[GitHub] Sinnombre opened a new issue #9737: dot product backwards in R

[GitBox <gi...@apache.org>]

Sinnombre opened a new issue #9737: dot product backwards in R
URL: https://github.com/apache/incubator-mxnet/issues/9737
 
 
   ## Description
   When using R, the routine mx.nd.dot processes the inputs in the wrong order. See example below. A 1x3 vector dot a 3x1 vector should be a scalar, and a 3x1 dot 1x3 should be 3x3, not the other way around. I'm guessing this has to do with R being column major instead of row major.
   
   ## Environment info (Required)
   > sessionInfo()
   R version 3.4.3 (2017-11-30)
   Platform: x86_64-w64-mingw32/x64 (64-bit)
   Running under: Windows >= 8 x64 (build 9200)
   
   Matrix products: default
   
   locale:
   [1] LC_COLLATE=English_United States.1252 
   [2] LC_CTYPE=English_United States.1252   
   [3] LC_MONETARY=English_United States.1252
   [4] LC_NUMERIC=C                          
   [5] LC_TIME=English_United States.1252    
   
   attached base packages:
   [1] stats     graphics  grDevices utils     datasets 
   [6] methods   base     
   
   other attached packages:
   [1] mxnet_0.10.1
   
   loaded via a namespace (and not attached):
    [1] Rcpp_0.12.14       compiler_3.4.3    
    [3] RColorBrewer_1.1-2 influenceR_0.1.0  
    [5] plyr_1.8.4         bindr_0.1         
    [7] viridis_0.5.0      tools_3.4.3       
    [9] digest_0.6.12      jsonlite_1.5      
   [11] viridisLite_0.3.0  tibble_1.3.4      
   [13] gtable_0.2.0       rgexf_0.15.3      
   [15] pkgconfig_2.0.1    rlang_0.1.4       
   [17] igraph_1.1.2       rstudioapi_0.7    
   [19] bindrcpp_0.2       gridExtra_2.3     
   [21] downloader_0.4     DiagrammeR_0.9.2  
   [23] dplyr_0.7.4        stringr_1.2.0     
   [25] htmlwidgets_1.0    hms_0.4.1         
   [27] grid_3.4.3         glue_1.2.0        
   [29] R6_2.2.2           Rook_1.1-1        
   [31] XML_3.98-1.9       readr_1.1.1       
   [33] purrr_0.2.4        tidyr_0.8.0       
   [35] ggplot2_2.2.1      magrittr_1.5      
   [37] codetools_0.2-15   scales_0.5.0      
   [39] htmltools_0.3.6    assertthat_0.2.0  
   [41] colorspace_1.3-2   brew_1.0-6        
   [43] stringi_1.1.6      visNetwork_2.0.3  
   [45] lazyeval_0.2.1     munsell_0.4.3 
   
   ## Error Message:
   N/A
   
   ## Minimum reproducible example
   > a <- mx.nd.ones(c(1,3), ctx = mx.cpu())
   > b <- mx.nd.ones(c(3,1), ctx = mx.cpu())
   > a
        [,1] [,2] [,3]
   [1,]    1    1    1
   > b
        [,1]
   [1,]    1
   [2,]    1
   [3,]    1
   > mx.nd.dot(a,b)
        [,1] [,2] [,3]
   [1,]    1    1    1
   [2,]    1    1    1
   [3,]    1    1    1
   > mx.nd.dot(b,a)
        [,1]
   [1,]    3
   
   

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