MPSCNNLogSoftMax(3) MetalPerformanceShaders.framework MPSCNNLogSoftMax(3)NAME
MPSCNNLogSoftMax
SYNOPSIS
#import <MPSCNNSoftMax.h>
Inherits MPSCNNKernel.
Additional Inherited Members
Detailed Description
This depends on Metal.framework The logarithmic softMax filter can be achieved by taking the natural logarithm of the the result of the
softMax filter. The results are often used to construct a loss function to be minimized when training neural networks. For each feature
channel per pixel in an image in a feature map, the logarithmic softMax filter computes the following: result channel in pixel =
pixel(x,y,k)) - ln{sum(exp(pixel(x,y,0)) ... exp(pixel(x,y,N-1))} where N is the number of feature channels and y = ln{x} satisfies e^y =
x.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSCNNLogSoftMax(3)
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MPSCNNSoftMaxGradient(3) MetalPerformanceShaders.framework MPSCNNSoftMaxGradient(3)NAME
MPSCNNSoftMaxGradient
SYNOPSIS
#import <MPSCNNSoftMax.h>
Inherits MPSCNNGradientKernel.
Instance Methods
(nonnull instancetype) - initWithDevice:
(nullable instancetype) - initWithCoder:device:
Additional Inherited Members
Detailed Description
This depends on Metal.framework The softMax gradient filter calculates the gradient to be backpropagated. The softMax gradient just as the
softMax filter, is applied across feature channels and at all spatial locations. It computes the gradient for a given output generated by
the corresponding softMax (i.e. MPSCNNSoftMax) layer and the gradient computed by the previous layer in the back-propagation pass. For each
feature channel in an image in a feature map, the softMax gradient filter computes the following: result gradient channel in pixel
outputGradient(x,y,k) = softMax(x,y,k) * (inputGradient(x,y,k) - sum(inputGradient(x,y,0) * softMax(x,y,0) ... inputGradient(x,y,N-1) *
softMax(x,y,N-1))) where N is the number of feature channels
The incoming gradient is the primary source. The original output of corresponding softMax is the secondary source.
Method Documentation
- (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device
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.
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.
Reimplemented from MPSCNNGradientKernel.
- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device
Initializes a MPSCNNSoftMaxGradient function
Parameters:
device The MTLDevice on which this MPSCNNSoftMaxGradient filter will be used
Returns:
A valid MPSCNNSoftMaxGradient object or nil, if failure.
Reimplemented from MPSCNNGradientKernel.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSCNNSoftMaxGradient(3)
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