[jira] [Resolved] (SINGA-341) Add stride field to Tensor class

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

     [ https://issues.apache.org/jira/browse/SINGA-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

wangwei resolved SINGA-341.
---------------------------
    Resolution: Fixed

> Add stride field to Tensor class
> --------------------------------
>
>                 Key: SINGA-341
>                 URL: https://issues.apache.org/jira/browse/SINGA-341
>             Project: Singa
>          Issue Type: Improvement
>            Reporter: wangwei
>            Priority: Major
>
> The current Tensor class stores data in a contiguous chunk of memory. It is a very simple implementation. However, it is difficult to support some operations. For example,
> {code}
> Tensor a = b.transpose()
> Tensor d = a + c
> {code}
>  
> Like other tensor implementation (e.g. numpy), Tensor a and b shares memory. The addition operation has to do real transpose, which incurs some overhead. With stride, we can avoid the transpose operation. Instead, we enumerate each element of a and c using the index, shape and stride information. https://stackoverflow.com/questions/32034237/how-does-numpys-transpose-method-permute-the-axes-of-an-array
> More over, stride is necessary for broadcasting operations. [https://stackoverflow.com/questions/39626233/how-did-numpy-implement-multi-dimensional-broadcasting.]
>  
> Code in src/core/tensor.cc tensor_math_cpp.h tensor_math_cuda.h needs modification when stride is added as a field/member of Tensor.



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