app.py

import gradio as gr
import os
from PIL import Image
import numpy as np
import pickle
import io
import sys
import torch
import subprocess
import h5py
from sklearn.metrics import confusion_matrix
import matplotlib.pyplot as plt

# Paths to the predefined images folder
RAW_PATH = os.path.join("images", "raw")
EMBEDDINGS_PATH = os.path.join("images", "embeddings")

# Specific values for percentage of data for training
percentage_values = [10, 30, 50, 70, 100]

# Custom class to capture print output
class PrintCapture(io.StringIO):
    def __init__(self):
        super().__init__()
        self.output = []

    def write(self, txt):
        self.output.append(txt)
        super().write(txt)

    def get_output(self):
        return ''.join(self.output)

# Function to load and display predefined images based on user selection
def display_predefined_images(percentage_idx):
    percentage = percentage_values[percentage_idx]
    raw_image_path = os.path.join(RAW_PATH, f"percentage_{percentage}_complexity_16.png")  # Assume complexity 16 for simplicity
    embeddings_image_path = os.path.join(EMBEDDINGS_PATH, f"percentage_{percentage}_complexity_16.png")
    
    raw_image = Image.open(raw_image_path)
    embeddings_image = Image.open(embeddings_image_path)
    
    return raw_image, embeddings_image

# Function to create random images for LoS/NLoS classification results
def create_random_image(size=(300, 300)):
    random_image = np.random.rand(*size, 3) * 255
    return Image.fromarray(random_image.astype('uint8'))

# Function to dynamically load a Python module from a given file path
def load_module_from_path(module_name, file_path):
    spec = importlib.util.spec_from_file_location(module_name, file_path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module

# Function to split dataset into training and test sets based on user selection
def split_dataset(channels, labels, percentage_idx):
    percentage = percentage_values[percentage_idx] / 100
    num_samples = channels.shape[0]
    train_size = int(num_samples * percentage)
    indices = np.arange(num_samples)
    np.random.shuffle(indices)
    
    train_idx, test_idx = indices[:train_size], indices[train_size:]
    train_data, test_data = channels[train_idx], channels[test_idx]
    train_labels, test_labels = labels[train_idx], labels[test_idx]
    
    return train_data, test_data, train_labels, test_labels

# Function to generate confusion matrix plot
def plot_confusion_matrix(y_true, y_pred, title):
    cm = confusion_matrix(y_true, y_pred)
    plt.figure(figsize=(4, 4))
    plt.imshow(cm, cmap='Blues')
    plt.title(title)
    plt.xlabel('Predicted')
    plt.ylabel('Actual')
    plt.colorbar()
    plt.xticks([0, 1], labels=[0, 1])
    plt.yticks([0, 1], labels=[0, 1])
    plt.tight_layout()
    plt.savefig(f"{title}.png")
    return Image.open(f"{title}.png")

def identical_train_test_split(output_emb, output_raw, labels, percentage):
    N = output_emb.shape[0]  
    indices = torch.randperm(N)  
    split_index = int(N * percentage)
    train_indices = indices[:split_index]
    test_indices = indices[split_index:]
    train_emb = output_emb[train_indices]
    test_emb = output_emb[test_indices]
    train_raw = output_raw[train_indices]
    test_raw = output_raw[test_indices]
    train_labels = labels[train_indices]
    test_labels = labels[test_indices]

    return train_emb, test_emb, train_raw, test_raw, train_labels, test_labels

# Function to classify test data based on distance to class centroids
def classify_based_on_distance(train_data, train_labels, test_data):
    centroid_0 = train_data[train_labels == 0].mean(dim=0)  
    centroid_1 = train_data[train_labels == 1].mean(dim=0)  
    
    predictions = []
    for test_point in test_data:
        dist_0 = torch.norm(test_point - centroid_0)
        dist_1 = torch.norm(test_point - centroid_1)
        predictions.append(0 if dist_0 < dist_1 else 1)
    
    return torch.tensor(predictions)  

# Store the original working directory when the app starts
original_dir = os.getcwd()

def process_hdf5_file(uploaded_file, percentage_idx):
    capture = PrintCapture()
    sys.stdout = capture  
    
    try:
        model_repo_url = "https://huggingface.co/sadjadalikhani/LWM"
        model_repo_dir = "./LWM"
        if not os.path.exists(model_repo_dir):
            subprocess.run(["git", "clone", model_repo_url, model_repo_dir], check=True)
        repo_work_dir = os.path.join(original_dir, model_repo_dir)
        if os.path.exists(repo_work_dir):
            os.chdir(repo_work_dir)  
        lwm_model_path = os.path.join(os.getcwd(), 'lwm_model.py')
        input_preprocess_path = os.path.join(os.getcwd(), 'input_preprocess.py')
        inference_path = os.path.join(os.getcwd(), 'inference.py')

        lwm_model = load_module_from_path("lwm_model", lwm_model_path)
        input_preprocess = load_module_from_path("input_preprocess", input_preprocess_path)
        inference = load_module_from_path("inference", inference_path)

        device = 'cpu'
        model = lwm_model.LWM.from_pretrained(device=device)

        with h5py.File(uploaded_file.name, 'r') as f:
            channels = np.array(f['channels'])
            labels = np.array(f['labels'])

        preprocessed_chs = input_preprocess.tokenizer(manual_data=channels)
        output_emb = inference.lwm_inference(preprocessed_chs, 'channel_emb', model)
        output_raw = inference.create_raw_dataset(preprocessed_chs, device)

        train_data_emb, test_data_emb, train_data_raw, test_data_raw, train_labels, test_labels = identical_train_test_split(
            output_emb.view(len(output_emb),-1),
            output_raw.view(len(output_raw),-1),
            labels,
            percentage_idx)
        
        pred_raw = classify_based_on_distance(train_data_raw, train_labels, test_data_raw)
        pred_emb = classify_based_on_distance(train_data_emb, train_labels, test_data_emb)

        raw_cm_image = plot_confusion_matrix(test_labels, pred_raw, title="Confusion Matrix (Raw Channels)")
        emb_cm_image = plot_confusion_matrix(test_labels, pred_emb, title="Confusion Matrix (Embeddings)")

        return raw_cm_image, emb_cm_image, capture.get_output()

    except Exception as e:
        return str(e), str(e), capture.get_output()

    finally:
        os.chdir(original_dir)
        sys.stdout = sys.__stdout__  

def los_nlos_classification(file, percentage_idx):
    if file is not None:
        return process_hdf5_file(file, percentage_idx)
    else:
        return display_predefined_images(percentage_idx), None

# Define the Gradio interface with a compact, minimal layout
with gr.Blocks(css="""
    .slider-container {
        text-align: center;
        margin-bottom: 20px;
    }
    .image-row {
        justify-content: center;
        margin-top: 10px;
    }
    .output-box {
        max-width: 600px;
        margin: 0 auto;
    }
""") as demo:
    
    # Contact Section
    gr.Markdown("""
        <div style="text-align: center;">
            <a target="_blank" href="https://www.wi-lab.net">
                <img src="https://www.wi-lab.net/wp-content/uploads/2021/08/WI-name.png" alt="Wireless Model" style="height: 30px;">
            </a>
            <a target="_blank" href="mailto:alikhani@asu.edu" style="margin-left: 10px;">
                <img src="https://img.shields.io/badge/email-alikhani@asu.edu-blue.svg?logo=gmail" alt="Email">
            </a>
        </div>
    """)
    
    # Tabs for Beam Prediction and LoS/NLoS Classification
    with gr.Tab("Beam Prediction Task"):
        gr.Markdown("### Beam Prediction Task")
        with gr.Row():
            with gr.Column(elem_id="slider-container"):
                percentage_slider_bp = gr.Slider(minimum=0, maximum=4, step=1, value=0, label="Training Data (%)")
        with gr.Row(elem_id="image-row"):
            raw_img_bp = gr.Image(label="Raw Channels", type="pil", width=300, height=300)
            embeddings_img_bp = gr.Image(label="Embeddings", type="pil", width=300, height=300)
        percentage_slider_bp.change(fn=display_predefined_images, inputs=[percentage_slider_bp], outputs=[raw_img_bp, embeddings_img_bp])

    with gr.Tab("LoS/NLoS Classification Task"):
        gr.Markdown("### LoS/NLoS Classification Task")
        file_input = gr.File(label="Upload HDF5 Dataset", file_types=[".h5"])
        with gr.Row():
            with gr.Column(elem_id="slider-container"):
                percentage_slider_los = gr.Slider(minimum=0, maximum=4, step=1, value=0, label="Training Data (%)")
        with gr.Row(elem_id="image-row"):
            raw_img_los = gr.Image(label="Raw Channels", type="pil", width=300, height=300)
            embeddings_img_los = gr.Image(label="Embeddings", type="pil", width=300, height=300)
            output_textbox = gr.Textbox(label="Console Output", lines=8, elem_classes="output-box")
        file_input.change(fn=los_nlos_classification, inputs=[file_input, percentage_slider_los], outputs=[raw_img_los, embeddings_img_los, output_textbox])
        percentage_slider_los.change(fn=los_nlos_classification, inputs=[file_input, percentage_slider_los], outputs=[raw_img_los, embeddings_img_los, output_textbox])

# Launch the app
if __name__ == "__main__":
    demo.launch()