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Convert fixes #3967

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Convert fixes #3967

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convert: Fix detection of LLAMA2
Nov 6, 2023
f36a777
convert: Fix handling of LLAMA2 vocab_size = -1
Nov 6, 2023
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7 changes: 6 additions & 1 deletion convert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -250,9 +250,14 @@ def loadOriginalParamsJson(model: LazyModel, config_path: Path) -> Params:
if config.get("rope_theta") == 1000000:
# CodeLlama
n_ctx = 16384
elif config["norm_eps"] == 1e-05:
elif config["norm_eps"] in (1e-05, 1e-06):
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Then how do we detect LLaMA-1? See #2384

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Well, LLAMA2 files with norm_eps equal to 1e-06.

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@cebtenzzre cebtenzzre Nov 7, 2023 •
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Could you tell me where to get an original LLaMA-2 model with norm_eps=1e-6?

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Well I got it via the LLAMA2's repository download script and utilizing the link that was sent to my email. Since it's tied to my identity and accepting the EULA I'd say it's not prudent to share it? I guess if you create a new registration just now and try to download llama 7b you'd see it?

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I just downloaded LLaMA-2 7B and got this:

{"dim": 4096, "multiple_of": 256, "n_heads": 32, "n_layers": 32, "norm_eps": 1e-05, "vocab_size": -1}

So you'll have to be more specific.

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@lorddoskias lorddoskias Nov 7, 2023 •
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Ok, so I have actually downloaded llama2-7b-chat :

cat llama-2-7b-chat/params.json
{"dim": 4096, "multiple_of": 256, "n_heads": 32, "n_layers": 32, "norm_eps": 1e-06, "vocab_size": -1}

cat llama-2-7b-chat/checklist.chk
0c4837f3ef97f648452f91faed308a07 consolidated.00.pth
1c39bc3c6b51079fd807cc105b86c9df params.json

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I can confirm this.

@ggerganov Our "hack to determine LLaMA v1 vs v2" is apparently insufficient. Maybe we need a CLI arg to disambiguate?

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Ugh, this is quite messy. I guess we do need to add a CLI arg that would be required in cases where the vocab_size is -1. In such cases we abort and ask the user to specify explicitly LLaMA v1 or LLaMA v2.

# LLaMA v2
n_ctx = 4096
# For some reason FB writes -1 to vocab size for their LLAMA2 models
# simply remove this bogus value and let the return statement belo
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spelling

# figure it out
if config["vocab_size"] == -1:
del config["vocab_size"]
else:
# LLaMA v1
n_ctx = 2048
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