Integration of Fraunhofer SAMG as an alternative to PyAMG #70
Conversation
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How do you install PySAMG? I looked it up and couldn't find it anywhere. Thanks! |
Do you mean SAMG or PyAMG? PyAMG can be found here https://github.com/pyamg/pyamg for SAMG, please contact the Fraunhofer team as mentioned above. |
No, I mean PySAMG (line 29 of utils/eigendecomp.py). I have access to an SAMG license, which was acquired by my group a long time ago, but I can only call it through C++ or FORTRAN. I was wondering if PySAMG was a development of @jrsassen or if Fraunhofer SCAI had released a Python package. |
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I developed PySAMG (a Python interface for SAMG) during my time at Fraunhofer SCAI. It was never publicly released as SAMG itself is not publicly available, but (I hope) if you contact the SAMG team they should still have the code. |
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Thanks! I contacted them. |
We integrated Fraunhofer SAMG as an alternative to PyAMG as the preconditioner used in LOBPCG.
We tested this on the swiss roll as an artificial dataset and on the data from word2vec used in previous benchmarks of megaman. In both cases using SAMG proved to be significantly faster than using PyAMG. For example in our tests using SAMG on the data from word2vec we were able to achieve a speedup of the embedding process by a factor between 2 and 6.
Note though that Fraunhofer SAMG is a commercial software and one needs a license to use it. For more information on SAMG see here and for licensing (including test or educational licenses) contact [email protected].