수 있다. x 1 = x 0 − α ⋅ f ′ ( x 0 ) = 0 − 0.05 ⋅ ( − 40 ) = 2 x
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Add "Firebase" to a project.

<With cocoapods>
1. In your xcode project folder, open a terminal and type in "pod init" and enter.
2. It will create a "Podfile" file.
3. Add "pod 'Firebase/Core'
4. In terminal, type in "pod install" and enter.
5. It will create a $(projectname). xcworkspace.
6. Open the project file.
7. Download "GoogleService-Info.plist" from here and add to your project.
8. Inherited calss from UIApplicationDelegate  add @import Firebase;
9. In application:didFinishLaunchingWithOptions: method add [FIRApp configure];


<For old project>

1. If you met a error message after type in "pod install" in terminal window.



Then you should change "Development Target" in general tab. ( at least v8.0 )








2. After 'pod install' some warning message appear then follow the guide.


[!] Please close any current Xcode sessions and use `SFMessanger.xcworkspace` for this project from now on.
Sending stats
Pod installation complete! There is 1 dependency from the Podfile and 5 total pods installed.

[!] The `SFMessanger [Debug]` target overrides the `HEADER_SEARCH_PATHS` build setting defined in `Pods/Target Support Files/Pods-SFMessanger/Pods-SFMessanger.debug.xcconfig'. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or
- Remove the build settings from the target.

[!] The `SFMessanger [Debug]` target overrides the `OTHER_LDFLAGS` build setting defined in `Pods/Target Support Files/Pods-SFMessanger/Pods-SFMessanger.debug.xcconfig'. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or
- Remove the build settings from the target.

[!] The `SFMessanger [Release]` target overrides the `HEADER_SEARCH_PATHS` build setting defined in `Pods/Target Support Files/Pods-SFMessanger/Pods-SFMessanger.release.xcconfig'. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or
- Remove the build settings from the target.

[!] The `SFMessanger [Release]` target overrides the `OTHER_LDFLAGS` build setting defined in `Pods/Target Support Files/Pods-SFMessanger/Pods-SFMessanger.release.xcconfig'. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or

- Remove the build settings from the target.

and you will met a build error then this will be helpful.


<Reference>
https://firebase.google.com/docs/ios/setup

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@import' when modules are disabled

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<Error Message> ......./RootViewController.h:13:1: Use of '@import' when modules are disabled [Solution] Xcode -> Build Settings -> Enable Modules -> Yes Xcode -> Build Settings -> Link Frameworks Automatically -> Yes Reference :  http://stackoverflow.com/questions/27479248/ios-use-of-import-when-modules-are-disabled-error
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MagicaVoxel black screen

<Error> When you run magicavoxel that it only gives you a black screen. <Solution> if you get black screen on MacOS, try this: extract the whole folder (go to the "MagicaVoxel" applications folder) move "MagicaVoxel-mac.app" outside the folder move "MagicaVoxel-mac.app" back to the folder again <Reference> raywenderich
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[Iphone][build error] pngcrush caught libpng error: PNG unsigned integer out of range.

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When xcode build says " pngcrush caught libpng error: PNG unsigned integer out of range. " Reference : http://stackoverflow.com/questions/17531255/how-do-i-fix-this-copypng-file-error <In my case following solution works> Build Phases -> Copy Bundle Resources, Any fileName is red color? Or Convert Logo Retina.png or Create it again, maybe it's an encoding\format issue. Or Rename "Logo Retina.png" to "LogoRetina.png". Good luck~ share improve this answer edited  Jun 30 '15 at 10:07 Ted 5,122 3 27 45 answered  Jul 8 '13 at 17:28
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