app.py

import os
import sys
import torch
import numpy as np
import gradio as gr
import torchaudio
import torchvision

# Import Gradio Spaces GPU decorator
try:
    from gradio import spaces
    HAS_SPACES = True
    print("\033[92mINFO\033[0m: Gradio Spaces detected, GPU acceleration will be enabled")
except ImportError:
    HAS_SPACES = False
    print("\033[93mWARN\033[0m: gradio.spaces not available, running without GPU optimization")

# Add parent directory to path to import preprocess functions
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# Import functions from infer_watermelon.py and train_watermelon for the model
from train_watermelon import WatermelonModel

# Modified version of process_audio_data specifically for the app to handle various tensor shapes
def app_process_audio_data(waveform, sample_rate):
    """Modified version of process_audio_data for the app that handles different tensor dimensions"""
    try:
        print(f"\033[92mDEBUG\033[0m: Processing audio - Initial shape: {waveform.shape}, Sample rate: {sample_rate}")
        
        # Handle different tensor dimensions
        if waveform.dim() == 3:
            print(f"\033[92mDEBUG\033[0m: Found 3D tensor, converting to 2D")
            # For 3D tensor, take the first item (batch dimension)
            waveform = waveform[0]
            
        if waveform.dim() == 2:
            # Use the first channel for stereo audio
            waveform = waveform[0]
            print(f"\033[92mDEBUG\033[0m: Using first channel, new shape: {waveform.shape}")
        
        # Resample to 16kHz if needed
        resample_rate = 16000
        if sample_rate != resample_rate:
            print(f"\033[92mDEBUG\033[0m: Resampling from {sample_rate}Hz to {resample_rate}Hz")
            waveform = torchaudio.transforms.Resample(orig_freq=sample_rate, new_freq=resample_rate)(waveform)
        
        # Ensure 3 seconds of audio
        if waveform.size(0) < 3 * resample_rate:
            print(f"\033[92mDEBUG\033[0m: Padding audio from {waveform.size(0)} to {3 * resample_rate} samples")
            waveform = torch.nn.functional.pad(waveform, (0, 3 * resample_rate - waveform.size(0)))
        else:
            print(f"\033[92mDEBUG\033[0m: Trimming audio from {waveform.size(0)} to {3 * resample_rate} samples")
            waveform = waveform[: 3 * resample_rate]
        
        # Apply MFCC transformation
        print(f"\033[92mDEBUG\033[0m: Applying MFCC transformation")
        mfcc_transform = torchaudio.transforms.MFCC(
            sample_rate=resample_rate,
            n_mfcc=13,
            melkwargs={
                "n_fft": 256,
                "win_length": 256,
                "hop_length": 128,
                "n_mels": 40,
            }
        )
        
        mfcc = mfcc_transform(waveform)
        print(f"\033[92mDEBUG\033[0m: MFCC output shape: {mfcc.shape}")
        
        return mfcc
    except Exception as e:
        import traceback
        print(f"\033[91mERR!\033[0m: Error in audio processing: {e}")
        print(traceback.format_exc())
        return None

# Similarly for images, but let's import the original one
from preprocess import process_image_data

# Define prediction function
def predict_sweetness(audio, image, model_path):
    """Predict sweetness of a watermelon from audio and image input"""
    try:
        # Now check CUDA availability inside the GPU-decorated function
        if torch.cuda.is_available():
            device = torch.device("cuda")
            print(f"\033[92mINFO\033[0m: CUDA is available. Using device: {device}")
        else:
            device = torch.device("cpu")
            print(f"\033[92mINFO\033[0m: CUDA is not available. Using device: {device}")
        
        # Load model inside the function to ensure it's on the correct device
        model = WatermelonModel().to(device)
        model.load_state_dict(torch.load(model_path, map_location=device))
        model.eval()
        print(f"\033[92mINFO\033[0m: Loaded model from {model_path}")
        
        # Debug information about input types
        print(f"\033[92mDEBUG\033[0m: Audio input type: {type(audio)}")
        print(f"\033[92mDEBUG\033[0m: Audio input shape/length: {len(audio)}")
        print(f"\033[92mDEBUG\033[0m: Image input type: {type(image)}")
        if isinstance(image, np.ndarray):
            print(f"\033[92mDEBUG\033[0m: Image input shape: {image.shape}")
        
        # Handle different audio input formats
        if isinstance(audio, tuple) and len(audio) == 2:
            # Standard Gradio format: (sample_rate, audio_data)
            sample_rate, audio_data = audio
            print(f"\033[92mDEBUG\033[0m: Audio sample rate: {sample_rate}")
            print(f"\033[92mDEBUG\033[0m: Audio data shape: {audio_data.shape}")
        elif isinstance(audio, tuple) and len(audio) > 2:
            # Sometimes Gradio returns (sample_rate, audio_data, other_info...)
            sample_rate, audio_data = audio[0], audio[-1]
            print(f"\033[92mDEBUG\033[0m: Audio sample rate: {sample_rate}")
            print(f"\033[92mDEBUG\033[0m: Audio data shape: {audio_data.shape}")
        elif isinstance(audio, str):
            # Direct path to audio file
            audio_data, sample_rate = torchaudio.load(audio)
            print(f"\033[92mDEBUG\033[0m: Loaded audio from path with shape: {audio_data.shape}")
        else:
            return f"Error: Unsupported audio format. Got {type(audio)}"
        
        # Create a temporary file path for the audio and image
        temp_dir = "temp"
        os.makedirs(temp_dir, exist_ok=True)
        
        temp_audio_path = os.path.join(temp_dir, "temp_audio.wav")
        temp_image_path = os.path.join(temp_dir, "temp_image.jpg")
        
        # Import necessary libraries
        from PIL import Image
        
        # Audio handling - direct processing from the data in memory
        if isinstance(audio_data, np.ndarray):
            # Convert numpy array to tensor
            print(f"\033[92mDEBUG\033[0m: Converting numpy audio with shape {audio_data.shape} to tensor")
            audio_tensor = torch.tensor(audio_data).float()
            
            # Handle different audio dimensions
            if audio_data.ndim == 1:
                # Single channel audio
                audio_tensor = audio_tensor.unsqueeze(0)
            elif audio_data.ndim == 2:
                # Ensure channels are first dimension
                if audio_data.shape[0] > audio_data.shape[1]:
                    # More rows than columns, probably (samples, channels)
                    audio_tensor = torch.tensor(audio_data.T).float()
        else:
            # Already a tensor
            audio_tensor = audio_data.float()
        
        print(f"\033[92mDEBUG\033[0m: Audio tensor shape before processing: {audio_tensor.shape}")
        
        # Skip saving/loading and process directly
        mfcc = app_process_audio_data(audio_tensor, sample_rate)
        print(f"\033[92mDEBUG\033[0m: MFCC tensor shape after processing: {mfcc.shape if mfcc is not None else None}")
        
        # Image handling
        if isinstance(image, np.ndarray):
            print(f"\033[92mDEBUG\033[0m: Converting numpy image with shape {image.shape} to PIL")
            pil_image = Image.fromarray(image)
            pil_image.save(temp_image_path)
            print(f"\033[92mDEBUG\033[0m: Saved image to {temp_image_path}")
        elif isinstance(image, str):
            # If image is already a path
            temp_image_path = image
            print(f"\033[92mDEBUG\033[0m: Using provided image path: {temp_image_path}")
        else:
            return f"Error: Unsupported image format. Got {type(image)}"
        
        # Process image
        print(f"\033[92mDEBUG\033[0m: Loading and preprocessing image from {temp_image_path}")
        image_tensor = torchvision.io.read_image(temp_image_path)
        print(f"\033[92mDEBUG\033[0m: Loaded image shape: {image_tensor.shape}")
        image_tensor = image_tensor.float()
        processed_image = process_image_data(image_tensor)
        print(f"\033[92mDEBUG\033[0m: Processed image shape: {processed_image.shape if processed_image is not None else None}")
        
        # Add batch dimension for inference and move to device
        if mfcc is not None:
            mfcc = mfcc.unsqueeze(0).to(device)
            print(f"\033[92mDEBUG\033[0m: Final MFCC shape with batch dimension: {mfcc.shape}")
        
        if processed_image is not None:
            processed_image = processed_image.unsqueeze(0).to(device)
            print(f"\033[92mDEBUG\033[0m: Final image shape with batch dimension: {processed_image.shape}")
        
        # Run inference
        print(f"\033[92mDEBUG\033[0m: Running inference on device: {device}")
        if mfcc is not None and processed_image is not None:
            with torch.no_grad():
                sweetness = model(mfcc, processed_image)
                print(f"\033[92mDEBUG\033[0m: Prediction successful: {sweetness.item()}")
        else:
            return "Error: Failed to process inputs. Please check the debug logs."
        
        # Format the result
        if sweetness is not None:
            result = f"Predicted Sweetness: {sweetness.item():.2f}/13"
            
            # Add a qualitative description
            if sweetness.item() < 9:
                result += "\n\nThis watermelon is not very sweet. You might want to choose another one."
            elif sweetness.item() < 10:
                result += "\n\nThis watermelon has moderate sweetness."
            elif sweetness.item() < 11:
                result += "\n\nThis watermelon is sweet! A good choice."
            else:
                result += "\n\nThis watermelon is very sweet! Excellent choice!"
                
            return result
        else:
            return "Error: Could not predict sweetness. Please try again with different inputs."
    
    except Exception as e:
        import traceback
        error_msg = f"Error: {str(e)}\n\n"
        error_msg += traceback.format_exc()
        print(f"\033[91mERR!\033[0m: {error_msg}")
        return error_msg

# Apply GPU decorator if available in Gradio Spaces environment
if HAS_SPACES:
    predict_sweetness_gpu = spaces.GPU(predict_sweetness)
    print("\033[92mINFO\033[0m: GPU optimization enabled for prediction function")
else:
    predict_sweetness_gpu = predict_sweetness

def create_app(model_path):
    """Create and launch the Gradio interface"""
    # Define the prediction function with model path
    def predict_fn(audio, image):
        if HAS_SPACES:
            # Use GPU-optimized function if available
            return predict_sweetness_gpu(audio, image, model_path)
        else:
            # Use regular function otherwise
            return predict_sweetness(audio, image, model_path)
    
    # Create Gradio interface
    with gr.Blocks(title="Watermelon Sweetness Predictor", theme=gr.themes.Soft()) as interface:
        gr.Markdown("# 🍉 Watermelon Sweetness Predictor")
        gr.Markdown("""
        This app predicts the sweetness of a watermelon based on its sound and appearance.
        
        ## Instructions:
        1. Upload or record an audio of tapping the watermelon
        2. Upload or capture an image of the watermelon
        3. Click 'Predict' to get the sweetness estimation
        """)
        
        with gr.Row():
            with gr.Column():
                audio_input = gr.Audio(label="Upload or Record Audio", type="numpy")
                image_input = gr.Image(label="Upload or Capture Image")
                submit_btn = gr.Button("Predict Sweetness", variant="primary")
            
            with gr.Column():
                output = gr.Textbox(label="Prediction Results", lines=6)
                
        submit_btn.click(
            fn=predict_fn,
            inputs=[audio_input, image_input],
            outputs=output
        )
        
        gr.Markdown("""
        ## How it works
        
        The app uses a deep learning model that combines:
        - Audio analysis using MFCC features and LSTM neural network
        - Image analysis using ResNet-50 convolutional neural network
        
        The model was trained on a dataset of watermelons with known sweetness values.
        
        ## Tips for best results
        - For audio: Tap the watermelon with your knuckle and record the sound
        - For image: Take a clear photo of the whole watermelon in good lighting
        """)
    
    return interface

if __name__ == "__main__":
    import argparse
    
    parser = argparse.ArgumentParser(description="Watermelon Sweetness Prediction App")
    parser.add_argument(
        "--model_path", 
        type=str, 
        default="models/watermelon_model_final.pt", 
        help="Path to the trained model file"
    )
    parser.add_argument(
        "--share", 
        action="store_true", 
        help="Create a shareable link for the app"
    )
    parser.add_argument(
        "--debug", 
        action="store_true", 
        help="Enable verbose debug output"
    )
    
    args = parser.parse_args()
    
    if args.debug:
        print(f"\033[92mINFO\033[0m: Debug mode enabled")
    
    # Check if model exists
    if not os.path.exists(args.model_path):
        print(f"\033[91mERR!\033[0m: Model not found at {args.model_path}")
        print("\033[92mINFO\033[0m: Please train a model first or provide a valid model path")
        sys.exit(1)
    
    # Create and launch the app
    app = create_app(args.model_path)
    app.launch(share=args.share)