apple.metalperformanceshaders

Class MPSNNInitialGradient

java.lang.Object

org.moe.natj.general.NativeObject

org.moe.natj.objc.ObjCObject

apple.NSObject

apple.metalperformanceshaders.MPSKernel

apple.metalperformanceshaders.MPSCNNKernel

apple.metalperformanceshaders.MPSNNInitialGradient

All Implemented Interfaces:

NSCoding, NSCopying, NSSecureCoding, NSObject

public class MPSNNInitialGradient
extends MPSCNNKernel

MPSNNInitialGradient [@dependency] This depends on Metal.framework

The MPSCNNInitialGradient filter specifies a layer which computes the initial gradient for an aribitrary input image. The operation itself is extremely simple: it computes the gradient of the input image with itself, resulting in an output image which is filled with '1's for all the inputs that were used. This serves as the starting point for the computation of gradients between arbitrary images in a network. Example: Suppose that we want to compute gradients for a function that multiplies together two losses: f = f(L1, L2) = L1 * L2 The losses themselves are computed from some inputs x1,x2: L1 = L1(x1), L2 = L2(x2) The filters to compute f, L1, L2 are: f = MPSCNNMultiply(L1, L2), where L1 = MPSNNForwardLoss1(x1) and L2 = MPSNNForwardLoss1(x2)

To compute df/dx1 we apply the chain rule:

df/dx1 = d(L1 * L2)/dx1 = d(L1 * L2)/dL1 * dL1/dx1 + d(L1 * L2)/dL2 * dL2/dx1 = d(L1 * L2)/dL1 * dL1/dx1 = L2 * dL1/dx1

The MPSCNNMultiplyGradient filter computes for f = L1 * L2 forward op: dL/dL1 = dL/df * df/dL1 = dL/df * L2 and dL/dL2 = dL/df * df/dL2 = dL/df * L1 where dL/df is the input gradient of the chain rule / backpropagation algorithm. But in our case we want MPSCNNMultiplyGradient to compute the gradient: df/dL1 = d(L1 * L2)/dL1 = L2, which shows that L = f, which means that dL/dL1 = df/df * df/dL1 = 1 * L2, which shows that we get the correct gradient by providing unit input as input gradient to the MPSCNNMultiplyGradient.

Nested Class Summary

Nested classes/interfaces inherited from class apple.NSObject

NSObject.Function_instanceMethodForSelector_ret, NSObject.Function_methodForSelector_ret

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MPSNNInitialGradient(org.moe.natj.general.Pointer peer)

Method Summary

Modifier and Type	Method and Description
boolean	_supportsSecureCoding() This property must return YES on all classes that allow secure coding.
static boolean	accessInstanceVariablesDirectly()
static MPSNNInitialGradient	alloc()
static MPSNNInitialGradient	allocWithZone(org.moe.natj.general.ptr.VoidPtr zone)
static boolean	automaticallyNotifiesObserversForKey(java.lang.String key)
static void	cancelPreviousPerformRequestsWithTarget(java.lang.Object aTarget)
static void	cancelPreviousPerformRequestsWithTargetSelectorObject(java.lang.Object aTarget, org.moe.natj.objc.SEL aSelector, java.lang.Object anArgument)
static NSArray<java.lang.String>	classFallbacksForKeyedArchiver()
static org.moe.natj.objc.Class	classForKeyedUnarchiver()
static java.lang.String	debugDescription_static()
static java.lang.String	description_static()
static long	hash_static()
MPSNNInitialGradient	init()
MPSNNInitialGradient	initWithCoder(NSCoder aDecoder) NS_DESIGNATED_INITIALIZER
MPSNNInitialGradient	initWithCoderDevice(NSCoder aDecoder, java.lang.Object device) NSSecureCoding compatability
MPSNNInitialGradient	initWithDevice(java.lang.Object device) Initializes a MPSNNInitialGradient kernel.
static NSObject.Function_instanceMethodForSelector_ret	instanceMethodForSelector(org.moe.natj.objc.SEL aSelector)
static NSMethodSignature	instanceMethodSignatureForSelector(org.moe.natj.objc.SEL aSelector)
static boolean	instancesRespondToSelector(org.moe.natj.objc.SEL aSelector)
static boolean	isSubclassOfClass(org.moe.natj.objc.Class aClass)
static NSSet<java.lang.String>	keyPathsForValuesAffectingValueForKey(java.lang.String key)
static MPSNNInitialGradient	new_objc()
static boolean	resolveClassMethod(org.moe.natj.objc.SEL sel)
static boolean	resolveInstanceMethod(org.moe.natj.objc.SEL sel)
static void	setVersion_static(long aVersion)
static org.moe.natj.objc.Class	superclass_static()
static boolean	supportsSecureCoding()
static long	version_static()

Methods inherited from class apple.metalperformanceshaders.MPSCNNKernel

appendBatchBarrier, clipRect, destinationFeatureChannelOffset, destinationImageAllocator, destinationImageDescriptorForSourceImagesSourceStates, dilationRateX, dilationRateY, edgeMode, encodeToCommandBufferSourceImage, encodeToCommandBufferSourceImageDestinationImage, encodeToCommandBufferSourceImageDestinationStateDestinationImage, encodeToCommandBufferSourceImageDestinationStateDestinationStateIsTemporary, encodingStorageSizeForSourceImageSourceStatesDestinationImage, isBackwards, isResultStateReusedAcrossBatch, isStateModified, kernelHeight, kernelWidth, offset, padding, resultStateForSourceImageSourceStatesDestinationImage, setClipRect, setDestinationFeatureChannelOffset, setDestinationImageAllocator, setEdgeMode, setOffset, setPadding, setSourceFeatureChannelMaxCount, setSourceFeatureChannelOffset, sourceFeatureChannelMaxCount, sourceFeatureChannelOffset, strideInPixelsX, strideInPixelsY, temporaryResultStateForCommandBufferSourceImageSourceStatesDestinationImage

Methods inherited from class apple.metalperformanceshaders.MPSKernel

copyWithZone, copyWithZoneDevice, device, encodeWithCoder, label, options, setLabel, setOptions

Methods inherited from class apple.NSObject

accessibilityActivate, accessibilityActivationPoint, accessibilityAssistiveTechnologyFocusedIdentifiers, accessibilityAttributedHint, accessibilityAttributedLabel, accessibilityAttributedUserInputLabels, accessibilityAttributedValue, accessibilityContainerType, accessibilityCustomActions, accessibilityCustomRotors, accessibilityDecrement, accessibilityDragSourceDescriptors, accessibilityDropPointDescriptors, accessibilityElementAtIndex, accessibilityElementCount, accessibilityElementDidBecomeFocused, accessibilityElementDidLoseFocus, accessibilityElementIsFocused, accessibilityElements, accessibilityElementsHidden, accessibilityFrame, accessibilityHint, accessibilityIncrement, accessibilityLabel, accessibilityLanguage, accessibilityNavigationStyle, accessibilityPath, accessibilityPerformEscape, accessibilityPerformMagicTap, accessibilityRespondsToUserInteraction, accessibilityScroll, accessibilityTextualContext, accessibilityTraits, accessibilityUserInputLabels, accessibilityValue, accessibilityViewIsModal, addObserverForKeyPathOptionsContext, attemptRecoveryFromErrorOptionIndex, attemptRecoveryFromErrorOptionIndexDelegateDidRecoverSelectorContextInfo, autoContentAccessingProxy, awakeAfterUsingCoder, awakeFromNib, class_objc, classForCoder, classForKeyedArchiver, copy, dealloc, debugDescription, description, dictionaryWithValuesForKeys, didChangeValueForKey, didChangeValueForKeyWithSetMutationUsingObjects, didChangeValuesAtIndexesForKey, doesNotRecognizeSelector, fileManagerShouldProceedAfterError, fileManagerWillProcessPath, finalize_objc, forwardingTargetForSelector, forwardInvocation, hash, indexOfAccessibilityElement, isAccessibilityElement, isEqual, isKindOfClass, isMemberOfClass, isProxy, methodForSelector, methodSignatureForSelector, mutableArrayValueForKey, mutableArrayValueForKeyPath, mutableCopy, mutableOrderedSetValueForKey, mutableOrderedSetValueForKeyPath, mutableSetValueForKey, mutableSetValueForKeyPath, observationInfo, observeValueForKeyPathOfObjectChangeContext, performSelector, performSelectorInBackgroundWithObject, performSelectorOnMainThreadWithObjectWaitUntilDone, performSelectorOnMainThreadWithObjectWaitUntilDoneModes, performSelectorOnThreadWithObjectWaitUntilDone, performSelectorOnThreadWithObjectWaitUntilDoneModes, performSelectorWithObject, performSelectorWithObjectAfterDelay, performSelectorWithObjectAfterDelayInModes, performSelectorWithObjectWithObject, prepareForInterfaceBuilder, provideImageDataBytesPerRowOrigin_Size_UserInfo, removeObserverForKeyPath, removeObserverForKeyPathContext, replacementObjectForCoder, replacementObjectForKeyedArchiver, respondsToSelector, self, setAccessibilityActivationPoint, setAccessibilityAttributedHint, setAccessibilityAttributedLabel, setAccessibilityAttributedUserInputLabels, setAccessibilityAttributedValue, setAccessibilityContainerType, setAccessibilityCustomActions, setAccessibilityCustomRotors, setAccessibilityDragSourceDescriptors, setAccessibilityDropPointDescriptors, setAccessibilityElements, setAccessibilityElementsHidden, setAccessibilityFrame, setAccessibilityHint, setAccessibilityLabel, setAccessibilityLanguage, setAccessibilityNavigationStyle, setAccessibilityPath, setAccessibilityRespondsToUserInteraction, setAccessibilityTextualContext, setAccessibilityTraits, setAccessibilityUserInputLabels, setAccessibilityValue, setAccessibilityViewIsModal, setIsAccessibilityElement, setNilValueForKey, setObservationInfo, setShouldGroupAccessibilityChildren, setValueForKey, setValueForKeyPath, setValueForUndefinedKey, setValuesForKeysWithDictionary, shouldGroupAccessibilityChildren, superclass, validateValueForKeyError, validateValueForKeyPathError, valueForKey, valueForKeyPath, valueForUndefinedKey, willChangeValueForKey, willChangeValueForKeyWithSetMutationUsingObjects, willChangeValuesAtIndexesForKey

Methods inherited from class org.moe.natj.objc.ObjCObject

equals, toString

Methods inherited from class org.moe.natj.general.NativeObject

finalize, getPeer, getPeerPointer

Methods inherited from class java.lang.Object

clone, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MPSNNInitialGradient

protected MPSNNInitialGradient(org.moe.natj.general.Pointer peer)

Method Detail

accessInstanceVariablesDirectly

public static boolean accessInstanceVariablesDirectly()

alloc

public static MPSNNInitialGradient alloc()

allocWithZone

public static MPSNNInitialGradient allocWithZone(org.moe.natj.general.ptr.VoidPtr zone)

automaticallyNotifiesObserversForKey

public static boolean automaticallyNotifiesObserversForKey(java.lang.String key)

cancelPreviousPerformRequestsWithTarget

public static void cancelPreviousPerformRequestsWithTarget(java.lang.Object aTarget)

cancelPreviousPerformRequestsWithTargetSelectorObject

public static void cancelPreviousPerformRequestsWithTargetSelectorObject(java.lang.Object aTarget,
                                                                         org.moe.natj.objc.SEL aSelector,
                                                                         java.lang.Object anArgument)

classFallbacksForKeyedArchiver

public static NSArray<java.lang.String> classFallbacksForKeyedArchiver()

classForKeyedUnarchiver

public static org.moe.natj.objc.Class classForKeyedUnarchiver()

debugDescription_static

public static java.lang.String debugDescription_static()

description_static

public static java.lang.String description_static()

hash_static

public static long hash_static()

init

public MPSNNInitialGradient init()

Overrides:

init in class MPSCNNKernel

initWithCoder

public MPSNNInitialGradient initWithCoder(NSCoder aDecoder)

Description copied from interface: NSCoding

NS_DESIGNATED_INITIALIZER

Specified by:

initWithCoder in interface NSCoding

Overrides:

initWithCoder in class MPSCNNKernel

initWithCoderDevice

public MPSNNInitialGradient initWithCoderDevice(NSCoder aDecoder,
                                                java.lang.Object device)

Description copied from class: MPSCNNKernel

NSSecureCoding compatability

While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know which device your data is allocated on, we have to guess and may guess incorrectly. To avoid that problem, use initWithCoder:device instead.

Overrides:

initWithCoderDevice in class MPSCNNKernel

Parameters:

aDecoder - The NSCoder subclass with your serialized MPSKernel

device - The MTLDevice on which to make the MPSKernel

Returns:

A new MPSKernel object, or nil if failure.

initWithDevice

public MPSNNInitialGradient initWithDevice(java.lang.Object device)

Initializes a MPSNNInitialGradient kernel.

Overrides:

initWithDevice in class MPSCNNKernel

Parameters:

device - The MTLDevice on which this MPSNNInitialGradient filter will be used.

Returns:

A valid MPSNNInitialGradient object or nil, if failure.

instanceMethodForSelector

public static NSObject.Function_instanceMethodForSelector_ret instanceMethodForSelector(org.moe.natj.objc.SEL aSelector)

instanceMethodSignatureForSelector

public static NSMethodSignature instanceMethodSignatureForSelector(org.moe.natj.objc.SEL aSelector)

instancesRespondToSelector

public static boolean instancesRespondToSelector(org.moe.natj.objc.SEL aSelector)

isSubclassOfClass

public static boolean isSubclassOfClass(org.moe.natj.objc.Class aClass)

keyPathsForValuesAffectingValueForKey

public static NSSet<java.lang.String> keyPathsForValuesAffectingValueForKey(java.lang.String key)

new_objc

public static MPSNNInitialGradient new_objc()

resolveClassMethod

public static boolean resolveClassMethod(org.moe.natj.objc.SEL sel)

resolveInstanceMethod

public static boolean resolveInstanceMethod(org.moe.natj.objc.SEL sel)

setVersion_static

public static void setVersion_static(long aVersion)

superclass_static

public static org.moe.natj.objc.Class superclass_static()

supportsSecureCoding

public static boolean supportsSecureCoding()

_supportsSecureCoding

public boolean _supportsSecureCoding()

Description copied from interface: NSSecureCoding

This property must return YES on all classes that allow secure coding. Subclasses of classes that adopt NSSecureCoding and override initWithCoder: must also override this method and return YES. The Secure Coding Guide should be consulted when writing methods that decode data.

Specified by:

_supportsSecureCoding in interface NSSecureCoding

Overrides:

_supportsSecureCoding in class MPSCNNKernel

version_static

public static long version_static()