app.py

import streamlit as st
from huggingface_hub import HfApi, HfFolder
from datasets import load_dataset

# Function to fetch dataset names for typeahead (autocomplete)
def fetch_dataset_names(query):
    api = HfApi()
    datasets = api.list_datasets()
    filtered_datasets = [d.id for d in datasets if query.lower() in d.id.lower()]
    return filtered_datasets

# Function to create a new dataset
def create_sampled_dataset(dataset_name, num_rows, user_token):
    # Load the dataset
    dataset = load_dataset(dataset_name)

    # Sample the dataset
    sampled_dataset = dataset['train'].shuffle().select(range(num_rows))

    # Save the sampled dataset to a file (modify this as needed)
    sampled_dataset.to_csv('sampled_dataset.csv')

    # Here you'd need to implement the logic to upload this dataset to the user's Hf account
    # This part is not straightforward and requires using the Hf API to create a new dataset repo
    # You'll need to refer to the Hf API documentation for details on how to implement this

    return "URL_to_new_dataset"  # This should be the URL to the newly created dataset

# Main app
def main():
    st.title("HuggingFace Dataset Sampler")

    # User authentication
    user_token = st.text_input("Enter your HuggingFace token for authentication")

    # Dataset input with typeahead
    dataset_query = st.text_input("Enter Dataset Name")
    if dataset_query:
        dataset_names = fetch_dataset_names(dataset_query)
        selected_dataset = st.selectbox("Select Dataset", options=dataset_names)
    else:
        selected_dataset = None

    # Number of rows input
    num_rows = st.number_input("Enter number of rows to sample", min_value=1, step=1)

    # Button to create new dataset
    if st.button("Create Sampled Dataset"):
        if user_token and selected_dataset and num_rows:
            try:
                # Create the sampled dataset and get its URL
                dataset_url = create_sampled_dataset(selected_dataset, num_rows, user_token)
                st.success(f"Dataset created successfully! Find it here: {dataset_url}")
            except Exception as e:
                st.error(f"Error: {e}")
        else:
            st.error("Please fill in all required fields.")

if __name__ == "__main__":
    main()