[jira] [Closed] (SYSTEMML-2131) Add support for bias_add and bias_mult

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-2131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm closed SYSTEMML-2131.
------------------------------------
       Resolution: Done
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.2

> Add support for bias_add and bias_mult
> --------------------------------------
>
>                 Key: SYSTEMML-2131
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2131
>             Project: SystemML
>          Issue Type: Sub-task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>            Priority: Major
>             Fix For: SystemML 1.2
>
>
> The functions bias_add and bias_mult (see http://apache.github.io/systemml/dml-language-reference for the semantics) are language constructs and operators that aim to improve performance by fusing element-wise operations with the replication of bias terms. For example, bias_add is defined as follows:
> {code}
> ones = matrix(1, rows=1, cols=height*width);
> output = input + matrix(bias %*% ones, rows=1, cols=numChannels*height*width)
> {code}
> The code generation frameworks will makes such custom operators obsolete. However, because bias_add and bias_mult are mapped to specific {{ConvolutionOp}} instances they are not yet supported by the codegen framework.
> In detail this task entails:
> 1) Create new cell template tests in {{functions.codegen.CellwiseTmplTest}} for both functions.
> 2) Modify the open/merge/close conditions for cell templates in {{codegen.template.TemplateCell}} 
> 3) Create a new codegen primitive for a mapped index lookups (for each cell in input we want to access a specific cell in the bias vector)
> 4) Modify the CPlan construction in {{codegen.template.TemplateCell}} to create binary plus or multiply and the mapped index lookup for all ConvolutionOp instances of type {{BIAS_ADD}} or {{BIAS_MULTIPLY}}



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