[GitHub] [incubator-tvm] weberlo opened a new pull request #4274: [µTVM] Enable AutoTVM for ARM STM32F746XX Boards

[GitBox <gi...@apache.org>]

weberlo opened a new pull request #4274: [µTVM] Enable AutoTVM for ARM STM32F746XX Boards
URL: https://github.com/apache/incubator-tvm/pull/4274
 
 
   This PR adds support for autotuning via MicroTVM.  To test this infrastructure on a physical board, I have added support for ARM STM32F746XX boards, featuring Cortex-M7 CPUs.  As a followup to this PR, I will write a tutorial for tuning conv2d.
   
   Here are the most notable changes:
   - All components in the µTVM infra are now parameterized by the word size of the target device.
   - Device configuration has been expanded to include the memory layout, word size, and thumb mode indicator of the device.
   - There is now a `micro.device` Python namespace featuring a global registry of all supported devices.  The registry is indexed by device ID (e.g., `host`, `riscv_spike`, or `arm.stm32f746xx`). and maps to dictionaries containing two functions: `create_micro_lib` (for creating libraries specific to that device) and `default_config` (for generating default device-specific config).
   - The µTVM runtime API has been expanded to include timing functions, where each implementation is device-specific.`
   - There is new a `src/runtime/micro/device` folder which mirrors the structure of the `micro.device` folder and includes device initialization and timer implementations for each device.
   - RPC sessions will now use the `MicroTimeEvaluator` when possible, to make use of cycle-accurate timings available on microcontrollers, instead of using wall clock time (which would include communication overhead).
   
   Many thanks to @tqchen for discussing the design with me!
   
   CC @u99127 @ajtulloch @jwfromm 

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