app.py

import streamlit as st
import plotly.graph_objects as go
import torch
from transformers import AutoModelForTokenClassification, AutoTokenizer
import requests

def search_geonames(location):
    api_endpoint = "http://api.geonames.org/searchJSON"
    username = "zekun"  

    params = {
        'q': location,
        'username': username,
        'maxRows': 5
    }

    response = requests.get(api_endpoint, params=params)
    data = response.json()

    if 'geonames' in data:
        fig = go.Figure()  
        for place_info in data['geonames']:
            latitude = float(place_info.get('lat', 0.0))
            longitude = float(place_info.get('lng', 0.0))

            fig.add_trace(go.Scattermapbox(
                lat=[latitude],
                lon=[longitude],
                mode='markers',
                marker=go.scattermapbox.Marker(
                    size=10,
                    color='orange',
                ),
                text=[f'Location: {location}'],
                hoverinfo="text",
                hovertemplate='<b>Location</b>: %{text}',
            ))

        fig.update_layout(
            mapbox_style="open-street-map",
            hovermode='closest',
            mapbox=dict(
                bearing=0,
                center=go.layout.mapbox.Center(
                    lat=latitude,
                    lon=longitude
                ),
                pitch=0,
                zoom=2
            ))

        st.plotly_chart(fig)
    
    # Return an empty figure
    return go.Figure()


def mapping(location):
    st.write(f"Mapping location: {location}")

    search_geonames(location)



def generate_human_readable(tokens,labels):
    ret = []
    for t,lab in zip(tokens,labels):
        if t == '[SEP]':
            continue

        if t.startswith("##") :
            assert len(ret) > 0
            ret[-1] = ret[-1] + t.strip('##')

        elif lab==2:
            assert len(ret) > 0
            ret[-1] = ret[-1] + " "+ t.strip('##')
        else:
            ret.append(t)

    return ret



def showOnMap(input_sentence):
    # get the location names: 

    model_name = "zekun-li/geolm-base-toponym-recognition"

    tokenizer = AutoTokenizer.from_pretrained(model_name)
    model = AutoModelForTokenClassification.from_pretrained(model_name)

    tokens = tokenizer.encode(input_sentence, return_tensors="pt")

    outputs = model(tokens) 

    predicted_labels = torch.argmax(outputs.logits, dim=2)

    predicted_labels = predicted_labels.detach().cpu().numpy()

    # "id2label": { "0": "O", "1": "B-Topo", "2": "I-Topo"  }

    predicted_labels = [model.config.id2label[label] for label in predicted_labels[0]]

    predicted_labels = torch.argmax(outputs.logits, dim=2)

    query_tokens = tokens[0][torch.where(predicted_labels[0] != 0)[0]]

    query_labels = predicted_labels[0][torch.where(predicted_labels[0] != 0)[0]]

    human_readable = generate_human_readable(tokenizer.convert_ids_to_tokens(query_tokens), query_labels)
    #['Los Angeles', 'L . A .', 'California', 'U . S .', 'Southern California', 'Los Angeles', 'United States', 'New York City']

    return human_readable





def show_on_map():

    input = st.text_area("Enter a sentence:", height=200)

    st.button("Submit")

    places = showOnMap(input)

    selected_place = st.selectbox("Select a location:", places)
    mapping(selected_place)



if __name__ == "__main__":
    show_on_map()