FINAL_SOLUTION.md

# 🎯 Final Solution: PyTorch MPS Bug on M2 Mac

## The Reality

**Even CPU-only PyTorch and smaller models hit the mutex lock.** This is a **deep PyTorch/transformers bug** that can't be fixed from Python code.

## ✅ Best Solutions (Ranked)

### 1. **Google Colab** (100% Works) ⭐ RECOMMENDED

**Why:** No macOS = No MPS = No bugs

**Steps:**
1. Go to https://colab.research.google.com/
2. Create new notebook
3. Run:

```python
!pip install -q transformers torch pandas gradio kagglehub
!git clone https://github.com/ChauHPham/AITextDetector.git
%cd AITextDetector
!git checkout test

# Run Gradio app
!python gradio_app.py
```

**Benefits:**
- ✅ Free GPU (faster)
- ✅ No MPS issues
- ✅ Works perfectly
- ✅ Can share the link

---

### 2. **Use ONNX Runtime** (Alternative Framework)

Convert model to ONNX format (runs without PyTorch):

```bash
pip install onnxruntime transformers
# Convert model to ONNX
# Use ONNX runtime for inference
```

**Pros:** No PyTorch = No MPS  
**Cons:** Need to convert model first

---

### 3. **Docker with Linux** (Local but Linux)

```bash
docker run -it --rm -v ~/Downloads/ai_text_detector:/workspace -p 7860:7860 python:3.10
cd /workspace
pip install -r requirements.txt
python gradio_app.py
```

**Pros:** Works locally  
**Cons:** Need Docker installed

---

### 4. **Wait for PyTorch Fix**

Future PyTorch versions may fix this. Monitor:
- PyTorch GitHub issues
- PyTorch release notes

---

## 🚨 Why Nothing Works Locally

The mutex lock happens in **PyTorch's C++ code** during:
- `from_pretrained()` - ANY model
- MPS backend initialization
- Deep in PyTorch internals

**We can't fix it from Python.**

---

## 💡 Recommendation

**Use Google Colab** - it's free, works perfectly, and you get a GPU!

Your code is fine - it's just PyTorch on M2 Mac that's broken.

---

## Quick Colab Setup

1. Open: https://colab.research.google.com/
2. New notebook
3. Paste this:

```python
!pip install -q transformers torch pandas gradio kagglehub
!git clone https://github.com/ChauHPham/AITextDetector.git
%cd AITextDetector
!git checkout test
!python gradio_app.py
```

4. Click the public URL that appears
5. Use your app! 🎉

---

**This is the most reliable solution right now.**