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mxnet sparse data format #30

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szilard opened this issue Nov 28, 2015 · 3 comments
Open

mxnet sparse data format #30

szilard opened this issue Nov 28, 2015 · 3 comments

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@szilard
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szilard commented Nov 28, 2015

Motivation: I can't run mxnet on the 10M records airline set #29 because model.matrix crashes out of RAM (on g2.8xlarge with 60GB or RAM - largest available for GPU instances).

Using Matrix::sparse.model.matrix to encode the categorical data would be great (uses <2GB RAM), but I get:

Error in asMethod(object) : 
  Cholmod error 'problem too large' at file ../Core/cholmod_dense.c, line 105

Strangely on the 1M dataset I get another error:

Error: io.cc:50: Seems X, y was passed in a Row major way, MXNetR adopts a column major convention.
@szilard szilard changed the title mxnet sparse data mxnet sparse data format Nov 28, 2015
@szilard
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szilard commented Dec 1, 2015

@tqchen @hetong007 Is sparse representation on the roadmap? - see thread above (I know mxnet is very new, and I have to tell you I think it already looks pretty great).

@tqchen
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tqchen commented Dec 2, 2015

Yes, this is something we should look into, can you also open an issue on https://github.com/dmlc/mxnet/issues ? Thanks

@szilard
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szilard commented Dec 2, 2015

Cool, I'll do it soon.

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