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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> NumPy-Discussion <numpy-discussion-bounces+kmckenna=baselinesw.com@python.org> <b>On Behalf Of </b>Charles R Harris<br><b>Sent:</b> Saturday, March 16, 2019 12:06 PM<br><b>To:</b> Discussion of Numerical Python <numpy-discussion@python.org><br><b>Subject:</b> [SPAM]Re: [Numpy-discussion] introducing Numpy.net, a pure C# implementation of Numpy<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sat, Mar 16, 2019 at 10:02 AM Charles R Harris <<a href="mailto:charlesr.harris@gmail.com">charlesr.harris@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sat, Mar 16, 2019 at 4:41 AM <<a href="mailto:kmckenna@baselinesw.com" target="_blank">kmckenna@baselinesw.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>This is a quick note to announce open source <a href="http://numpy.net" target="_blank">numpy.net</a> available at this repository<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a href="https://github.com/Quansight-Labs/numpy.net" target="_blank">https://github.com/Quansight-Labs/numpy.net</a><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>This is a pure C# based implementation of Numpy, ported from the underlying C library and the python application layer.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Written and tested on .NET standard 2.1 so it will run anywhere.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I have the vast majority of the most commonly used functions implemented and unit tested. It supports fully functional slicing and views.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Verified to generate binary compatible output with python numpy.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I built it because I was tasked with porting a large Python Numpy application to C# and as you may know, there are not a lot of good solutions (until now). My employer graciously agreed to open source it.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>If you have some time to review it, I'd love to get some feedback from some Numpy experts (I don't consider myself one).<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I believe it is ready to start building tools like SciPy on top of it.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Longer term, I would like to see this ported to Java. I expect pure C# to port easily to Java.<o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>That's interesting. What parts are in C#? Any benchmarks comparing the two implementations?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>What about BLAS libraries?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><ol style='margin-top:0in' start=1 type=1><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo1'>All of it is in C#. The underlying C code was ported and so was the python layer.<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo1'>Benchmarks? If you mean performance benchmarks, I have nothing official but I will say that the C# implementation is not as fast as the optimized C code and it never will be. The only place you would really notice it is if you were doing a UFUNC operation on a large array.<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo1'>I am not a numpy programmer so I don’t know what BLAS libraries are. I just did a quick google and my guess is that this is not relevant in my implementation.<o:p></o:p></li></ol><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I envision my tool to be used if someone wants to port a numpy application to .NET or wants to do Numpy things in a .NET application,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Kevin<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>