AssertionError in the Week2 practice lab: linear regression

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

Hello everyone. I have an assertion error (in the first programming assignment, week 2, course 1) and I tried to figure out the problem (even reviewing previous answers in the community). But still I cannot solve the issue.

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Hi @BENGONO_ESSOLA_Edoua ,

This is your first post ! Welcome to the community!

Regarding your error, please make sure that the indentation inside the for-loop is ok for all lines. Python needs a proper indentation of instructions that go under the for.

Also: Please delete your code as it goes against the Code of Conduct to publish code in this space.

Thank you!

Juan

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Hi @BENGONO_ESSOLA_Edoua

Your cost_sum is done outside of the for loop, so the cost is changed every time it loops round the loop. The cost_sum should be inside the for loop.

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4

I think your code is not indented correctly.
Python uses indentation levels to organize blocks of code.

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Thank you. I am trying to delete it. Sorry

6

Thank you very much!

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I will remove the code from the replies.

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8

curiously I get the right answer = “Cost at initial w: 75.203”

but get the folowing error:
AssertionError: Case 1: Cost must be 0 for a perfect prediction but got 12.134178884999997

9

Thank you very much every. I corrected the indentation and the problem was solved. I enjoyed the exercise!

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I can’t see any errors in my indentation in my for loop: everything is indented one tab setting, my final line “total_cost = cost_sum/(2*m)” is aligned with “for” That’s the way class examples write the code?

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It doesnt have to be aligned with the For line, but need to be indented, which means aligned with what is inside the For loop (indented with respect to For)

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I know my explanation is not really clear. I just have a very small experience in programming

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My output:

<class ‘numpy.float64’>
Cost at initial w: 75.203

AssertionError Traceback (most recent call last)
in
9 # Public tests
10 from public_tests import *
—> 11 compute_cost_test(compute_cost)

~/work/public_tests.py in compute_cost_test(target)
9 initial_b = 3.0
10 cost = target(x, y, initial_w, initial_b)
—> 11 assert cost == 0, f"Case 1: Cost must be 0 for a perfect prediction but got {cost}"
12
13 # Case 2

AssertionError: Case 1: Cost must be 0 for a perfect prediction but got 12.134178884999997

14

I believe python relies on tabs to be expanded into a fixed number of spaces. Four is pretty typical.

The entire code inside the function must be indented from column 1, otherwise Python thinks you have already ended the function.