Tool call support (generic + native for Llama, Functionary, Hermes, Mistral, Firefunction, DeepSeek) w/ lazy grammars (#9639)

---------

Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

scripts/get_chat_template.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+'''
+  Fetches the Jinja chat template of a HuggingFace model.
+  If a model has multiple chat templates, you can specify the variant name.
+
+  Syntax:
+    ./scripts/get_chat_template.py model_id [variant]
+
+  Examples:
+    ./scripts/get_chat_template.py NousResearch/Meta-Llama-3-8B-Instruct
+    ./scripts/get_chat_template.py NousResearch/Hermes-3-Llama-3.1-8B tool_use
+    ./scripts/get_chat_template.py meta-llama/Llama-3.2-3B-Instruct
+'''
+
+import json
+import re
+import sys
+
+
+def get_chat_template(model_id, variant=None):
+    try:
+        # Use huggingface_hub library if available.
+        # Allows access to gated models if the user has access and ran `huggingface-cli login`.
+        from huggingface_hub import hf_hub_download
+        with open(hf_hub_download(repo_id=model_id, filename="tokenizer_config.json")) as f:
+            config_str = f.read()
+    except ImportError:
+        import requests
+        assert re.match(r"^[\w.-]+/[\w.-]+$", model_id), f"Invalid model ID: {model_id}"
+        response = requests.get(f"https://huggingface.co/{model_id}/resolve/main/tokenizer_config.json")
+        if response.status_code == 401:
+            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`')
+        response.raise_for_status()
+        config_str = response.text
+
+    try:
+        config = json.loads(config_str)
+    except json.JSONDecodeError:
+        # Fix https://huggingface.co/NousResearch/Meta-Llama-3-8B-Instruct/blob/main/tokenizer_config.json
+        # (Remove extra '}' near the end of the file)
+        config = json.loads(re.sub(r'\}([\n\s]*\}[\n\s]*\],[\n\s]*"clean_up_tokenization_spaces")', r'\1', config_str))
+
+    chat_template = config['chat_template']
+    if isinstance(chat_template, str):
+        return chat_template
+    else:
+        variants = {
+            ct['name']: ct['template']
+            for ct in chat_template
+        }
+
+        def format_variants():
+            return ', '.join(f'"{v}"' for v in variants.keys())
+
+        if variant is None:
+            if 'default' not in variants:
+                raise Exception(f'Please specify a chat template variant (one of {format_variants()})')
+            variant = 'default'
+            sys.stderr.write(f'Note: picked "default" chat template variant (out of {format_variants()})\n')
+        elif variant not in variants:
+            raise Exception(f"Variant {variant} not found in chat template (found {format_variants()})")
+
+        return variants[variant]
+
+
+def main(args):
+    if len(args) < 1:
+        raise ValueError("Please provide a model ID and an optional variant name")
+    model_id = args[0]
+    variant = None if len(args) < 2 else args[1]
+
+    template = get_chat_template(model_id, variant)
+    sys.stdout.write(template)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])