.TH "MPSCNNLogSoftMaxGradient" 3 "Mon Jul 9 2018" "Version MetalPerformanceShaders-119.3" "MetalPerformanceShaders.framework" \" -*- nroff -*-
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.SH NAME
MPSCNNLogSoftMaxGradient
.SH SYNOPSIS
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\fC#import <MPSCNNSoftMax\&.h>\fP
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Inherits \fBMPSCNNGradientKernel\fP\&.
.SS "Instance Methods"

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.RI "(nonnull instancetype) \- \fBinitWithDevice:\fP"
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.RI "(nullable instancetype) \- \fBinitWithCoder:device:\fP"
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.SS "Additional Inherited Members"
.SH "Detailed Description"
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This depends on Metal\&.framework  The logSoftMax gradient filter calculates the gradient to be backpropagated\&. The logSoftMax gradient just as the log softMax filter, is applied across feature channels and at all spatial locations\&. It computes the gradient for a given output generated by the corresponding logSoftMax (i\&.e\&. \fBMPSCNNLogSoftMax\fP) layer and the gradient computed by the previous layer in the back-propagation pass\&. For each feature channel per pixel in an image in a feature map, the logSoftMax gradient filter computes the following: result gradient channel in pixel outputGradient(x,y,k) = inputGradient(x,y,k) - exp(logSoftMax(x,y,k)) * sum(inputGradient(x,y,0) \&.\&.\&. inputGradient(x,y,N-1)) where N is the number of feature channels
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The incoming gradient is the primary source\&. The original output of corresponding logSoftMax is the secondary source\&. 
.SH "Method Documentation"
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.SS "\- (nullable instancetype) \fBinitWithCoder:\fP (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device"
\fBNSSecureCoding\fP 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\&. 
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\fBParameters:\fP
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\fIaDecoder\fP The NSCoder subclass with your serialized \fBMPSKernel\fP 
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\fIdevice\fP The MTLDevice on which to make the \fBMPSKernel\fP 
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\fBReturns:\fP
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\fBA\fP new \fBMPSKernel\fP object, or nil if failure\&. 
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Reimplemented from \fBMPSCNNGradientKernel\fP\&.
.SS "\- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device"
Initializes a \fBMPSCNNLogSoftMaxGradient\fP function 
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\fBParameters:\fP
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\fIdevice\fP The MTLDevice on which this \fBMPSCNNLogSoftMaxGradient\fP filter will be used
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\fBReturns:\fP
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\fBA\fP valid \fBMPSCNNLogSoftMaxGradient\fP object or nil, if failure\&. 
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Reimplemented from \fBMPSCNNGradientKernel\fP\&.

.SH "Author"
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Generated automatically by Doxygen for MetalPerformanceShaders\&.framework from the source code\&.