app.py

import gradio as gr
import torch
from transformers import CvtForImageClassification, AutoFeatureExtractor
from PIL import Image
import os

# Configuración del dispositivo
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

# Cargar el extractor de características de Hugging Face
extractor = AutoFeatureExtractor.from_pretrained("microsoft/cvt-13")

# Definir las clases en el mismo orden que el modelo las predice
class_names = [
    "glioma_tumor",
    "meningioma_tumor",
    "no_tumor",
    "pituitary_tumor"
]

# Función para cargar el modelo (solo una vez)
def load_model():
    model_dir = "models"  # Ruta a los pesos
    model_file_pytorch = "cvt_model.pth"
    
    # Cargar los pesos del modelo desde el archivo .pth
    checkpoint = torch.load(os.path.join(model_dir, model_file_pytorch), map_location=device)
    
    # Cargar el modelo dependiendo de si tenemos el modelo completo o solo los pesos
    if isinstance(checkpoint, CvtForImageClassification):
        model_pytorch = checkpoint  # El checkpoint ya es un modelo completo
    else:
        model_pytorch = CvtForImageClassification.from_pretrained("microsoft/cvt-13")
        model_pytorch.load_state_dict(checkpoint)  # Cargar los pesos en el modelo
    
    model_pytorch.to(device)
    model_pytorch.eval()
    return model_pytorch

# Cargar el modelo una vez cuando la app se inicie
model_pytorch = load_model()

# Función para hacer predicción con la imagen cargada
def predict_image(image):
    # Preprocesar la imagen usando el extractor de características
    inputs = extractor(images=image, return_tensors="pt").to(device)
    
    # Hacer la predicción con el modelo
    with torch.no_grad():
        outputs = model_pytorch(**inputs)
    
    # Obtener los logits de la salida
    logits = outputs.logits
    
    # Convertir los logits en probabilidades
    probabilities = torch.nn.functional.softmax(logits, dim=-1)
    
    # Obtener la clase predicha (índice con mayor probabilidad)
    predicted_index = probabilities.argmax(dim=-1).item()

    # Mapear el índice de la clase predicha al nombre de la clase
    predicted_class = class_names[predicted_index]

    # Retornar el nombre de la clase predicha
    return predicted_class
# Función para limpiar los inputs
def clear_inputs():
    return None, None, None

# Definir el tema y la interfaz de Gradio
theme = gr.themes.Soft(
    primary_hue="indigo",
    secondary_hue="indigo",
).set(
    background_fill_primary='#121212',  # Dark background
    background_fill_secondary='#1e1e1e',
    block_background_fill='#1e1e1e',  # Almost black
    block_border_color='#333',
    block_label_text_color='#fffff',
    block_label_text_color_dark = '#fffff',
    block_title_text_color_dark = '#fffff',
    button_primary_background_fill='#4f46e5',  # Violet
    button_primary_background_fill_hover='#2563eb',  # Light blue
    button_secondary_background_fill='#4f46e5',
    button_secondary_background_fill_hover='#2563eb',
    input_background_fill='#333',  # Dark grey
    input_border_color='#444',  # Intermediate grey
    block_label_background_fill='#4f46e5',
    block_label_background_fill_dark='#4f46e5',
    slider_color='#2563eb',
    slider_color_dark='#2563eb',
    button_primary_text_color='#fffff',
    button_secondary_text_color='#fffff',
    button_secondary_background_fill_hover_dark='#4f46e5',
    button_cancel_background_fill_hover='#444',
    button_cancel_background_fill_hover_dark='#444'
)

with gr.Blocks(theme=theme, css="""
    body, gradio-app {
      background-image: url('https://b2928487.smushcdn.com/2928487/wp-content/uploads/2022/04/Brain-inspiredAI-2048x1365.jpeg?lossy=1&strip=1&webp=1'); 
      background-size: cover;
      color: white;
    }
    .gradio-container {
      background-color: transparent;
      background-image: url('https://b2928487.smushcdn.com/2928487/wp-content/uploads/2022/04/Brain-inspiredAI-2048x1365.jpeg?lossy=1&strip=1&webp=1') !important; 
      background-size: cover !important;
      color: white;
    }
    .gradio-container .gr-dropdown-container select::after {
        content: '▼'; 
        color: white; 
        padding-left: 5px; 
    }
    .gradio-container .gr-dropdown-container select:focus {
        outline: none; 
        border-color: #4f46e5;
    }
    .gradio-container select {
      color: white;
    }  
    input, select, span, button, svg, .secondary-wrap {
      color: white; 
    }
               
    h1 {
        color: white;
        font-size: 4em;  
        margin: 20px auto;
    }
    .gradio-container h1 { 
        font-size: 5em;  
        color: white; 
        text-align: center; 
        text-shadow: 2px 2px 0px #8A2BE2,  
                     4px 4px 0px #00000033; 
        text-transform: uppercase;
        margin: 18px auto;
    }
    .gradio-container input { 
        color: white; 
    }
    .gradio-container .output { 
        color: white; 
    }
    .required-dropdown li {
      color: white;
    }
    .button-style {
      background-color: #4f46e5;
      color: white;
    }
    .button-style:hover {
      background-color: #2563eb;
      color: white;
    }
               
    .gradio-container .contain textarea {
      color: white;
      font-weight: 600;
      font-size: 1.5rem;
    }
    .contain textarea {
      color: white;
      font-weight: 600;
      font-size: 1.5rem;
    }     
    textarea {
      color: white;
      font-weight: 600;
      font-size: 1.5rem;
      background-color: black;
    }     
    textarea .scroll-hide {
      color: white;
    }
    .scroll-hide svelte-1f354aw {
      color: white;
    }
    """) as demo:

    gr.Markdown("# Brain Tumor Classification 🧠")

    with gr.Row():
        with gr.Column():
            image_input = gr.Image(type="pil", label="Sube la imagen")
            model_input = gr.Dropdown(choices=["model_1", "model_2"], label="Selecciona un modelo", elem_classes=['required-dropdown'])
            classify_btn = gr.Button("Clasificar", elem_classes=['button-style'])
            clear_btn = gr.Button("Limpiar")
        with gr.Column():
            prediction_output = gr.Textbox(label="Predicción")
    
    classify_btn.click(predict_image, inputs=[image_input], outputs=prediction_output)
    clear_btn.click(clear_inputs, inputs=[], outputs=[image_input, model_input, prediction_output])

demo.launch()