what.utils.proj 

 1import numpy as np
 2
 3# Deep Fool: Project on the lp ball centered at 0 and of radius xi
 4def proj_lp(v, xi=50, p=2):
 5
 6    # SUPPORTS only p = 2 and p = Inf for now
 7    if p == 2:
 8        v = v * min(1, xi/np.linalg.norm(v.flatten('C')))
 9        # v = v / np.linalg.norm(v.flatten(1)) * xi
10    elif p == np.inf:
11        v = np.sign(v) * np.minimum(abs(v), xi)
12    else:
13        raise ValueError('Values of p different from 2 and Inf are currently not supported...')
14
15    return v
def proj_lp(v, xi=50, p=2): 
 5def proj_lp(v, xi=50, p=2):
 6
 7    # SUPPORTS only p = 2 and p = Inf for now
 8    if p == 2:
 9        v = v * min(1, xi/np.linalg.norm(v.flatten('C')))
10        # v = v / np.linalg.norm(v.flatten(1)) * xi
11    elif p == np.inf:
12        v = np.sign(v) * np.minimum(abs(v), xi)
13    else:
14        raise ValueError('Values of p different from 2 and Inf are currently not supported...')
15
16    return v