raise ValueError("Input must be >= 2-d.") ValueError: Input must be >= 2-d.

This error message indicates that the input provided to a function or method should be a matrix or an array with at least two dimensions. In other words, the input should have multiple rows and columns, rather than being a one-dimensional list or array.

To fix this error, you can modify the input so that it has at least two dimensions. For example, if you have a list of numbers, you can convert it to a 2D array using numpy:

import numpy as np

my_list = [1, 2, 3, 4, 5]
my_array = np.array(my_list).reshape(-1, 1)

This will create a 2D array with one column and five rows. If you need a different shape, you can adjust the reshape arguments accordingly. Once you have a 2D array, you can pass it to the function or method without encountering the ValueError.