# Cannot access to - Learning a Similarity Metric Discriminatively, with Application to Face Verification (Chopra, Hadsell, & LeCun, 2005)

**URL:** <https://community.deeplearning.ai/t/cannot-access-to-learning-a-similarity-metric-discriminatively-with-application-to-face-verification-chopra-hadsell-lecun-2005/592731>\
**Category:** Custom Models, Layers and Loss Functions with TF\
**Tags:** week-module-1\
**Created:** [March 17, 2024, 4:28pm UTC](https://community.deeplearning.ai/t/cannot-access-to-learning-a-similarity-metric-discriminatively-with-application-to-face-verification-chopra-hadsell-lecun-2005/592731 "2024-03-17T16:28:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dovud\_Asadov](https://avatars.discourse-cdn.com/v4/letter/d/5f9b8f/32.png) [@Dovud\_Asadov](https://community.deeplearning.ai/u/Dovud_Asadov)\
**Post date:** [March 17, 2024, 4:28pm UTC](https://community.deeplearning.ai/t/cannot-access-to-learning-a-similarity-metric-discriminatively-with-application-to-face-verification-chopra-hadsell-lecun-2005/592731/1 "2024-03-17T16:28:43Z")

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When i clicked to references ( - [Learning a Similarity Metric Discriminatively, with Application to Face Verification](http://yann.lecun.com/exdb/publis/pdf/chopra-05.pdf) (Chopra, Hadsell, & LeCun, 2005)) at the end of Lesson, it asked login and password. How can I access to it?

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**Author:** ![Deepti\_Prasad](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/deepti_prasad/32/165831_2.png) [@Deepti\_Prasad](https://community.deeplearning.ai/u/Deepti_Prasad)\
**Post date:** [March 17, 2024, 4:35pm UTC](https://community.deeplearning.ai/t/cannot-access-to-learning-a-similarity-metric-discriminatively-with-application-to-face-verification-chopra-hadsell-lecun-2005/592731/2 "2024-03-17T16:35:03Z")

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Hello @Dovud_Asadov

Kindly refer the below link to get the linked article

> [@Dimensionality Reduction by Learning an Invariant Mapping](https://community.deeplearning.ai/t/dimensionality-reduction-by-learning-an-invariant-mapping/465772):
>
> Hello, Learners looking for the link related to Contrastive Loss pdf by Yann LeCun, TF-AT Specialisation, Course 1, Week 2 Can download the pdf from here point_down[hadsell-chopra-lecun-06.pdf](https://community.deeplearning.ai/uploads/short-url/zoMZhj86J7LQyTBsAV0yh4BWcQe.pdf) (719.2 KB) Regards DP

Regards  
DP