Trained model and additional material: https://mega.nz/#!CCRQQYjL!2ZKP39e40Bw5uDegAXeaBKO12dggtgu6ZRB2CX4XRck
 
References:  
[1] https://www.gwern.net/Danbooru2017  
[2] https://github.com/joshua-stone/DerPyBooru  
[3] https://pair-code.github.io/saliency/  
[4] https://www.reddit.com/r/MachineLearning/comments/7sn4p6/  
[5] http://norman-ai.mit.edu/
 
Seems like “relgukxilef” had similar plans:

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jzhorse
Gold Trophy - A trophy worthy of a truly elite achievement hunter.
Lunar er - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).

Filled with errors
@S-3125  
Could be pretty useful to… make more SFW filtering content…
 
My, 2 years already, I now lean towards data visualization rather than to train the model lately.
S-3125
Fifth Yacht -
Lunar er - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).
My Little Pony - 1992 Edition
Wallet After Summer Sale -

Memetic eldritch horror
I wonder how a visual transformer network would handle a problem like this. I imagine that it’s use of attention mechanisms would make it easier for it to spot porn
Background Pony #0960
@Ganondox  
At the bottom you see Equal Error Rate 9.48% (point when false positive rate = false negative rate). Indeed at this point the filter would not be the most accurate thing ever. However without more information we can’t say how well it would work if you set it very sensitive to detecting explicit images (we need ROC curve for that).
What’s the false positive and false negative rate? Because I’m not going to trust a filter for explicit content that only has %89 accuracy.
jzhorse
Gold Trophy - A trophy worthy of a truly elite achievement hunter.
Lunar er - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).

Filled with errors
Now that the subject I am studying can even be applied to manage pony porn.
 
This is hilarious!
Background Pony #0B3B
Better than Tumblr’s dumbass bots.
🐴
Office Culture - These water cooler conversations sure get heated around here.
Diamond Trophy - Are you a TAS by any chance?
Artist -
Magnificent Metadata Maniac - #1 Assistant
Solar Guardian - Refused to surrender in the face of the Lunar rebellion and showed utmost loyalty to the Solar Empire (April Fools 2023).
Non-Fungible Trixie -
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice

notification horse
This is amazing work! It would be very complimentary with the AI pony name generator.
Rory Kenneigh
Fifth Yacht -
Lunar er - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).
Perfect Pony Plot Provider - er of 10+ images with 350 upvotes or more (Questionable/Explicit)
Non-Fungible Trixie -
Artist -

Lord of all Whorses
Oh hey, that’s my penis!
Background Pony #F56F
@Background Pony #D6DA
 
Ah yes, my bad! I thought I was commenting on the [suggestive] version of the image ^^.
 
Yes, it is a non-explicit image which got high score for explicit. tag: "explicit" means the saliency map is computed for tag [explicit]. ittedly it is rather suggestive image, which is probably why it got high score. This image was not in the training set.
Background Pony #9DE6
@Background Pony #CE34
 
That’s not what I meant, although I may have misunderstood. >>1748971, here on Derpibooru, is not tagged “explicit.” In the image above, you say ‘tag: “explicit”’ underneath it. Do you mean that this is a non-explicit image which the program improperly thought was explicit? I just want to make sure a teaching image didn’t get miscategorized.
this is beautiful!
Background Pony #F56F
@dashbug  
Much like #9793 said, that model is not even aware of clop images and hence gives nonsense with such images.
 
I run this model here on the images you posted, and got 99% and 61% “explicit-percentage”.
 
(Sidenote: Ponies could make more interesting nsfw-detection dataset, because ponies come in different colors and shapes. Last time I checked, isitporn.com seems to focus on naked-skin color. We would rather want it to find explicit bits, much like this model did with the cherry-picked examples)
Background Pony #FF04
@dashbug  
That’s because it’s trained to detect IRL porn, not clop.
AuroraFang
Fifth Yacht -
Bronze Trophy - Achievement Hunter
Lunar er - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).
Roseluck - Had their OC in the 2023 Derpibooru Collab.
Princess of Love - Extra special version for those who participated in the Canterlot Wedding 10th anniversary event by contributing art.
Tree of Harmony - Drew someone's OC for the 2022 Community Collab
Elements of Harmony - Had an OC in the 2022 Community Collab
Twinkling Balloon - Took part in the 2021 community collab.
A Really Classy Artist - 250+ images under their artist tag
Friendship, Art, and Magic (2020) -

Digital Artist
O.O?
>5% of the images (18.5k) were kept for evaluation (not used for training)  
I have such the best excuse if anyone finds my stash now
I can’t agree with you. That site doesn’t work correctly.  
Examples:  
http://isitporn.com/show/9a5c12fa91a7400d9d5ecaa8a5cdbe2d  
http://isitporn.com/show/d9ae26db4104466f89eb64d54f5312b7  
These explicit images are believed to be safe.
 
… But my cat images (even with only visible face) are almost nsfw
yoditax
Pixel Perfection - I still call her Lightning Bolt
Chaotic Little Trees - 1000+ images under their artist tag
Preenhub - We all know what you were up to this evening~
Verified Pegasus - Show us your gorgeous wings!
Hard Work - Merited Perfect Pony Plot Provider badge with only their own art
Perfect Pony Plot Provider - er of 10+ images with 350 upvotes or more (Questionable/Explicit)
Charitable Contributor - Contributed to a series of art packs that helped raise over $10,000 for charity
Best Artist - Providing quality, Derpibooru-exclusive artwork
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.
The Power of Love - Given to a publicly verified artist with an image under their artist’s tag that has reached 1000 upvotes >>1748508

Assistant
Gayrity
Hey my art’s there 👋
Background Pony #71BA
Gwern.net in the citations? Oh god, the streams are crossing again.
Background Pony #F56F
But >>1748971 isn’t tagged explicit?
 
Indeed it isn’t. I first aimed to tag this [safe] (hence the censor), but ultimately sticked with [suggestive] but kept the censor-block ^^’
Background Pony #5D28
@The Luna Fan  
This is almost as impressive as that AI that writes commercials for Olive Garden.
Background Pony #9DE6
But >>1748971 isn’t tagged explicit?
The Luna Fan
The Luna Fan - For Patreon ers
Fifth Yacht -
Different Timelines, Same Faces - Celebrated the 15th anniversary of MLP:FiM!
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Bronze Trophy - Achievement Hunter
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Celestial Glory - Helped others get their OC into the 2024 Derpibooru Collab.
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!

At The Edge Of The Rules
Perfect, an AI that looks for clop, humanity is at it’s pick now!