Recsysml
@recsysml.bsky.social
https://recsysml.substack.com/
RecSysML focuses on applied machine learning within recommender systems, covering topics such as generative recommendations, contextual bandits for ad placement, and ranking model calibration.
RecSysML focuses on applied machine learning within recommender systems, covering topics such as generative recommendations, contextual bandits for ad placement, and ranking model calibration.
An openness to experiment: contrary to popular perception bigtech’s money earning machines have not shifted over to LLMs but there is a top to down increase in the willingness to experiment new things. There is a lot more situational innovation in bigtech now.
January 18, 2026 at 8:41 PM
An openness to experiment: contrary to popular perception bigtech’s money earning machines have not shifted over to LLMs but there is a top to down increase in the willingness to experiment new things. There is a lot more situational innovation in bigtech now.
2026 will be the year where fluff is called out on Wall Street
January 12, 2026 at 2:56 PM
2026 will be the year where fluff is called out on Wall Street
A big change is coming in recsys. Long ago ranking models were actually ranking when it was doing pairwise ranking. Then it became an estimator model in the era of VM. Can we unlock all the RL advances of LLMs by making ranking a reward maximizing model again.
open.substack.com/pub/recsysml...
open.substack.com/pub/recsysml...
The Case for RL-Aligned Ranking in RecSys
Why recsys industry is stuck on probability estimation, and how RLHF is the missing link.
open.substack.com
January 10, 2026 at 6:23 PM
A big change is coming in recsys. Long ago ranking models were actually ranking when it was doing pairwise ranking. Then it became an estimator model in the era of VM. Can we unlock all the RL advances of LLMs by making ranking a reward maximizing model again.
open.substack.com/pub/recsysml...
open.substack.com/pub/recsysml...
#LLM vs #RecommenderSystems (Part 2/3) 👉 recsysml.substack.com/p/recsys-ret... is about Retrieval.
And this is where the analogy with LLMs becomes surprisingly tight.
Core idea:
Retrieval in recommender systems plays the same role as pretraining in LLMs.
We show clustering > "Semantic IDs"
And this is where the analogy with LLMs becomes surprisingly tight.
Core idea:
Retrieval in recommender systems plays the same role as pretraining in LLMs.
We show clustering > "Semantic IDs"
December 20, 2025 at 8:30 PM
#LLM vs #RecommenderSystems (Part 2/3) 👉 recsysml.substack.com/p/recsys-ret... is about Retrieval.
And this is where the analogy with LLMs becomes surprisingly tight.
Core idea:
Retrieval in recommender systems plays the same role as pretraining in LLMs.
We show clustering > "Semantic IDs"
And this is where the analogy with LLMs becomes surprisingly tight.
Core idea:
Retrieval in recommender systems plays the same role as pretraining in LLMs.
We show clustering > "Semantic IDs"
In this three part series I compare #LLM and #RecommenderSystems to show the gaps and opportunities. They are surprisingly fewer than one would think.
Part 1 open.substack.com/pub/recsysml...
Part 1 open.substack.com/pub/recsysml...
Ranking Models explained: Deep Dive into RecSys Architecture (Features, Embeddings, & Attention)
Watch now (18 mins) | What happens post retrieval in a recommender system
open.substack.com
December 6, 2025 at 5:51 PM
In this three part series I compare #LLM and #RecommenderSystems to show the gaps and opportunities. They are surprisingly fewer than one would think.
Part 1 open.substack.com/pub/recsysml...
Part 1 open.substack.com/pub/recsysml...
Reposted by Recsysml
@bsky.app please enable rage shakes
Also when I watch a video in full screen, after that the only thing I can do is close the app since all controls are not visible.
Also when I watch a video in full screen, after that the only thing I can do is close the app since all controls are not visible.
November 27, 2025 at 8:44 PM
@bsky.app please enable rage shakes
Also when I watch a video in full screen, after that the only thing I can do is close the app since all controls are not visible.
Also when I watch a video in full screen, after that the only thing I can do is close the app since all controls are not visible.
For folks who are following the trend of “generative recommendations”, I’d love to know what you feel is the best ight version of semantic id in your domain. For instance if we were to build a feed ranking for Bluesky using generative recs what would the “semantic” id be?
November 24, 2025 at 6:28 AM
For folks who are following the trend of “generative recommendations”, I’d love to know what you feel is the best ight version of semantic id in your domain. For instance if we were to build a feed ranking for Bluesky using generative recs what would the “semantic” id be?
Reposted by Recsysml
Tesla Q3 2025 California sales were down 9% YoY despite the huge rush for BEVs ahead of the Sept-30th expiry of the $7,500 tax credit.
The BEV market ex-Tesla grew by 29% YoY in Q3, causing Tesla's share of California's BEV market to drop from 57% in Q3 2024 to 48%.
www.cncda.org/news/califor...
The BEV market ex-Tesla grew by 29% YoY in Q3, causing Tesla's share of California's BEV market to drop from 57% in Q3 2024 to 48%.
www.cncda.org/news/califor...
November 21, 2025 at 1:57 AM
Tesla Q3 2025 California sales were down 9% YoY despite the huge rush for BEVs ahead of the Sept-30th expiry of the $7,500 tax credit.
The BEV market ex-Tesla grew by 29% YoY in Q3, causing Tesla's share of California's BEV market to drop from 57% in Q3 2024 to 48%.
www.cncda.org/news/califor...
The BEV market ex-Tesla grew by 29% YoY in Q3, causing Tesla's share of California's BEV market to drop from 57% in Q3 2024 to 48%.
www.cncda.org/news/califor...
Reposted by Recsysml
this warms the cockles of my heart. "These giants are standing tall against fossil fuels, rising up out of the ocean like a middle finger against CO2."
August 2, 2025 at 7:34 PM
this warms the cockles of my heart. "These giants are standing tall against fossil fuels, rising up out of the ocean like a middle finger against CO2."
Reposted by Recsysml
“Only in NYC can you have a pedicab driving down the street with tourists blasting Billy Joel’s music — and Billy Joel pulls up next to them.” 💕
- @wutangforchildren.bsky.social
- @wutangforchildren.bsky.social
August 3, 2025 at 1:35 PM
“Only in NYC can you have a pedicab driving down the street with tourists blasting Billy Joel’s music — and Billy Joel pulls up next to them.” 💕
- @wutangforchildren.bsky.social
- @wutangforchildren.bsky.social
At some point people are going to ask if it is really worth it, are their better alternatives to this, by better I mean just fair, just honest and transparent
July 26, 2025 at 11:10 PM
At some point people are going to ask if it is really worth it, are their better alternatives to this, by better I mean just fair, just honest and transparent
Reposted by Recsysml
This Osprey is so majestic…. 🥰
And in the bird world this is considered a sick move….
And in the bird world this is considered a sick move….
July 20, 2025 at 10:56 AM
This Osprey is so majestic…. 🥰
And in the bird world this is considered a sick move….
And in the bird world this is considered a sick move….
The words still stand youtu.be/F2AitTPI5U0?...
Michael Jackson - Black Or White (Official Video - Shortened Version)
YouTube video by michaeljacksonVEVO
youtu.be
July 20, 2025 at 5:11 AM
The words still stand youtu.be/F2AitTPI5U0?...
Reposted by Recsysml
Aidan Bedford
"Interspecies interaction between humpback whale and bottlenose dolphins."
"Interspecies interaction between humpback whale and bottlenose dolphins."
July 18, 2025 at 8:41 PM
Aidan Bedford
"Interspecies interaction between humpback whale and bottlenose dolphins."
"Interspecies interaction between humpback whale and bottlenose dolphins."
Working on PyTorch implementation of traditional retrieval to generative recs github.com/gauravchak/g...
My goal is to help #recsysml ppl in my team and otherwise to understand the leap to #llm style modeling.
My goal is to help #recsysml ppl in my team and otherwise to understand the leap to #llm style modeling.
GitHub - gauravchak/generative_friending_recommendations: This repository walks through a few ideas of how to implement generative recommendations for friending recommendations and in doing so describ...
This repository walks through a few ideas of how to implement generative recommendations for friending recommendations and in doing so describes the complexity or what is uniquely difficult in frie...
github.com
July 14, 2025 at 1:38 PM
Working on PyTorch implementation of traditional retrieval to generative recs github.com/gauravchak/g...
My goal is to help #recsysml ppl in my team and otherwise to understand the leap to #llm style modeling.
My goal is to help #recsysml ppl in my team and otherwise to understand the leap to #llm style modeling.
Reposted by Recsysml
AAAAAAA I JUST RECORDED THIS!!!! best lightning capture of my life
July 12, 2025 at 8:11 PM
AAAAAAA I JUST RECORDED THIS!!!! best lightning capture of my life
Reposted by Recsysml
Daughter of street vendor asking why police aren't helping!! Broken heart 💔
🖕🏽 LAPD
🖕🏽 LAPD
July 9, 2025 at 10:56 PM
Daughter of street vendor asking why police aren't helping!! Broken heart 💔
🖕🏽 LAPD
🖕🏽 LAPD
Reposted by Recsysml
Sometimes you see articles about child math prodigies that turn out to be them proving an aesthetically pleasing but useless bit of trivia, but this looks like the first case (since Tao?) of a 17-year old girl solving a major open problem in a single author paper english.elpais.com/science-tech...
July 7, 2025 at 5:10 PM
Sometimes you see articles about child math prodigies that turn out to be them proving an aesthetically pleasing but useless bit of trivia, but this looks like the first case (since Tao?) of a 17-year old girl solving a major open problem in a single author paper english.elpais.com/science-tech...
Reposted by Recsysml
Right now the default is set to newest which is great for a following timeline but less useful for replies imo.
June 16, 2025 at 1:03 AM
Right now the default is set to newest which is great for a following timeline but less useful for replies imo.
Reposted by Recsysml
Reporter: I'm going to show you what 20,000 people in the streets of downtown Los Angeles looks like
June 14, 2025 at 8:04 PM
Reporter: I'm going to show you what 20,000 people in the streets of downtown Los Angeles looks like
Reposted by Recsysml
There is no woke - there is corporate tyrannies - with language of division and diversion - from tax the rich -
June 12, 2025 at 11:04 PM
There is no woke - there is corporate tyrannies - with language of division and diversion - from tax the rich -
Deeply saddened and perplexed by the Air India crash today. I hope we find out why
June 12, 2025 at 3:00 PM
Deeply saddened and perplexed by the Air India crash today. I hope we find out why
Reposted by Recsysml
At some point we're going to have to stop asking "when is (insert name) going to step up and say he's gone to far" and realize that maybe they are ok with the president's actions. We must realize that no one is going to swoop in and "save" us, it has to be us... we the people.
Good morning
Good morning
June 11, 2025 at 1:20 PM
At some point we're going to have to stop asking "when is (insert name) going to step up and say he's gone to far" and realize that maybe they are ok with the president's actions. We must realize that no one is going to swoop in and "save" us, it has to be us... we the people.
Good morning
Good morning