Getting Assertion error while executing Exercise 4 - initialize_with_zeros in Logistic_Regression_with_a_Neural_Network_mindset

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

Hi,

Can someone please tell why I am getting Assertion error while executing Exercise 4 - initialize_with_zeros in Logistic_Regression_with_a_Neural_Network_mindset

GRADED FUNCTION: initialize_with_zeros

​
def initialize_with_zeros(dim):
“”"
This function creates a vector of zeros of shape (dim, 1) for w and initializes b to 0.

Argument:
dim -- size of the w vector we want (or number of parameters in this case)

Returns:
w -- initialized vector of shape (dim, 1)
b -- initialized scalar (corresponds to the bias) of type float
"""

# (≈ 2 lines of code)
# w = ...
# b = ...
# YOUR CODE STARTS HERE

Moderator Edit: Code Removed
# YOUR CODE ENDS HERE

return w, b

dim = 2
w, b = initialize_with_zeros(dim)
​
assert type(b) == float
print ("w = " + str(w))
print ("b = " + str(b))
​
initialize_with_zeros_test(initialize_with_zeros)

AssertionError Traceback (most recent call last)
in
2 w, b = initialize_with_zeros(dim)
3
----> 4 assert type(b) == float
5 print ("w = " + str(w))
6 print ("b = " + str(b))

AssertionError:

2

Hi, @Naval_Midha. The assert statement tests that the parmeter b is of Python object type float. It did not pass and so “threw” an AssertionError. Python distinguishes between floating point numbers and integers (object type int). You have most likely defined b as an integer. For example, x = 2 defines x as type int. The easiest way to fix this is to include a decimal point: x = 2. The Python function float also works, i.e. x = float(2) but why waste the keystrokes? :smiley:

2 Likes
3

Hi Kenb, thanks for your help! It worked. Something new learnt today :slight_smile:

4

As I understand, W is zeros of dimension dim and b is a scalar value of 0.0? I too am getting the assertion error, can’t figure out what I am doing wrong?

AssertionError Traceback (most recent call last)
in
2 w, b = initialize_with_zeros(dim)
3
----> 4 assert type(b) == float
5 print ("w = " + str(w))
6 print ("b = " + str(b))

AssertionError: