app.py

import pickle
import pandas as pd
import shap
from shap.plots._force_matplotlib import draw_additive_plot
import gradio as gr
import numpy as np
import matplotlib.pyplot as plt


theme = gr.themes.Default(primary_hue="blue").set(
    background_fill_primary="#D3D3D3",
    block_background_fill="#D3D3D3",
)


# load the model from disk
loaded_model = pickle.load(open("heart_xgbV2.pkl", 'rb'))

# Setup SHAP
explainer = shap.Explainer(loaded_model) # PLEASE DO NOT CHANGE THIS.

gender_dict = {"Male":0,"Female":1}
cp_dict = {"Typical Angina":0, "Atypical Angina":1, "Non-Anginal":2, "Asymptomatic":3}
fbs_dict = {"Yes":1,"No":0}
exng_dict = {"Yes":1,"No":0}
restecg_dict = {"Normal":0, "Having ST-T abnormality":1, "Showing probable or definite left ventricular hypertrophy by Estes' Criteria":2}
thall_dict = {"Fixed Defect":1, "Normal Blood Flow":2, "Reversible Defect":3}
slp_dict = {"Upsloping":1, "Flat":2, "Downsloping":3}

# Create the main function for server
def main_func(age, sex, cp, trtbps, chol, fbs, restecg,thalachh,exng,oldpeak,slp,caa,thall):
    new_row = pd.DataFrame.from_dict({'age':age,'sex':gender_dict[sex],
              'cp':cp_dict[cp],'trtbps':trtbps,'chol':chol,
              'fbs':fbs_dict[fbs], 'restecg':restecg_dict[restecg], 'thalachh':thalachh, 'exng':exng_dict[exng],
                                     'oldpeak':oldpeak,'slp':slp_dict[slp],'caa':caa,'thall':thall_dict[thall]}, 
                                     orient = 'index').transpose()
    
    prob = loaded_model.predict_proba(new_row)
    
    shap_values = explainer(new_row)
    # plot = shap.force_plot(shap_values[0], matplotlib=True, figsize=(30,30), show=False)
    # plot = shap.plots.waterfall(shap_values[0], max_display=6, show=False)
    plot = shap.plots.bar(shap_values[0], max_display=6, order=shap.Explanation.abs, show_data='auto', show=False)

    plt.tight_layout()
    local_plot = plt.gcf()
    plt.close()
    
    return {"Lower Chance of a Heart Attack": float(prob[0][0]), "Higher Chance of a Heart Attack": 1-float(prob[0][0])}, local_plot

# Create the UI
title = "**Heart Attack Predictor & Interpreter** 🪐"
description1 = "This app takes info from subjects and predicts their heart attack likelihood."

description_notmedical="**Do not use for medical diagnosis.**"


description2 = "**Fill all the options** or no result will be generated!!!**"


description3 = "To use the app, please fill all the options, and click on Analyze. 🤞"


descriptionExamples = "If you would like to see how the model works, please scroll down and try one of the examples!"


##Pinak
with gr.Blocks(title=title, theme=theme) as demo:

    gr.Markdown("<span style='color: #FF0000;font-size: 20px'> **Heart Attack Predictor & Interpreter** 🪐</span>")
    gr.Markdown("""---""")
    gr.Markdown("<span style='font-size: 20px;'> **Do not use for medical diagnosis.**")
    gr.Markdown("""---""")
    gr.Markdown("<span style='font-size: 16px;'> If you would like to see how the model works, please scroll down and try one of the examples!")
    gr.Markdown("""---""")
    gr.Markdown("<span style='font-size: 16px;'> This app takes info from subjects and predicts their heart attack likelihood.")
    gr.Markdown("""---""")
    gr.Markdown("<span style='font-size: 16px;'> To use the app, please fill in all the options, and click on Analyze. 🤞")
    gr.Markdown("<span style='font-size: 16px;'> **Fill all the options or no result will be generated!!!**")
    gr.Markdown("""---""")
    
    with gr.Row():
        with gr.Column():
            age = gr.Number(label="What is your age?", value=40)
        with gr.Column():
            slp = gr.Dropdown(["Upsloping", "Flat", "Downsloping"], label="What was the slope of the peak exercise ST segment?")
            
    with gr.Row(): 
        with gr.Column():
            sex = gr.Radio(["Female", "Male"], label = "What is your sex?")
            cp = gr.Radio(["Typical Angina", "Atypical Angina", "Non-Anginal", "Asymptomatic"], label = "What kind of chest pain is it?")
        with gr.Column():
            restecg = gr.Radio(["Normal", "Having ST-T abnormality", "Showing probable or definite left ventricular hypertrophy by Estes' Criteria"], 
                                  label = "What is your resting ECG result?")
            
    with gr.Row():
        with gr.Column():
            fbs = gr.Radio(["Yes", "No"], label = "Is your fasting Blood Sugar >120 mg/dl?")
        with gr.Column():
            exng = gr.Radio(["Yes", "No"], label = "Do you have Exercise Induced Angina?")
    with gr.Row():
        with gr.Column():
            caa = gr.Radio([1, 2, 3], label="How many vessels were colored by the fluoroscopy?")
            
        with gr.Column():
            thall = gr.Radio(["Fixed Defect", "Normal Blood Flow", "Reversible Defect"],  label="What is your Thalassemia condition?")
            
    with gr.Row():
        with gr.Column():
            trtbps = gr.Slider(label = "What is your resting blood Pressure (in mm Hg)?", minimum = 10, maximum = 250, value = 100, step = 1)
            
        with gr.Column():
            chol = gr.Slider(label = "What is your cholesterol in mg/dl (via BMI sensor)?", minimum = 30, maximum = 300, value = 180, step = 1)
    with gr.Row():      
        with gr.Column():
            oldpeak = gr.Slider(label = "What was the ST depression induced by exercise relative to rest?", minimum = 0, maximum = 6.2, step = 0.1)
        with gr.Column():
            thalachh = gr.Slider(label="What is your maximum heart rate?", minimum = 60, maximum = 250, value=100, step = 1)
            

    with gr.Row():
            submit_btn = gr.Button("Analyze")

##Do not need to touch    
    with gr.Column(visible=True) as output_col:
            label = gr.Label(label = "Predicted Label")
            local_plot = gr.Plot(label = 'Shap:')
    
    submit_btn.click(
            main_func,
            [age, sex, cp, trtbps, chol, fbs, restecg,thalachh,exng,oldpeak,slp,caa,thall],
            [label,local_plot], api_name="Heart_Predictor"
        )

    gr.Examples([[24, "Male", "Typical Angina", 130, 150, "Yes", "Having ST-T abnormality",170, "Yes", 5.1, "Flat", 2, "Normal Blood Flow"],
                 [59, "Female", "Non-Anginal", 150, 170, "No", "Showing probable or definite left ventricular hypertrophy by Estes' Criteria",190, "No", 6, "Upsloping", 3, "Reversible Defect"]], [age, sex, cp, trtbps, chol, fbs, restecg, thalachh,exng,oldpeak,slp,caa,thall], [label,local_plot], main_func, cache_examples=True)

demo.launch()