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78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
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#!/usr/bin/env python
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'''
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Fetches the Jinja chat template of a HuggingFace model.
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If a model has multiple chat templates, you can specify the variant name.
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Syntax:
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./scripts/get_hf_chat_template.py model_id [variant]
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Examples:
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./scripts/get_hf_chat_template.py NousResearch/Meta-Llama-3-8B-Instruct
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./scripts/get_hf_chat_template.py NousResearch/Hermes-3-Llama-3.1-8B tool_use
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./scripts/get_hf_chat_template.py meta-llama/Llama-3.2-3B-Instruct
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'''
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import json
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import re
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import sys
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def get_hf_chat_template(model_id, variant=None):
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try:
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# Use huggingface_hub library if available.
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# Allows access to gated models if the user has access and ran `huggingface-cli login`.
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from huggingface_hub import hf_hub_download
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with open(hf_hub_download(repo_id=model_id, filename="tokenizer_config.json")) as f:
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config_str = f.read()
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except ImportError:
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import requests
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assert re.match(r"^[\w.-]+/[\w.-]+$", model_id), f"Invalid model ID: {model_id}"
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response = requests.get(f"https://huggingface.co/{model_id}/resolve/main/tokenizer_config.json")
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if response.status_code == 401:
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raise Exception('Access to this model is gated, please request access, authenticate with `huggingface-cli login` and make sure to run `pip install huggingface_hub`')
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response.raise_for_status()
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config_str = response.text
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try:
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config = json.loads(config_str)
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except json.JSONDecodeError:
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# Fix https://huggingface.co/NousResearch/Meta-Llama-3-8B-Instruct/blob/main/tokenizer_config.json
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# (Remove extra '}' near the end of the file)
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config = json.loads(re.sub(r'\}([\n\s]*\}[\n\s]*\],[\n\s]*"clean_up_tokenization_spaces")', r'\1', config_str))
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chat_template = config['chat_template']
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if isinstance(chat_template, str):
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return chat_template
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else:
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variants = {
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ct['name']: ct['template']
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for ct in chat_template
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}
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def format_variants():
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return ', '.join(f'"{v}"' for v in variants.keys())
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if variant is None:
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if 'default' not in variants:
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raise Exception(f'Please specify a chat template variant (one of {format_variants()})')
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variant = 'default'
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sys.stderr.write(f'Note: picked "default" chat template variant (out of {format_variants()})\n')
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elif variant not in variants:
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raise Exception(f"Variant {variant} not found in chat template (found {format_variants()})")
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return variants[variant]
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def main(args):
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if len(args) < 1:
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raise ValueError("Please provide a model ID and an optional variant name")
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model_id = args[0]
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variant = None if len(args) < 2 else args[1]
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template = get_hf_chat_template(model_id, variant)
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sys.stdout.write(template)
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if __name__ == '__main__':
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main(sys.argv[1:])
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