定義如下階躍函數時出現警告，
def step_function(x):
return np.array(x > 0, dtype=np.int)DeprecationWarning: `np.int` is a deprecated alias for the builtin `int`. To silence this warning, use `int` by itself. Doing this will not modify any behavior and is safe. When replacing `np.int`, you may wish to use e.g. `np.int64` or `np.int32` to specify the precision. If you wish to review your current use, check the release note link for additional information.
Deprecated in NumPy 1.20; for more details and guidance: NumPy 1.20.0 Release Notes — NumPy v1.24.dev0 Manual
解決辦法：
def step_function(x):
return np.array(x > 0, dtype=np.int64)
