Add missing inference support for GPTNeoXForCausalLM (Pythia and GPT-NeoX base models) by fairydreaming · Pull Request #7461 · ggml-org/llama.cpp

fairydreaming · 2024-05-22T12:24:01Z

This pull request adds missing pieces to support inference for GPT-NeoX-based models like the GPT-NeoX and the Pythia family. Fixes #742. It also adds model types for all Pythia model sizes.
Added use_par_res hparams field corresponds to the use_parallel_residual parameter from config.json.

…e models).

ggerganov · 2024-05-22T13:13:59Z

Tested with https://huggingface.co/EleutherAI/pythia-1.4b/tree/main

Seems to work. PPL on wiki.test is 12.8692 +/- 0.09260:

./perplexity -m models/pythia-1b/ggml-model-f16.gguf -f build/wikitext-2-raw/wiki.test.raw

I guess it's normal for 1.4B model that is 1 year old. Thanks for implementing this

fairydreaming · 2024-05-22T13:18:59Z

It seems that the perplexity is a little higher compared to the HF transformers implementation because there are differences in tokenization output between llama.cpp and GPTNeoXTokenizerFast.
Edit: It looks that there are differences in dataset files that I used for measuring perplexity for transformers and llama.cpp, will have to recheck.

github-actions · 2024-05-22T13:37:40Z

📈 llama.cpp server for bench-server-baseline on Standard_NC4as_T4_v3 for phi-2-q4_0: 537 iterations 🚀

Expand details for performance related PR only

Concurrent users: 8, duration: 10m
HTTP request : avg=8705.59ms p(95)=22299.26ms fails=, finish reason: stop=480 truncated=57
Prompt processing (pp): avg=103.68tk/s p(95)=455.27tk/s
Token generation (tg): avg=31.86tk/s p(95)=47.22tk/s
ggml-org/models/phi-2/ggml-model-q4_0.gguf parallel=8 ctx-size=16384 ngl=33 batch-size=2048 ubatch-size=256 pp=1024 pp+tg=2048 branch=gpt-neox commit=7e171de882ca16fbd75f72d7d1dd4afef75c04d6

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ggerganov · 2024-05-22T14:30:08Z

The tokenization differences on wiki.test are minimal and related to slightly different way that we handle added tokens:

diff ./build/wikitext-2-raw/wiki.test.raw.tok ./build/wikitext-2-raw/wiki.test.raw.tokcpp
245413,245414c245413,245414
< 50276
< 6285
---
> 209
> 20589
245440,245441c245440,245441
< 50276
< 6285
---
> 209
> 20589
246660,246661c246660,246661
< 50276
< 6285
---
> 209
> 20589
246687,246688c246687,246688
< 50276
< 6285
---
> 209
> 20589

Likely the perplexity computation used in the HF transformers differs from llama.cpp (i.e. different context size, strided evaluation, etc.)

For Pythia 2.8b I get PPL 10.9294 +/- 0.07654

ggerganov · 2024-05-22T14:33:15Z

Edit: It looks that there are differences in dataset files that I used for measuring perplexity for transformers and llama.cpp, will have to recheck.

Feel free to merge this when ready - I think it works

…EOX - didn't notice it was already present

felladrin · 2024-05-23T10:08:56Z

Thank you for this, @fairydreaming! I have wanted it for so long!
And thanks @ggerganov for reviewing it so quickly!

sszymczy added 2 commits May 22, 2024 12:09

Added missing support for GPTNeoXForCausalLM (Pythia and GPT-NeoX bas…

720e886

…e models).

Merge remote-tracking branch 'upstream/master' into gpt-neox

d8b8ecf

github-actions bot added the python python script changes label May 22, 2024

ggerganov approved these changes May 22, 2024

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cebtenzzre linked an issue May 22, 2024 that may be closed by this pull request

GPT-NeoX has only minimal inference support #3293

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ggerganov mentioned this pull request May 22, 2024

ci : start using Pythia models over OpenLlama #7470

Merged

sszymczy added 2 commits May 22, 2024 20:54

llama : added missing model type for the smallest pythia-14m

1aa777f

llama : remove duplicate LLM_TENSOR_NAMES map entry for LLM_ARCH_GPTN…

5234723

…EOX - didn't notice it was already present

mofosyne added model Model specific Review Complexity : Medium Generally require more time to grok but manageable by beginner to medium expertise level labels May 23, 2024

sszymczy and others added 3 commits May 23, 2024 08:34

llama : add comments for clarity, change confusing variable name

0f3bf7c

llama : whitespace formatting fixes

fcc8f82

Merge branch 'ggerganov:master' into gpt-neox

7e171de

fairydreaming merged commit 9b82476 into ggml-org:master May 23, 2024

felladrin mentioned this pull request May 23, 2024

Add GPT-NeoX + Pythia to the list of supported models #7491

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Add missing inference support for GPTNeoXForCausalLM (Pythia and GPT-NeoX base models)#7461

Add missing inference support for GPTNeoXForCausalLM (Pythia and GPT-NeoX base models)#7461
fairydreaming merged 7 commits intoggml-org:masterfrom
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