app.py

import gradio as gr
import tensorflow as tf
import gdown
import urllib.request
from PIL import Image

import os
import cv2
import numpy as np
import keras.backend as K


#from tensorflow import keras

resized_shape = (768, 768, 3)
IMG_SCALING = (1, 1)

# def get_opencv_img_from_buffer(buffer, flags=cv2.IMREAD_COLOR):
#     bytes_as_np_array = np.frombuffer(buffer.read(), dtype=np.uint8)
#     return cv2.imdecode(bytes_as_np_array, flags)

# Download the model file
def download_model():
    url = "https://drive.google.com/uc?id=1FhICkeGn6GcNXWTDn1s83ctC-6Mo1UXk"
    output = "seg_unet_model.h5"
    gdown.download(url, output, quiet=False)
    return output

model_file = download_model()

#Custom objects for model

def Combo_loss(y_true, y_pred, eps=1e-9, smooth=1):
    targets = tf.dtypes.cast(K.flatten(y_true), tf.float32)
    inputs = tf.dtypes.cast(K.flatten(y_pred), tf.float32)
    
    intersection = K.sum(targets * inputs)
    dice = (2. * intersection + smooth) / (K.sum(targets) + K.sum(inputs) + smooth)
    inputs = K.clip(inputs, eps, 1.0 - eps)
    out = - (ALPHA * ((targets * K.log(inputs)) + ((1 - ALPHA) * (1.0 - targets) * K.log(1.0 - inputs))))
    weighted_ce = K.mean(out, axis=-1)
    combo = (CE_RATIO * weighted_ce) - ((1 - CE_RATIO) * dice)
    return combo

def dice_coef(y_true, y_pred, smooth=1):
    y_pred = tf.dtypes.cast(y_pred, tf.int32)
    y_true = tf.dtypes.cast(y_true, tf.int32)
    intersection = K.sum(y_true * y_pred, axis=[1,2,3])                     
    union = K.sum(y_true, axis=[1,2,3]) + K.sum(y_pred, axis=[1,2,3])           
    return K.mean((2 * intersection + smooth) / (union + smooth), axis=0)

# Load the model
seg_model = tf.keras.models.load_model('seg_unet_model.h5', custom_objects={'Combo_loss': Combo_loss, 'dice_coef': dice_coef})

inputs = gr.inputs.Image(type="numpy", label="Upload an image", source="upload")
image_output = gr.outputs.Image(type="numpy", label="Output Image")
# outputs = gr.outputs.HTML() #uncomment for single class output 

def gen_pred(img=inputs, model=seg_model):
    # rgb_path = os.path.join(test_image_dir,img)
    # img = cv2.imread(rgb_path)
    # img = cv2.imread("./003e2c95d.jpg")
    img = img[::IMG_SCALING[0], ::IMG_SCALING[1]]
    img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    img = img/255
    img = tf.expand_dims(img, axis=0)
    pred = model.predict(img)
    pred = np.squeeze(pred, axis=0)
    return pred


title = "<h1 style='text-align: center;'>Semantic Segmentation</h1>"
description = "Upload an image and get prediction mask"
# css_code='body{background-image:url("file=wave.mp4");}'

gr.Interface(fn=gen_pred, 
             inputs=inputs, 
             outputs=image_output, 
             title=title, 
             examples=[["003e2c95d.jpg"], ["003b50a15.jpg"], ["003b48a9e.jpg"], ["0038cbe45.jpg"], ["00371aa92.jpg"]],
             # css=css_code,
             description=description,
            enable_queue=True).launch()