app.py

import gradio as gr
import numpy as np
import matplotlib.pyplot as plt
from GAN.diffusion import build_model, GaussianDiffusion, DiffusionModel
import tensorflow as tf
from tensorflow.python.types.core import TensorLike
import imageio
import tempfile
import os

EPS = 1e-18
class TSFeatureScaler:
    """Global time series scaler that scales all features to [0,1] then normalizes to [-1,1]"""
    
    def __init__(self) -> None:
        self.min_val = None
        self.max_val = None
        
    def fit(self, X: TensorLike) -> "TSFeatureScaler":
        """
        Fit scaler to data
        
        Args:
            X: Input tensor of shape [N, T, D] 
               (N: samples, T: timesteps, D: features)
        """
        # 计算整个数据集的全局最大最小值
        self.min_val = np.min(X)
        self.max_val = np.max(X)
        return self
    
    def transform(self, X: TensorLike) -> TensorLike:
        """
        Transform data in two steps:
        1. Scale to [0,1] using min-max scaling
        2. Normalize to [-1,1]
        """
        if self.min_val is None or self.max_val is None:
            raise ValueError("Scaler must be fitted before transform")
            
        # 1. 缩放到[0,1]
        X_scaled = (X - self.min_val) / (self.max_val - self.min_val + EPS)
        
        # 2. 归一化到[-1,1]
        X_normalized = 2.0 * X_scaled - 1.0
        
        return X_normalized
    
    def fit_transform(self, X: TensorLike) -> TensorLike:
        """Fit to data, then transform it"""
        return self.fit(X).transform(X)
    

def create_animation(frames, fps=1):
    """将帧列表转换为GIF动画数据"""
    import tempfile
    import os
    
    temp_dir = tempfile.gettempdir()
    temp_path = os.path.join(temp_dir, f"temp_{id(frames)}.gif")
    
    # 将fps转换为duration (毫秒)
    duration = int(1000 / fps)  # 1000ms = 1s
    
    # 保存为GIF文件，设置循环播放
    imageio.mimsave(temp_path, frames, format='GIF', duration=duration, loop=0)  # loop=0 表示无限循环
    
    return temp_path

def generate_timeseries(input_file, num_samples=16):
    try:
        # 加载数据
        real_data = np.load(input_file.name)
        scaler = TSFeatureScaler()
        real_data = scaler.fit_transform(real_data)
        print(f"Loaded data shape: {real_data.shape}")
        
        # 确保数据形状正确
        expected_shape = (None, 96, 3)
        if len(real_data.shape) != 3 or real_data.shape[1:] != expected_shape[1:]:
            return None, None
        
        # 创建模型和必要的组件
        network = build_model(
            time_len=96, 
            fea_num=3,
            d_model=16,
            n_heads=2,
            encoder_type='dual'
        )
        ema_network = build_model(
            time_len=96, 
            fea_num=3,
            d_model=16,
            n_heads=2,
            encoder_type='dual'
        )
        ema_network.set_weights(network.get_weights())  
        noise_util = GaussianDiffusion(timesteps=10)
        
        print("Creating model...")
        model = DiffusionModel(
            network=network,
            ema_network=ema_network,
            timesteps=10,
            gdf_util=noise_util,
            data=real_data[:num_samples]
        )
        
        # 加载预训练权重
        checkpoint_path = "/Users/lindan/Dropbox/PhD/Projects/PLF/GAN/code_github/checkpoint/cp.ckpt"
        print(f"Loading weights from {checkpoint_path}")
        model.load_weights(checkpoint_path)

        
        # 生成加噪过程的动画
        print("Generating noising animation...")
        noise_frames = model.plot_noise_process_app(num_samples)
        noise_gif = create_animation(noise_frames)
        
        # 生成去噪过程的动画
        print("Generating denoising animation...")
        denoise_frames = model.plot_denoise_process_app(num_samples)[1:]
        denoise_gif = create_animation(denoise_frames)
        
        return noise_gif, denoise_gif
        
    except Exception as e:
        import traceback
        error_msg = f"Error: {str(e)}\n{traceback.format_exc()}"
        print(error_msg)
        return None, None

def update_example_gifs(num_samples):
    """根据选择的样本数更新示例GIF"""
    return f"noising_example_{num_samples}.gif", f"denoising_example_{num_samples}.gif"

# 创建Gradio界面
with gr.Blocks(title="Wearable Sensors Time-Series Generation") as demo:
    with gr.Column(elem_id="container"):
        # Logo
        gr.Image("logo.webp", elem_id="logo", show_label=False, container=False)
        
        # 标题和副标题
        gr.Markdown(
            """
            # Wearable Sensors Time-Series Generation
            
            <h3 style='font-weight: normal; color: #666;'>-- mainly targeted at livestock wearables sensors data</h3>
            """)
        
    with gr.Row():
        with gr.Column():
            noise_gif = gr.Image(value="noising_example_16.gif", label="Noising Process", show_label=True)
        with gr.Column():
            denoise_gif = gr.Image(value="denoising_example_16.gif", label="Denoising Process", show_label=True)
    
    with gr.Row():
        with gr.Column():

            num_samples = gr.Radio(
                choices=[4, 9, 16, 25],
                value=16,
                label="Number of samples to generate"
            )
            generate_btn = gr.Button("Generate")

            # 将File组件改为Examples组件
            input_file = gr.File(label="Select example data")
            gr.Examples(
                examples=[
                    ["app_examples/example1.npy"],
                    ["app_examples/example2.npy"],
                    ["app_examples/example3.npy"],
                    ["app_examples/example4.npy"]
                ],
                inputs=input_file,
                label="Example Datasets"
            )


    
    # 添加按钮事件处理
    generate_btn.click(
        fn=generate_timeseries,
        inputs=[input_file, num_samples],
        outputs=[noise_gif, denoise_gif]
    )
    
    # 添加样本数选择的事件处理
    num_samples.change(
        fn=update_example_gifs,
        inputs=[num_samples],
        outputs=[noise_gif, denoise_gif]
    )
    
    # 添加CSS样式
    gr.HTML(
        """
        <style>
        #container {
            text-align: center;
            padding: 2rem 0;
        }
        #logo {
            width: 120px;
            height: 120px;
            margin: 0 auto;
            margin-bottom: 1rem;
        }
        h1 {
            font-size: 3.5rem;
            margin-bottom: 0.5rem;
        }
        h3 {
            font-size: 1.8rem;
            margin-top: 0;
            color: #666;
        }
        </style>
        """
    )

# 启动应用
if __name__ == "__main__":
    demo.launch(share=True)