# Uncategorized

**URL:** https://community.deeplearning.ai/c/uncategorized/1.md

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## [Welcome to DeepLearning.AI Community](https://community.deeplearning.ai/t/welcome-to-deeplearning-ai-community/7)

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**Author:** [@system](https://community.deeplearning.ai/u/system)\
**Replies:** 0\
**Last updated:** [January 28, 2021, 8:05pm UTC](https://community.deeplearning.ai/t/welcome-to-deeplearning-ai-community/7 "2021-01-28T20:05:03Z")

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Welcome to the DeepLearning.AI Community! We’re excited to have you join our growing community of learners. This is your one-stop shop for all things Deep Learning! Ask questions, share your progress, network with fello…

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## [Inquiring about how to submit my assignments](https://community.deeplearning.ai/t/inquiring-about-how-to-submit-my-assignments/896087)

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**Author:** [@Oseremen\_Oriaifo](https://community.deeplearning.ai/u/Oseremen_Oriaifo)\
**Replies:** 1\
**Last updated:** [November 1, 2026, 8:40pm UTC](https://community.deeplearning.ai/t/inquiring-about-how-to-submit-my-assignments/896087 "2026-11-01T20:40:54Z")

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How can I submit my lab assignment

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## [L2\_research\_write\_article](https://community.deeplearning.ai/t/l2-research-write-article/895887)

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**Author:** [@Hassan\_Almousa1](https://community.deeplearning.ai/u/Hassan_Almousa1)\
**Replies:** 1\
**Last updated:** [October 26, 2026, 7:55pm UTC](https://community.deeplearning.ai/t/l2-research-write-article/895887 "2026-10-26T19:55:43Z")

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This lab code is now outdated , gpt-3.5-turbo is depreciated. the lab does not work anymore . changing the model to modern models ( sol ) also breaks due to some changes related to the paramters accepted by the model it…

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## [Wk 2 Cost function in propagate uses np.trace, not np.sum--why?](https://community.deeplearning.ai/t/wk-2-cost-function-in-propagate-uses-np-trace-not-np-sum-why/2040)

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**Author:** [@ktkc](https://community.deeplearning.ai/u/ktkc)\
**Replies:** 3\
**Last updated:** [May 3, 2021, 10:43pm UTC](https://community.deeplearning.ai/t/wk-2-cost-function-in-propagate-uses-np-trace-not-np-sum-why/2040 "2021-05-03T22:43:58Z")

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While the grader lets you “pass” the tests for this function when you use np.sum in the cost function, to match the expected output, you have to use np.trace instead (which roughly halves the cost). What is the advantag…