NAME

MPSCNNMultiplyGradient

SYNOPSIS

#import <MPSCNNMath.h>

Inherits MPSCNNArithmeticGradient.

Instance Methods

(nonnull instancetype) - initWithDevice:isSecondarySourceFilter:

Detailed Description

This depends on Metal.framework. Specifies the multiplication gradient operator. This arithmetic gradient filter requires the following inputs: gradient image from the previous layer (going backwards) and either the primary or the secondary source image from the forward pass. You will need a separate filter for the primary and secondary source images.

Without broadcasting, the arithmetic multiply gradient operation is an element-wise multiplication operation between the gradient image from the previous layer (going backwards) and:

The secondary source image from the forward pass for the primary source filter (for x * y, d/dx(x * y) = y).
The primary source image from the forward pass for the secondary source filter (for x * y, d/dy(x * y) = x).

Setting the broadcasting parameters results in a reduction operation (sum) across all of the applicable broadcasting dimensions (rows, columns, feature channels, or any combination thereof) to produce the destination image of the size that matches the primary/secondary input images used in the forward pass.

Method Documentation

- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device(BOOL) isSecondarySourceFilter

Initialize the multiplication gradient operator.

Parameters:

device The device the filter will run on.
isSecondarySourceFilter A boolean indicating whether the arithmetic gradient filter is operating on the primary or secondary source image from the forward pass.

Returns:

A valid MPSCNNMultiplyGradient object or nil, if failure.

Reimplemented from MPSCNNArithmeticGradient.

Author

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