| --- Log opened Mon Mar 18 00:00:56 2019 | ||
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| pilgrm | hi | 07:38 |
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| gf712 | wiking: hey | 11:34 |
| @wiking | ho | 11:34 |
| gf712 | do hou | 11:34 |
| @wiking | que? | 11:35 |
| gf712 | wiking: do you know an easy way to get the upper triangle of a sgmatrix? | 11:35 |
| gf712 | sorry pressed enter too early :p | 11:35 |
| @wiking | only with eigenmap | 11:35 |
| gf712 | would I be better off just copying in a loop then? | 11:36 |
| @wiking | mmm i mean if it's in cpu memory | 11:36 |
| @wiking | eigen upper triangular should we b fine | 11:36 |
| @wiking | as that's zero copy | 11:36 |
| gf712 | basically I calculate pairwise dist and then want the median | 11:36 |
| @wiking | https://eigen.tuxfamily.org/dox/classEigen_1_1TriangularView.html | 11:36 |
| gf712 | and its a waste doing median with the whole thing | 11:36 |
| @wiking | there's a typedef for mapping sgmatrix to eigen matrix | 11:37 |
| @wiking | EigenMatrixXtMap | 11:37 |
| @wiking | operator EigenMatrixXtMap() const; | 11:37 |
| @wiking | you get back an eigen matrix | 11:37 |
| @wiking | and u do that triangularview | 11:37 |
| gf712 | do you think getting upper and then median would be better than doing median of whole thing? | 11:38 |
| @wiking | well less iterations no? :)_ | 11:38 |
| gf712 | yup | 11:38 |
| @wiking | so then yes it's better | 11:38 |
| @wiking | :) | 11:38 |
| gf712 | I guess the triangular view would be quick | 11:38 |
| gf712 | aight | 11:38 |
| gf712 | any point adding that as a utility function in linalg | 11:38 |
| gf712 | ? | 11:39 |
| @wiking | you mean to get the upper triangular view? | 11:39 |
| gf712 | yes | 11:39 |
| @wiking | dunno if viennacl supports such operations | 11:39 |
| @wiking | hopefully yes | 11:39 |
| gf712 | I added median to linalg btw but it uses pure stl | 11:39 |
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| @wiking | lisitsyn: pingu | 14:05 |
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| --- Log closed Tue Mar 19 00:00:58 2019 | ||
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