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Model: litert-community/FunctionGemma_270M_Mobile_Actions Source: Original Platform
2026-06-15 23:17:13 +08:00
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+---
+base_model: google/functiongemma-270m-it
+tags:
+- function-calling
+- mobile-actions
+- gemma
+library_name: transformers
+datasets:
+- google/mobile-actions
+language:
+- en
+license: gemma
+---
+
+# FunctionGemma 270M for Mobile Actions
+
+This model is a fine-tuned version of [google/functiongemma-270m-it](https://huggingface.co/google/functiongemma-270m-it) specialized for mobile assistant actions. It has been trained on the [google/mobile-actions](https://huggingface.co/datasets/google/mobile-actions) dataset to perform structured function calling for common mobile device tasks.
+
+## Model Description
+
+**Base Model**: `google/functiongemma-270m-it` - A 270M parameter instruction-tuned model from Google's FunctionGemma family, designed for function calling tasks.
+
+**Specialization**: Mobile assistant actions including:
+- Calendar event management
+- Email composition and sending
+- Contact creation
+- Flashlight control
+- Wi-Fi settings navigation  
+- Map location display
+
+**Training Objective**: The model learns to emit structured function calls in the format `call:<function_name>{arg1:value1,arg2:value2,...}` instead of natural language responses.
+
+## Supported Functions
+
+The model is optimized to call these mobile action functions:
+
+1. **`turn_on_flashlight()`** - Turns the device flashlight on
+2. **`turn_off_flashlight()`** - Turns the device flashlight off
+3. **`create_contact(first_name, last_name, phone_number?, email?)`** - Creates a new contact
+4. **`send_email(to, subject, body?)`** - Sends an email to a recipient
+5. **`show_map(query)`** - Displays a location on the map by name, business, or address
+6. **`open_wifi_settings()`** - Opens the Wi-Fi settings screen
+7. **`create_calendar_event(title, datetime)`** - Creates a calendar event (datetime in ISO format: `YYYY-MM-DDTHH:MM:SS`)
+
+## Training Details
+
+### Training Data
+
+- **Dataset**: [google/mobile-actions](https://huggingface.co/datasets/google/mobile-actions)
+- **Format**: JSONL with prompt-completion pairs
+- **Splits**: 
+  - Training set: examples with `"metadata": "train"`
+  - Evaluation set: examples with `"metadata": "eval"`
+- **Preprocessing**: Converted to TRL prompt-completion format with `completion_only_loss=True`
+
+### Training Procedure
+
+Fine-tuned using Hugging Face [TRL (Transformer Reinforcement Learning)](https://huggingface.co/docs/trl) with the `SFTTrainer`.
+
+**Training Configuration**:
+- **Epochs**: 4
+- **Batch size**: 8 per device
+- **Gradient accumulation steps**: 4
+- **Learning rate**: 5e-5
+- **Scheduler**: Cosine
+- **Max sequence length**: 997 tokens (based on longest example: 897 tokens)
+- **Optimizer**: AdamW (fused)
+- **Precision**: bfloat16
+- **Gradient checkpointing**: Enabled
+- **Completion only loss**: True (trains only on model outputs, not prompts)
+
+**Training Infrastructure**:
+- **Hardware**: Google Colab A100 GPU
+- **Training time**: ~20 minutes for 2 epochs
+- **Library versions**: transformers==4.57.1, trl==0.25.1, datasets==4.4.1
+
+### Training Results
+
+Final metrics after 2 epochs:
+
+| Step | Training Loss | Validation Loss | Mean Token Accuracy |
+|------|---------------|-----------------|---------------------|
+| 500  | 0.008800      | 0.013452        | 0.996691           |
+
+The model achieved 99.67% token-level accuracy on the validation set, showing significant improvement over the base model's mobile action capabilities.
+
+## Intended Use
+
+This model is designed for:
+- **Mobile AI assistants** that need to execute device actions based on user requests
+- **Voice-controlled mobile applications** 
+- **Conversational agents** that interact with mobile device features
+- **On-device AI** applications (can be converted to `.litertlm` format for deployment)
+
+## How to Use
+
+### Basic Inference
+
+```python
+from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline
+import json
+
+# Load model and tokenizer
+model_id = "jprtr/google_mobile_actions"
+tokenizer = AutoTokenizer.from_pretrained(model_id)
+model = AutoModelForCausalLM.from_pretrained(
+    model_id,
+    device_map="auto",
+    attn_implementation="eager",
+    torch_dtype="auto",
+)
+
+# Create pipeline
+pipe = pipeline("text-generation", model=model, tokenizer=tokenizer)
+
+# Define the tools (function schemas)
+tools = [
+    {
+        "function": {
+            "name": "create_calendar_event",
+            "description": "Creates a new calendar event.",
+            "parameters": {
+                "type": "OBJECT",
+                "properties": {
+                    "title": {"type": "STRING", "description": "The title of the event."},
+                    "datetime": {"type": "STRING", "description": "The date and time in YYYY-MM-DDTHH:MM:SS format."},
+                },
+                "required": ["title", "datetime"],
+            },
+        }
+    },
+    {
+        "function": {
+            "name": "send_email",
+            "description": "Sends an email.",
+            "parameters": {
+                "type": "OBJECT",
+                "properties": {
+                    "to": {"type": "STRING", "description": "The recipient email address."},
+                    "subject": {"type": "STRING", "description": "The email subject."},
+                    "body": {"type": "STRING", "description": "The email body."},
+                },
+                "required": ["to", "subject"],
+            },
+        }
+    },
+    # ... add other function definitions
+]
+
+# Create messages
+messages = [
+    {
+        "role": "developer",
+        "content": (
+            "Current date and time given in YYYY-MM-DDTHH:MM:SS format: 2025-07-10T19:06:29\n"
+            "Day of week is Thursday\n"
+            "You are a model that can do function calling with the following functions\n"
+        ),
+    },
+    {
+        "role": "user",
+        "content": 'Schedule a "team meeting" tomorrow at 4pm.',
+    },
+]
+
+# Apply chat template
+prompt = tokenizer.apply_chat_template(
+    messages,
+    tools=tools,
+    tokenize=False,
+    add_generation_prompt=True,
+)
+
+# Generate
+output = pipe(prompt, max_new_tokens=200)[0]["generated_text"][len(prompt):].strip()
+print("Model output:", output)
+# Example output: call:create_calendar_event{datetime:2025-07-11T16:00:00,title:team meeting}
+```
+
+### Parsing Function Calls
+
+The model outputs function calls in a simple format:
+```
+call:<function_name>{arg1:value1,arg2:value2,...}
+```
+
+For multiple function calls, they appear sequentially:
+```
+call:create_calendar_event{datetime:2025-07-15T10:30:00,title:Dental Checkup}
+call:send_email{to:user@example.com,subject:Appointment,body:See you there!}
+```
+
+You can parse these by:
+1. Splitting on `call:` to identify individual function calls
+2. Extracting the function name (text before `{`)
+3. Parsing the arguments block (content within `{}`)
+
+## Evaluation
+
+The model was evaluated on the held-out test set from the mobile-actions dataset. Evaluation metrics compare exact string matching of the model's function call outputs against ground truth labels.
+
+**Key Observations**:
+- The base FunctionGemma 270M model often fails to call appropriate functions for mobile actions
+- After fine-tuning, the model reliably generates correct function calls with proper argument formatting
+- Token-level accuracy on the validation set: **99.67%**
+
+## Limitations
+
+- The model is specialized for the 7 mobile action functions listed above and may not generalize well to other function calling tasks
+- Date/time parsing relies on context provided in the developer message (current date/time must be specified)
+- The model outputs may occasionally include variations in argument formatting that are semantically correct but don't exactly match the expected format
+- This is a 270M parameter model, so while efficient for mobile deployment, it may have lower accuracy than larger models
+
+## On-Device Deployment
+
+The model can be converted to `.litertlm` format for on-device deployment using `ai-edge-torch`. See the [training notebook](https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/FunctionGemma/%5BFunctionGemma%5DFinetune_FunctionGemma_270M_for_Mobile_Actions_with_Hugging_Face.ipynb) for conversion instructions.
+
+The converted model can be deployed on:
+- Android devices via [Google AI Edge](https://ai.google.dev/edge)
+- [AI Edge Gallery app](https://play.google.com/store/apps/details?id=com.google.ai.edge.gallery)
+
+## Training Notebook
+
+For full training details, hyperparameter tuning, and evaluation, see the original Colab notebook:
+[Finetune FunctionGemma 270M for Mobile Actions](https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/FunctionGemma/%5BFunctionGemma%5DFinetune_FunctionGemma_270M_for_Mobile_Actions_with_Hugging_Face.ipynb)
+
+## Citation
+
+If you use this model, please cite the original FunctionGemma paper and the Google Mobile Actions dataset:
+
+```bibtex
+@misc{functiongemma2024,
+  title={FunctionGemma: Function Calling for Gemma Models},
+  author={Google},
+  year={2024},
+  url={https://huggingface.co/google/functiongemma-270m-it}
+}
+```
+
+## License
+
+This model is released under the Gemma license. See the [Gemma Terms of Use](https://ai.google.dev/gemma/terms) for details.