import numpy as np
from typing import Union
import gradio as gr

def subtract(a: float, b: float) -> float:
    """Subtract b from a."""
    try:
        return float(a) - float(b)
    except (ValueError, TypeError):
        raise ValueError("Both inputs must be valid numbers")

subtract_interface = gr.Interface(
    fn=subtract,
    inputs=[gr.Number(label="A"), gr.Number(label="B")],
    outputs="number",
    title="Subtraction",
    description="Subtract two numbers"
)