Summary: Pico2 demo of simple neural network (MNIST)

[pytorchbot]

Test Plan:

1. Setup Conda
2. examples/arm/setup.sh --i-agree-to-the-contained-eula; source examples/ arm/ethos-u-scratch/setup_path.sh
3. cd examples/raspberry_pi/pico2
4. python export_mlp_mnist.py
5. ./build_firmware_pico.sh --model=balanced_tiny_mlp_mnist.pte
   Results:

PREDICTED: 4 (Expected: 4) ✅ CORRECT!

==================================================

=== Digit 7 ===

          #############
          #############
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                      ####  
                     ####   
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Input stats: 159 white pixels out of 784 total
Running neural network inference...
✅ Neural network results:
Digit 0: 370.000
Digit 1: 0.000
Digit 2: -3.000
Digit 3: -3.000
Digit 4: 860.000
Digit 5: -3.000
Digit 6: -3.000
Digit 7: 1640.000 ← PREDICTED
Digit 8: -3.000
Digit 9: -3.000

� PREDICTED: 7 (Expected: 7) ✅ CORRECT!

==================================================

� All tests complete! PyTorch neural network works on Pico2!

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Summary

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Test plan

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[pytorch-bot]

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❌ 1 New Failure, 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 46676e5 with merge base e0dda90 ():

NEW FAILURE - The following job has failed:

• pull / test-models-linux-basic (mv3, xnnpack-quantization-delegation, cmake, linux.arm64.2xlarge, execut... / linux-job (gh)
  RuntimeError: Command docker exec -t 2f1eced004c5d45758d170d12ed3c4e25c3b32ec306d6764963a36be66c64f01 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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