[Python] NameError: name 'cv2' is not define while trying to run def __init__(self, width,...

I am trying to sun some neural network code with cv2 and getting error

def __init__(self, width, height, inter=cv2.INTER_AREA):
^^^
NameError: name 'cv2' is not define

knn.py --dataset ./datasets/animals
Traceback (most recent call last):
File "/Users/test/Desktop/CODE/knn.py", line 6, in <module>
from pyimagesearch.preprocessing import SimplePreprocessor
File "/Users/test/Desktop/CODE/pyimagesearch/preprocessing/SimplePreprocessor.py", line 4, in <module>
class SimplePreprocessor:
File "/Users/test/Desktop/CODE/pyimagesearch/preprocessing/SimplePreprocessor.py", line 5, in SimplePreprocessor
def __init__(self, width, height, inter=cv2.INTER_AREA):
^^^
NameError: name 'cv2' is not defined

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