W1A3: Wrong grad_check difference but the result makes me wonder if I'm missing a 1-difference

Course Q&A Deep Learning Specialization Improving Deep Neural Networks: Hyperparameter tun
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Had two other errors:

  1. Not noticing the difference calculation was outside a for loop: Week 1 Gradient Checking gradient_check_n - Deep Learning Specialization / DLS Course 2 - DeepLearning.AI
  2. A copy paste error on calculating tetha_minus[i]: Course-2 : Week -1 Assignments, Programming Assignment: Gradient Checking - Deep Learning Specialization / DLS Course 2 - DeepLearning.AI
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