<human>:  how to ensure function return type.
<bot>: Here is a Python program to ensure return type

import numpy as np

def ensure_return_type(function, return_type):
  """
  Ensure that the function return type is return_type
  """
  def wrapper(*args, **kwargs):
    return function(*args, **kwargs)
  return wrapper

# Enter the function

def my_function(x):
  return x + 1

# Enter the return type
return_type = np.int32

# Calling the function
print((ensure_return_type(my_function, return_type)(1)))

#Example Output
# 2

#Remember to inspect code for bugs.