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---
license: cc-by-nc-4.0
datasets:
- Salesforce/xlam-function-calling-60k
- MadeAgents/xlam-irrelevance-7.5k
base_model:
- Qwen/Qwen2.5-Coder-1.5B-Instruct
---
# Hammer2.1-1.5b Function Calling Model
**<span style="color: red;">New Update (June 2025):</span>** We are excited to announce that our model has been integrated into Google AI Edge! This integration allows for seamless on-device inference, enabling users to experience the power of our model directly on their mobile devices. For more details, please visit [Google AI Edge](https://ai.google.dev/edge/mediapipe/solutions/genai/function_calling/android).
## Introduction
Hammer refers to a series of lightweight Large Action Models. Currently, we are releasing Hammer 2.1 models ([0.5B](https://huggingface.co/MadeAgents/Hammer2.1-0.5b), [1.5B](https://huggingface.co/MadeAgents/Hammer2.1-1.5b), [3B](https://huggingface.co/MadeAgents/Hammer2.1-3b), and [7B](https://huggingface.co/MadeAgents/Hammer2.1-7b)) with strong function calling capability. These models are based on the Qwen 2.5 coder series and utilize [function masking techniques](https://arxiv.org/abs/2410.04587) and other advanced technologies. Hammer 2.1 series bring significant enhancements, while still maintaining the basic functionality of Hammer 2.0's Single-Turn interaction and further strengthening other capabilities.
## Model Details
The Hammer 2.1 models, fine-tuned from the Qwen 2.5 coder series, inherit Hammer 2.0's advantages and are enhanced as follows:
- <span style="color: red;">Multi-Step Function Calling:</span> The assistant can perform multiple internal function calls to handle a single user request, actively planning and gathering information to fulfill complex tasks.
- <span style="color: red;">Multi-Turn Function Calling:</span> Enables continuous and context-aware interactions over multiple exchanges, with each turn potentially containing multiple steps, for a more natural conversation experience.
- Enhanced Irrelevant Information Inspection: Better at identifying when provided functions are irrelevant to a user query, by providing a non-function call response.
## Evaluation
The evaluation results of Hammer 2.1 models on the Berkeley Function-Calling Leaderboard (BFCL-v3) are presented in the following table:
<div style="text-align: center;">
<img src="v2_figures/bfcl.png" alt="overview" width="1000" style="margin: auto;">
</div>
Our Hammer 2.1 series consistently achieves corresponding best performance at comparable scales. The 7B/3B/1.5B model outperform most function calling enchanced models.
In addition, we evaluated the Hammer 2.1 models on other academic benchmarks to further demonstrate the generalization ability of our models.
<div style="text-align: center;">
<img src="v2_figures/others-v2.png" alt="overview" width="1000" style="margin: auto;">
</div>
Hammer 2.1 models showcase highly stable performance, suggesting the robustness of Hammer 2.1 series. In contrast, the baseline approaches display varying levels of effectiveness.
## Requiements
The code of Hammer 2.1 models have been in the latest Hugging face transformers and we advise you to install `transformers>=4.47.0`.
## How to Use
Hammer models offer flexibility in deployment and usage, fully supporting both **vLLM** deployment and **Hugging Face Transformers** tool calling. Below are the specifics on how to make use of these features:
### Using vLLM
#### Option 1: Using Hammer client (Recommended)
Before using vLLM, first clone the Hammer code repository and change directory to the 'Hammer':
```
git clone https://github.com/MadeAgents/Hammer.git
cd Hammer
```
vLLM offers efficient serving with lower latency. To serve the model with vLLM:
```
vllm serve MadeAgents/Hammer2.1-1.5b --host 0.0.0.0 --port 8000 --tensor-parallel-size 1
```
Once the model is served, you can use the following Hammer client to interact with it for function calling:
~~~
from client import HammerChatCompletion,HammerConfig
config = HammerConfig(base_url="http://localhost:8000/v1/", model="MadeAgents/Hammer2.1-1.5b")
llm = HammerChatCompletion.from_config(config)
# Example conversation
messages = [
{"role": "user", "content": "What's the weather like in New York?"},
{"role": "assistant","content": '```\n{"name": "get_weather", "arguments": {"location": "New York, NY ", "unit": "celsius"}\n```'},
{"role": "tool", "name": "get_weather", "content": '{"temperature": 72, "description": "Partly cloudy"}'},
{"role": "user", "content": "Now, search for the weather in San Francisco."}
]
# Example function definition (optional)
tools = [
{
"name": "get_weather",
"description": "Get the current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "The city and state, e.g. San Francisco, CA"},
"unit": {"type": "string", "enum": ["celsius", "fahrenheit"], "description": "The unit of temperature to return"}
},
"required": ["location"]
}
},
{
"name": "respond",
"description": "When you are ready to respond, use this function. This function allows the assistant to formulate and deliver appropriate replies based on the input message and the context of the conversation. Generate a concise response for simple questions, and a more detailed response for complex questions.",
"parameters": {
"type": "object",
"properties": {
"message": {"type": "string", "description": "The content of the message to respond to."}
},
"required": ["message"]
}
}
]
response = llm.completion(messages, tools=tools)
print(response)
~~~
#### Option 2: Using vLLMs built-in tool calling
Hammer2.1 supports vllms built-in tool calling. This functionality requires vllm>=0.6. If you want to enable this functionality, please start vllms OpenAI-compatible service with:
~~~
vllm serve MadeAgents/Hammer2.1-1.5b --enable-auto-tool-choice --tool-call-parser hermes
~~~
And then use it in the same way you use GPTs tool calling:
~~~
tools = [
{
"type": "function",
"function": {
"name": "get_current_weather",
"description": "Get the current weather",
"parameters": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "The city and state, e.g. San Francisco, CA",
},
"format": {
"type": "string",
"enum": ["celsius", "fahrenheit"],
"description": "The temperature unit to use. Infer this from the users location.",
"default": "celsius"
},
},
"required": ["location","format"],
},
}
},
{
"type": "function",
"function": {
"name": "get_n_day_weather_forecast",
"description": "Get an N-day weather forecast",
"parameters": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "The city and state, e.g. San Francisco, CA",
},
"format": {
"type": "string",
"enum": ["celsius", "fahrenheit"],
"description": "The temperature unit to use. Infer this from the users location.",
"default": "celsius"
},
"num_days": {
"type": "integer",
"description": "The number of days to forecast",
"default": 1
}
},
"required": ["location", "format", "num_days"]
},
}
},
]
from openai import OpenAI
openai_api_key = "None"
openai_api_base = "http://localhost:8000/v1"
client = OpenAI(
api_key=openai_api_key,
base_url=openai_api_base,
)
query = """What's the weather like today in San Francisco"""
chat_response = client.chat.completions.create(
model="MadeAgents/Hammer2.1-1.5b",
messages=[
{"role": "user", "content": query},],
tools = tools,
temperature=0
)
print(chat_response.choices[0].message.content)
~~~
### Using Hugging Face Transformers
Hammer2.1s chat template also includes a tool calling template, meaning that you can use Hugging Face transformers tool calling support. This is a simple example of how to use our model using Transformers.
~~~
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("MadeAgents/Hammer2.1-1.5b")
model = AutoModelForCausalLM.from_pretrained("MadeAgents/Hammer2.1-1.5b", torch_dtype=torch.bfloat16, device_map="auto")
# Example conversation
messages = [
{"role": "user", "content": "What's the weather like in New York?"},
{"role": "assistant","content": '```\n{"name": "get_weather", "arguments": {"location": "New York, NY ", "unit": "celsius"}\n```'},
{"role": "tool", "name": "get_weather", "content": '{"temperature": 72, "description": "Partly cloudy"}'},
{"role": "user", "content": "Now, search for the weather in San Francisco."}
]
# Example function definition (optional)
tools = [
{
"name": "get_weather",
"description": "Get the current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "The city and state, e.g. San Francisco, CA"},
"unit": {"type": "string", "enum": ["celsius", "fahrenheit"], "description": "The unit of temperature to return"}
},
"required": ["location"]
}
},
{
"name": "respond",
"description": "When you are ready to respond, use this function. This function allows the assistant to formulate and deliver appropriate replies based on the input message and the context of the conversation. Generate a concise response for simple questions, and a more detailed response for complex questions.",
"parameters": {
"type": "object",
"properties": {
"message": {"type": "string", "description": "The content of the message to respond to."}
},
"required": ["message"]
}
}
]
inputs = tokenizer.apply_chat_template(messages, tools=tools, add_generation_prompt=True, return_dict=True, return_tensors="pt")
inputs = {k: v.to(model.device) for k, v in inputs.items()}
out = model.generate(**inputs, max_new_tokens=128)
print(tokenizer.decode(out[0][len(inputs["input_ids"][0]):], skip_special_tokens=True))
~~~

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"chat_template": "{%- set system_message = 'You are a helpful assistant.' %}\n{%- if messages[0]['role'] == 'system' %}\n {%- set system_message = messages[0]['content'] %}\n {%- if messages[1]['role'] == 'system' %}\n {%- set format_message = messages[1]['content'] %}\n {%- set loop_messages = messages[2:] %}\n {%- else %}\n {%- set loop_messages = messages[1:] %}\n {%- endif %}\n{%- else %}\n {%- set loop_messages = messages %}\n{%- endif %}\n{%- if not tools is defined %}\n {%- set tools = none %}\n{%- endif %}\n{%- if system_message is defined %}\n{{- '<|im_start|>system\n' + system_message + '<|im_end|>\n' }}\n{%- endif %}\n\n\n{%- if tools is not none %}\n{% set task_instruction %}You are a tool calling assistant. In order to complete the user's request, you need to select one or more appropriate tools from the following tools and fill in the correct values for the tool parameters. Your specific tasks are:\n1. Make one or more function/tool calls to meet the request based on the question.\n2. If none of the function can be used, point it out and refuse to answer.\n3. If the given question lacks the parameters required by the function, also point it out.\n\nThe following are characters that may interact with you\n1. user: Provides query or additional information.\n2. tool: Returns the results of the tool calling.\n{% endset %}\n\n{% set format_instruction %}\nThe output MUST strictly adhere to the following JSON format, and NO other text MUST be included.\nThe example format is as follows. Please make sure the parameter type is correct. If no function call is needed, please directly output an empty list '[]'\n```\n[\n {\"name\": \"func_name1\", \"arguments\": {\"argument1\": \"value1\", \"argument2\": \"value2\"}},\n ... (more tool calls as required)\n]\n```\n{% endset %}\n{{- '<|im_start|>user\n[BEGIN OF TASK INSTRUCTION]\n' + task_instruction + '\n[END OF TASK INSTRUCTION]\n\n'}}\n {{- '[BEGIN OF AVAILABLE_TOOLS]\n' }}\n {{- tools|string }}\n {{- '\n[END OF AVAILABLE_TOOLS]\n\n' }}\n {{- '\n[BEGIN OF TASK INSTRUCTION]\n' + format_instruction + '\n[END OF TASK INSTRUCTION]\n\n<|im_end|>\n' }}\n{%- endif %}\n\n{%- for message in loop_messages %}\n {%- set role = message['role'] %}\n {%- set content = message['content'] %}\n {{- '<|im_start|>'+ role +'\n' + content + '<|im_end|>\n'}}\n{%- endfor %}\n{{- '<|im_start|>assistant\n' }}",
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