app.py

import os
import torch
from torch.utils.data import Dataset, DataLoader
import pandas as pd
import numpy as np
import joblib
import gradio as gr
import plotly.graph_objects as go
from io import BytesIO
from PIL import Image
from torchvision import transforms,models
from sklearn.preprocessing import LabelEncoder,MinMaxScaler
from gradio import Interface, Image, Label, HTML
from huggingface_hub import snapshot_download

# Retrieve the token from the environment variables
token = os.environ.get("token")

# Download the repository snapshot
local_dir = snapshot_download(
    repo_id="robocan/GeoG_coordinate",
    repo_type="model",
    local_dir="SVD",
    token=token
)

device = 'cpu'
le = LabelEncoder()
le = joblib.load("SVD/le.gz")
MMS = joblib.load("SVD/MMS.gz")
len_classes = len(le.classes_) + 1

class ModelPre(torch.nn.Module):
    def __init__(self):
        super().__init__()
        self.embedding = torch.nn.Sequential(
            *list(models.convnext_small(weights=models.ConvNeXt_Small_Weights.IMAGENET1K_V1).children())[:-1],
            torch.nn.Flatten(),
            torch.nn.Linear(in_features=768,out_features=512),
            torch.nn.ReLU(),
            torch.nn.Linear(in_features=512,out_features=len_classes),
        )
        # Freeze all layers

    def forward(self, data):
        return self.embedding(data)
    
# Load the pretrained model 
model = ModelPre()
#for param in model.parameters():
#   param.requires_grad = False
class GeoGcord(torch.nn.Module):
    def __init__(self):
        super().__init__()
        self.embedding = torch.nn.Sequential(
            *list(model.children())[0][:-1],
            torch.nn.Linear(in_features=512,out_features=256),
            torch.nn.ReLU(),
            torch.nn.Linear(in_features=256,out_features=128),
            torch.nn.ReLU(),
            torch.nn.Linear(in_features=128,out_features=2),
        )
        # Freeze all layers

    def forward(self, data):
        return self.embedding(data)
    
    

# Load the pre-trained model 
model = GeoGcord()
model_w = torch.load("SVD/GeoG.pth", map_location=torch.device(device))

model.load_state_dict(model_w['model'])

cmp = transforms.Compose([
    transforms.ToTensor(),
    transforms.Resize(size=(224, 224), antialias=True),
    transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
])

# Predict function for the new regression model
def predict(input_img):
    with torch.inference_mode():
        img = cmp(input_img).unsqueeze(0)
        res = model(img.to(device))
        # Assuming res is a 2-layer regression output, and MMS.inverse_transform is needed
        prediction = MMS.inverse_transform(res.cpu().numpy()).flatten()
        return prediction

# Function to generate Plotly map figure
def create_map_figure(lat, lon):
    fig = go.Figure(go.Scattermapbox(
        lat=[lat],
        lon=[lon],
        mode='markers',
        marker=go.scattermapbox.Marker(
            size=14
        ),
        text=[f'Lat: {lat}, Lon: {lon}'],
        hoverinfo='text'
    ))

    fig.update_layout(
        mapbox_style="open-street-map",
        hovermode='closest',
        mapbox=dict(
            bearing=0,
            center=go.layout.mapbox.Center(
                lat=lat,
                lon=lon
            ),
            pitch=0,
            zoom=10
        ),
    )

    return fig

# Create label output function
def create_label_output(predictions):
    lat, lon = predictions
    fig = create_map_figure(lat, lon)
    return fig

# Predict and plot function
def predict_and_plot(input_img):
    predictions = predict(input_img)
    return create_label_output(predictions)

# Gradio app definition
with gr.Blocks() as gradio_app:
    with gr.Column():
        input_image = gr.Image(label="Upload an Image", type="pil")
        output_map = gr.Plot(label="Predicted Location on Map")
        btn_predict = gr.Button("Predict")

        btn_predict.click(predict_and_plot, inputs=input_image, outputs=output_map)
        examples = ["GB.PNG", "IT.PNG", "NL.PNG", "NZ.PNG"]
        gr.Examples(examples=examples, inputs=input_image)
    gradio_app.launch()