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Add LoihiRectifiedLinear neuron type #322

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@hunse hunse commented Dec 1, 2021

This is a rate neuron type to train deep networks for Loihi using Nengo or NengoDL. Since it is a rate neuron type, it must ultimitely be swapped for LoihiSpikingRectifiedLinear to run on Loihi.

Also minor speedup to hardware build
These were being tested before, it just wasn't evident/assured.
- Respect nengo.rc.rc.float_dtype where we can
- Use int32 in a number of places to reduce memory
To map connections to DecodeNeurons so that users can see which
connections have DecodeNeurons and get a handle to the relevant
Ensemble or LoihiBlock if necessary.
To reduce inter-chip communication.
To ensure that HAS_NXSDK is never false if nxsdk is installed.
@tbekolay tbekolay marked this pull request as draft December 13, 2021 21:16
@tbekolay tbekolay changed the title Draft: Add LoihiRectifiedLinear neuron type Add LoihiRectifiedLinear neuron type Dec 13, 2021
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