import hogpy
import numpy as np


def extract(im, nb_bins=9, cwidth=8, block_size=2, unsigned_dirs=True, clip_val=.2):
    # Your additional code goes here
    pixels = im.flatten()
    im_shape = np.shape(im)
    x_dim = im_shape[0]
    y_dim = im_shape[1]
    stride = im_shape[0]
    grayscale = True
    return hogpy.hog(pixels, x_dim, y_dim, stride, nb_bins, cwidth, block_size, unsigned_dirs, clip_val, grayscale)