Error in verify()

Course Q&A Deep Learning Specialization Convolutional Neural Networks
1

i’m getting the rerror in verify() function of week 4 assignment 1.
Any help is appreciated
My code is:

Step 1: Compute the encoding for the image. Use img_to_encoding() see example above. (≈ 1 line)

encoding = img_to_encoding(image_path,model)
# Step 2: Compute distance with identity's image (≈ 1 line)
dist = np.linalg.norm(database[identity],encoding)
# Step 3: Open the door if dist < 0.7, else don't open (≈ 3 lines)
if dist< 0.7:
    print("It's " + str(identity) + ", welcome in!")
    door_open = True
else:
    print("It's not " + str(identity) + ", please go away")
    door_open = False

the error its giving
ValueError Traceback (most recent call last)
in
1 # BEGIN UNIT TEST
----> 2 assert(np.allclose(verify(“images/camera_1.jpg”, “bertrand”, database, FRmodel), (0.54364836, True)))
3 assert(np.allclose(verify(“images/camera_3.jpg”, “bertrand”, database, FRmodel), (0.38616243, True)))
4 assert(np.allclose(verify(“images/camera_1.jpg”, “younes”, database, FRmodel), (1.3963861, False)))
5 assert(np.allclose(verify(“images/camera_3.jpg”, “younes”, database, FRmodel), (1.3872949, False)))

in verify(image_path, identity, database, model)
20 encoding = img_to_encoding(image_path,model)
21 # Step 2: Compute distance with identity’s image (≈ 1 line)
—> 22 dist = np.linalg.norm(database[identity],encoding)
23 # Step 3: Open the door if dist < 0.7, else don’t open (≈ 3 lines)
24 if dist< 0.7:

<array_function internals> in norm(*args, **kwargs)

/opt/conda/lib/python3.7/site-packages/numpy/linalg/linalg.py in norm(x, ord, axis, keepdims)
2468 if ((ord is None) or
2469 (ord in (‘f’, ‘fro’) and ndim == 2) or
→ 2470 (ord == 2 and ndim == 1)):
2471
2472 x = x.ravel(order=‘K’)

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

2

You are supplying two arguments to np.linalg.norm. It takes a single array as the argument. This causes it to interpret the second argument as some other parameter, which is the cause of the error. I think the intention is to take the norm of the difference of the two arrays, which would (of course) be a single input.

Also note that you can use tf.norm, since we’re doing TensorFlow here.

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