GPU Unpack, take three

[jaycedowell]

Add support for GPU-based unpacking and quantization (third attempt). This includes:

• GPU functions for unpacking integer data into 'i8'/'ci8'
• Functions to unpack integer data and promote to float/double
• Support for unpacking 1-bit data as:
  • 0 unpacks to -1
  • 1 unpacks to 1
    • Preliminary support for packing into 'i2'/'ci2' and 'i1'/'ci1'. Full support held up by a check for padded arrays.

[jaycedowell]

This approach to building the unpacking and quantization modules works on ADP but it seems to cause problems with travis. Is there a more robust way to deal with this that doesn't lead to maintaining two sets of files?

[benbarsdell]

Would passing "-x c++" to g++ help?

Alternatively, can you move the cuda code into a separate .cu + .hpp and guard calls to it from the .cpp with ifndef NOCUDA?

[jaycedowell]

I had something similar to the "-x c++" before that did work right either. Maybe I should revisit this approach before splitting things up.

[coveralls]

Coverage remained the same at 65.625% when pulling 1dc3f2f06bbf0bffde45125ac8d2a6c1ebbe43fd on jaycedowell-gpu-unpack into 84891770f905b786d8c302695ad4928e80ee7a3a on master.

[coveralls]

Coverage increased (+0.3%) to 65.931% when pulling 1dc3f2f06bbf0bffde45125ac8d2a6c1ebbe43fd on jaycedowell-gpu-unpack into 84891770f905b786d8c302695ad4928e80ee7a3a on master.

[jaycedowell]

What's up the these travis builds? The "details" link indicates that they have finished but here they are listed as still pending.

[codecov-io]

Codecov Report

Merging #103 into master will increase coverage by 0.6%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #103     +/-   ##
=========================================
+ Coverage   67.17%   67.77%   +0.6%     
=========================================
  Files          39       39             
  Lines        3555     3643     +88     
=========================================
+ Hits         2388     2469     +81     
- Misses       1167     1174      +7

Impacted Files	Coverage Δ
python/bifrost/blocks/serialize.py	91.27% <0%> (+1.11%)	:arrow_up:

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[MilesCranmer]

I clicked "restart build" just now and it passed. Not sure what that was - it could be because I was editing the travis settings at the same time as the build.