TypeError: only integer scalar arrays can be converted to a scalar index

This error typically occurs when trying to use a non-integer value as an index, or when attempting to convert a non-integer array to a single scalar value.

For example, if you have a numpy array with floating-point values and try to use it as an index:

import numpy as np

arr = np.array([1.5, 2.5, 3.5])
print(arr[1.5])

This will result in a "TypeError: only integer scalar arrays can be converted to a scalar index" because the index value of 1.5 is not an integer.

To fix this, you can convert the index value to an integer using the `int()` function:

import numpy as np

arr = np.array([1.5, 2.5, 3.5])
print(arr[int(1.5)])

Alternatively, if you have a non-integer array and are trying to convert it to a scalar value, you can use functions like `np.sum()` or `np.mean()` to calculate a single value from the array:

import numpy as np

arr = np.array([1.5, 2.5, 3.5])
total = np.sum(arr)
print(total)