app.py

import gradio as gr

with gr.Blocks() as demo:
    gr.Markdown("# Train a Text Classifier with Synthetic Data")
    labels = gr.Dropdown(choices=[], value=[], label="Classes", allow_custom_value=True, multiselect=True)
    
    @gr.render(inputs=[labels])
    def show_textbox(labels_):
        with gr.Row():
            for label in labels_:
                gr.TextArea(label=f"Samples for class: {label}")
        if len(labels_)>=2:
            with gr.Row():
                gr.Button("TRAIN!", variant="primary")

demo.launch()