Data Scientist, Astrophysicist and aspiring Salsa dancer. All opinions here are my own and do not represent the views of my employer/university.

Joined March 2010
3 months ago I submitted my PhD thesis. It still hasn't really sunk in; and i'm not sure when it will!
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Dr. John Lopez retweeted
A former Marriott front desk agent said: "In 6 years, I checked in 90,000 guests. Not one of them ever asked me the question that would've changed their entire stay." "They asked for their reservation. They gave their name. They took the key. They walked to the elevator." "Not one of them ever asked: 'What rooms do you have available tonight?'" "That question changes everything. Because the answer is almost always: better rooms than the one you're about to get. The system auto-assigns you a room based on an algorithm that optimizes for inventory management not guest experience. It gives you the lowest-category room that matches your reservation. Standard king. Low floor. Parking lot side. That's the default." "But when you ask me what's available, I open the full inventory. I see the suites sitting empty. The corner rooms unbooked. The premium floors with views that nobody requested. And now I have a reason to move you because you asked." "In 6 years, I had the ability to upgrade guests on almost every single shift. Empty suites. Open premium rooms. Corner rooms with city views. They were there. Most nights. Most hotels. Most of the time." "90,000 guests. And not one of them asked what else existed." I asked her to tell me everything every trick, every mistake, every insider detail from 6 years and 90,000 check-ins behind the Marriott front desk. Here's all of it 🧵
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Dr. John Lopez retweeted
What the Artemis II astronauts did over the last 10 days was a testament to their bravery. And the fact that they traveled farther from Earth than anyone ever has, re-entered our atmosphere at more than 24,000 mph, and splashed down safely was a testament to human ingenuity. Thanks to everyone at @NASA for making this mission possible, and for taking us along for the ride.
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Official life-size Eeveelution plushies 🤯
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Dr. John Lopez retweeted
Get ready to choose your allegiance when Team Rocket returns in #PokemonTCG: #DestinedRivals 🚀 Will you join forces with Trainers like Cynthia, Ethan, and Arven or battle alongside Team Rocket this May 30, 2025?
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Who cares about Pokemon cards I NEED this fan for my desk
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Overwhelmed, excited, anxious, scared. I've been feeling so many emotions since I was given the news - never in my wildest dreams did I think I'd get to be a NASA Hubble Fellow 🤯 I love globular clusters so much and I'm incredibly grateful that I get to study them ✨
Meet the 2024 NASA Hubble Fellowship class! The 24 fellows will receive up to three years of support at a U.S. institution as they pursue independent research in any area of NASA astrophysics. Find out more: go.nasa.gov/43KFWHe
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Dr. John Lopez retweeted
🚨 Good Bye Reality Every single video in this thread was generated by Open AI's new text to video model "Sora" 🤯 🧵 1/48
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Dr. John Lopez retweeted
What idea changed how you view the world? Here's mine: High Agency. The high agency library: (19 best examples I've found in 4 years)
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Well, that's it. I've peaked in life having been cited in XKCD *and* making it into the alt text. Going to retire to nerd heaven now. xkcd.com/2886/
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Dr. John Lopez retweeted
I’m gonna give 10 random people that repost this and follow me $25,000 for fun (the $250,000 my X video made) I’ll pick the winners in 72 hours
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Dr. John Lopez retweeted
We did it! Today we released the Dark Energy Survey @theDESurvey supernova cosmology results!!! A massive effort from many people. This has been the prime focus of my research for the last decade, and it was an honour to co-lead this working group. What did we find?.... a 🧵
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Dr. John Lopez retweeted
PyTorch 101: Tensors clearly explained! Tensors are the fundamental building blocks for performing mathematical operations in deep learning models. Today, I will provide a comprehensive explanation with illustrative code examples. Let's go! 🚀
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Dr. John Lopez retweeted
Coding games are the best way to learn coding. From CSS, Python, JavaScript to Blockchain. Here are 10 of the BEST online games to learn coding in 2024:
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Dr. John Lopez retweeted
Eigenvalues & Eigenvectors clearly explained! The concept of eigenvalues & eigenvectors is widely known yet poorly understood! Today, I'll clearly explain their meaning & significance. Let's go! 🚀
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Dr. John Lopez retweeted
This tweet is about how I have studied ML and made it my profession. I'll share the resources I've used and the sequence of my study. Straight to point ML pre-requisites(maths) : Linear Algebra, Probability Theory, Calculus, Optimization Theory(optional), Information theory(optional) Linear Algebra: Lecture course by Gilbert Strang Probability theory: MIT 6.041 (it contains parts of Bayesian inference as well) Calculus: your high school and college classes are enough Once basic maths is done then we move to ML. Classical ML : CS229. Either by Andrew NG or someone else. Follow their lecture notes and solve their problem sets. Reference books for classical ML that I followed: PRML by Christopher bishop, Pattern Classification by Duda, Hart and Stork After getting comfortable with classical ML we move to Deep Learning and everything else. Deep Learning and Computer Vision: CS231n. Very good lecture and assignments Reference book: Deep Learning by Ian Goodfellow. This is the best book on deep learning. I’ve read some chapters of it many many times. Beautiful maths and intuitions MLOps: dvc, WandB, MLFlow NLP: I just read hugging face blogs. I haven’t spent much time with classical NLP though. Alignment/AI safety/AI explainability: Anthropic Blogs(I’m a noob in this, just started learning couple months ago) Additionally: Blogs: Lilian Weng(OpenAI)’s blogs, colah’s blogs Additionally: arxiv. I read many papers from arxiv Karas and Tensorflow blogs: for introductory code about modern deep learning frameworks Competitions: Kaggle Cloud compute. GCP/collab/Kaggle notebooks PS: this is not a roadmap. Just what I followed till now and I find it quite structured. Even after 5 years I still find myself learning new stuff everyday.
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Dr. John Lopez retweeted
I have been coding in Python for 8 years now.⏳ Here are 7️⃣ amazing Python libraries not known to many...👇
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Dr. John Lopez retweeted
Top 50 SQL queries during Interviews
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Dr. John Lopez retweeted
I started learning to code exactly 2 years ago and landed my first job as a Software Engineer in 2023. If I were to restart my programming journey, this is what I would do 🧵 :
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Dr. John Lopez retweeted
Physicists be like.
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Dr. John Lopez retweeted
Object oriented programming is essential for writing clean & modular code! Today, I'll clearly explain OOPs with Python! Let's go! 🚀
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