[Draft] Qualcomm AI Engine Direct - [WIP] llama2...

[chiwwang]

example/qualcomm/llama2/llama.py can be used like:

python examples/qualcomm/llama2/llama.py -a llama_only_quant \
-b build_android \
-m SM8650 \
--ptq 16a4w \
--tokenizer_model tokenizer.model \
--checkpoint stories110M.pt \
--params params.json \
--tokenizer_bin tokenizer.bin \
--prompt Once

Note that we don't have a runner for llama2 without split.

It's still FAR AWAY from a workable statically quantized llama2-7b.
Storiesllama-110M might work on 16a4w HTP. But please note that calibration() has not been done well.
Below is a reference command. But it can change anytime....

python examples/qualcomm/llama2/composite_llama.py \
-a storiesllama_16a4w \
-b build_android \
-s <device_id> \
-H <host_connecting_device> \
-m SM8650 \
--ptq 16a4w \
--tokenizer_model tokenizer.model \
--checkpoint stories110M.pt \
--params params.json \
--tokenizer_bin tokenizer.bin \
--prompt Once \
--temperature 0

What we did to optimize performance on HTP is listed:

1. One multihead attentions is transformed to multiple single head.
2. KV-cache is changed to graph I/O. The update is performed in qnn_llama_runner.cpp on CPU.
3. llama2 is partitioned to 6 pte files in examples/qualcomm/llama2/composite_llama.py
4. Embedding is quantized. This might need further investigation, e.g., can we move it out of the model and run on CPU..etc
5. Support u16 and u8 mixed-precision quantization.
6. KV-cache is left as quantized format in graph I/O.
7. RMSNorm is tweaked a bit to reduce the quantization sensitivity.
8. HTP Spill-Fill buffer feature is used among pte files.
9. Convert all Linear layers to Conv2d.
10. 10 Properly set quant_min and quant_max in Observers to offset=128 in symmetrical quantization.

[pytorch-bot]

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❌ 3 New Failures

As of commit aaada7f with merge base 4008600 ():

NEW FAILURES - The following jobs have failed:

• Android / test-llama-app / mobile-job (android) (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers
• Apple / upload-frameworks-ios (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers
• Lint / lintrunner / linux-job (gh)
  >>> Lint for exir/program/_fake_program.py:

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[chiwwang]

Please see #4142 instead.