# Unable to access "Contrastive loss from Hadsell-et-al.'06"

**URL:** <https://community.deeplearning.ai/t/unable-to-access-contrastive-loss-from-hadsell-et-al-06/465752>\
**Category:** Custom Models, Layers and Loss Functions with TF\
**Tags:** week-module-1\
**Created:** [October 9, 2023, 6:16am UTC](https://community.deeplearning.ai/t/unable-to-access-contrastive-loss-from-hadsell-et-al-06/465752 "2023-10-09T06:16:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RominPlusFans](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/rominplusfans/32/64876_2.png) [@RominPlusFans](https://community.deeplearning.ai/u/RominPlusFans)\
**Post date:** [October 9, 2023, 6:16am UTC](https://community.deeplearning.ai/t/unable-to-access-contrastive-loss-from-hadsell-et-al-06/465752/1 "2023-10-09T06:16:24Z")

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The link provided: [http://yann.lecun.com/exdb/publis/pdf/hadsell-chopra-lecun-06.pdf](http://yann.lecun.com/exdb/publis/pdf/hadsell-chopra-lecun-06.pdf) requires a log-in in order to view the website.

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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:** [October 9, 2023, 6:44am UTC](https://community.deeplearning.ai/t/unable-to-access-contrastive-loss-from-hadsell-et-al-06/465752/3 "2023-10-09T06:44:25Z")

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Hello Romin,

are you doing the course of TF-AT?

I am able to open this pdf, probably I must have saved this pdf.

If you need,

refer the below link

> [@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

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**Author:** ![Wendy](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/wendy/32/8167_2.png) [@Wendy](https://community.deeplearning.ai/u/Wendy)\
**Post date:** [October 10, 2023, 12:36am UTC](https://community.deeplearning.ai/t/unable-to-access-contrastive-loss-from-hadsell-et-al-06/465752/4 "2023-10-10T00:36:06Z")

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Hi @RominPlusFans,  
The problem is that your browser is converting http://… to https://…  
You need to use http://…  
The simplest way might be to try using Safari or Firefox, if you are using Chrome.

Even easier is to use the alternate link @Deepti_Prasad provided here 😉  
But FYI, in case you run into this issue with another link.

See this post for more info:

> [@Yann.lecun.com is password protected](https://community.deeplearning.ai/t/yann-lecun-com-is-password-protected/243752):
>
> There are several links to the mentioned website eg in the following lecture For me it appears as password protected and I cannot reach the material