ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

This error occurs when you try to use a NumPy array as a boolean expression in a way that is ambiguous. For example, if you have an array of boolean values and you try to use it in an if statement, NumPy doesn't know whether you want to evaluate the truth value of the entire array or just a single element.

To fix this error, you need to use the `.any()` or `.all()` method of the array to explicitly specify how you want to evaluate the truth value. For example, if you want to check if any element in the array is True, you would use:

if my_array.any():
    # Do something

If you want to check if all elements in the array are True, you would use:

if my_array.all():
    # Do something