'numpy.ndarray' object has no attribute 'ceil'

This error occurs when you try to call the `ceil()` function on a NumPy array, but the function is not defined for arrays.

The `ceil()` function is defined for individual elements of an array, but not for the entire array. To apply the `ceil()` function to all elements of the array, you can use the `numpy.ceil()` function instead.

Here is an example:

import numpy as np

arr = np.array([1.2, 2.5, 3.8])
# arr.ceil() # This will raise an AttributeError

arr_ceil = np.ceil(arr)
print(arr_ceil) # Output: [2. 3. 4.]

In this example, calling `arr.ceil()` raises an AttributeError because the `ceil()` function is not defined for the array itself. Instead, we use the `numpy.ceil()` function to apply the `ceil()` function to all elements of the array, and store the result in a new array `arr_ceil`.