Distil-Home-Assistant-FunctionGemma

A fine-tuned FunctionGemma model (Gemma3 architecture) for multi-turn intent classification and slot extraction in an on-device smart home controller. Trained using knowledge distillation from a 120B teacher model, this model delivers 96.71% tool call accuracy while running locally on-device for private, low-latency smart home control.

For the safetensors version of the Qwen3-based model, see distil-labs/distil-home-assistant-qwen3.

Results

Model	Tool Call Accuracy	ROUGE
GPT-oss-120B (teacher)	92.11%	98.53%
FunctionGemma (base)	38.82%	74.32%
This model (tuned)	96.71%	99.32%

The fine-tuned model exceeds the 120B teacher on tool call accuracy. Fine-tuning is essential for reliable multi-turn smart home conversations.

Quick Start

Using Transformers

import json
from transformers import AutoModelForCausalLM, AutoTokenizer

model = AutoModelForCausalLM.from_pretrained("distil-labs/distil-home-assistant-functiongemma")
tokenizer = AutoTokenizer.from_pretrained("distil-labs/distil-home-assistant-functiongemma")

TOOLS = [
    {"type": "function", "function": {"name": "toggle_lights", "description": "Turn lights on or off in a specified room", "parameters": {"type": "object", "properties": {"room": {"type": "string", "enum": ["living_room", "bedroom", "kitchen", "bathroom", "office", "hallway"]}, "state": {"type": "string", "enum": ["on", "off"]}}, "required": [], "additionalProperties": False}}},
    {"type": "function", "function": {"name": "set_thermostat", "description": "Set the temperature for heating or cooling", "parameters": {"type": "object", "properties": {"temperature": {"type": "integer", "minimum": 60, "maximum": 80}, "mode": {"type": "string", "enum": ["heat", "cool", "auto"]}}, "required": [], "additionalProperties": False}}},
    {"type": "function", "function": {"name": "lock_door", "description": "Lock or unlock a door", "parameters": {"type": "object", "properties": {"door": {"type": "string", "enum": ["front", "back", "garage", "side"]}, "state": {"type": "string", "enum": ["lock", "unlock"]}}, "required": [], "additionalProperties": False}}},
    {"type": "function", "function": {"name": "get_device_status", "description": "Query the current state of a device or room", "parameters": {"type": "object", "properties": {"device_type": {"type": "string", "enum": ["lights", "thermostat", "door", "all"]}, "room": {"type": "string"}}, "required": [], "additionalProperties": False}}},
    {"type": "function", "function": {"name": "set_scene", "description": "Activate a predefined scene", "parameters": {"type": "object", "properties": {"scene": {"type": "string", "enum": ["movie_night", "bedtime", "morning", "away", "party"]}}, "required": [], "additionalProperties": False}}},
    {"type": "function", "function": {"name": "intent_unclear", "description": "Use when the user's intent cannot be determined", "parameters": {"type": "object", "properties": {"reason": {"type": "string", "enum": ["ambiguous", "off_topic", "incomplete", "unsupported_device"]}}, "required": [], "additionalProperties": False}}},
]

messages = [
    {"role": "system", "content": "You are a tool-calling model working on:\n<task_description>You are an on-device smart home controller. Given a natural language command from the user, call the appropriate smart home function. If the user does not specify a required value (e.g. which room or what temperature), omit that parameter from the function call. Maintain context across conversation turns to resolve pronouns and sequential commands.</task_description>\n\nRespond to the conversation history by generating an appropriate tool call that satisfies the user request. Generate only the tool call according to the provided tool schema, do not generate anything else. Always respond with a tool call.\n\n"},
    {"role": "user", "content": "Turn off the living room lights"},
]

text = tokenizer.apply_chat_template(
    messages, tools=TOOLS, tokenize=False, add_generation_prompt=True,
)
inputs = tokenizer(text, return_tensors="pt")
outputs = model.generate(**inputs, max_new_tokens=256, temperature=0)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:], skip_special_tokens=True))
# <tool_call>
# {"name": "toggle_lights", "arguments": {"room": "living_room", "state": "off"}}
# </tool_call>

Using Ollama

huggingface-cli download distil-labs/distil-home-assistant-functiongemma --local-dir distil-model
cd distil-model
ollama create distil-home-assistant-functiongemma -f Modelfile
ollama run distil-home-assistant-functiongemma

Using with the Demo App

This model powers the Smart Home Controller demo — a text-based orchestrator that pairs an SLM with deterministic dialogue management for smart home control.

Model Details

Property	Value
Base Model	FunctionGemma (Gemma3)
Architecture	Gemma3ForCausalLM
Context Length	32,768 tokens
Precision	bfloat16
Training Data	50 seed conversations, synthetically expanded
Teacher Model	GPT-oss-120B
Task	Multi-turn tool calling (closed book)

Training

This model was trained using the Distil Labs platform:

1. Seed Data: 50 hand-written multi-turn conversations covering 6 smart home functions with 2-5 user turns per conversation
2. Synthetic Expansion: Expanded to thousands of examples using a 120B teacher model
3. Fine-tuning: Multi-turn tool calling distillation on FunctionGemma (Gemma3)

What the Model Does

The model acts as a function caller for a smart home controller. Given a user command and conversation history, it outputs a structured tool call:

User: "Turn off the living room lights"
Model: {"name": "toggle_lights", "arguments": {"room": "living_room", "state": "off"}}

User: "The kitchen too"
Model: {"name": "toggle_lights", "arguments": {"room": "kitchen", "state": "off"}}

User: "Lock the front door"
Model: {"name": "lock_door", "arguments": {"door": "front", "state": "lock"}}

User: "Can you order me a pizza?"
Model: {"name": "intent_unclear", "arguments": {"reason": "off_topic"}}

Supported Functions

The model handles 6 smart home operations:

Function	Description
toggle_lights	Turn lights on or off in a room
set_thermostat	Set temperature and heating/cooling mode
lock_door	Lock or unlock a door
get_device_status	Query device state
set_scene	Activate a predefined scene
intent_unclear	Cannot determine intent

Use Cases

• On-device smart home controllers with privacy-first design
• Text-based smart home chatbots with structured intent routing
• Edge deployment for local smart home hubs
• Any multi-turn tool calling task with bounded intent taxonomy

Limitations

• Trained on English smart home intents only
• Covers 6 specific smart home functions — not a general-purpose tool caller
• Temperature range is fixed to 60-80°F

License

This model is released under the Apache 2.0 license.

Links

• Demo App: Smart Home Controller
• Distil Labs Website
• GitHub
• Hugging Face

Citation

@misc{distil-home-assistant-functiongemma,
  author = {Distil Labs},
  title = {Distil-Home-Assistant-FunctionGemma: A Fine-tuned SLM for Smart Home Control},
  year = {2025},
  publisher = {Hugging Face},
  url = {https://huggingface.co/distil-labs/distil-home-assistant-functiongemma}
}