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From "Govinda Malavipathirana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-2131) Add support for bias_add and bias_mult
Date Sat, 03 Mar 2018 18:49:00 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-2131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384805#comment-16384805
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Govinda Malavipathirana commented on SYSTEMML-2131:
---------------------------------------------------

Looked into the code much but it bit of hard to understand. Specially when comes to the TEST,
What's the different between  ExecType.SPARK and ExecType.CP, and how the TEST execution
works?

> 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
>            Priority: Major
>
> 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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