I am not able to solve this error, can someone help?

Your problem is with the compute_cost function you must be doing something wrong there, try to revise it and check of the outputs are correct.

I checked my code, and I am getting correct answer in this trial run, but not in the actual test.

Your code must work correct for any initial values of w and b.
Not just when they’re zeros.

Getting the expected results with zeros doesn’t prove very much, since zero times anything will still be zero. That can hide a lot of errors.

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Okay, thank you for the insight.