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alexcnwy

785 karma · joined May 14, 2017

Co-founder / CTO AiSupervision (YC W22)

YC Badge: 0x0c51bf0090235f2604af81df021023a3d62aa4d3

E: alex [@@@] numberboost.com

L: linkedin.com/in/alxcnwy/

X: @alxcnwy

Consulting: www.numberboost.com

Here is a vid of one my talks on deep learning for computer vision: https://www.youtube.com/watch?v=X4Q6C915sUY

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submissionscomments
alexcnwy··on AI Can Transform Anyone Into a Professional Dancer
This is incredible!

I wonder if seeing yourself dance like this might speed up learning to actually dance like this...

alexcnwy··on Show HN: Wikipedia2Vec – A tool for learning embeddings of words and entities
Very cool!

I'm currently busy with my MSc thesis on learning to link plain text documents to semantically relevant Wikipedia articles (and some of the cool machine learning-y things you can do from there).

I have 2 questions about your work:

1. I'm not sure if you're familiar with Doc2Vec but it allows you to train a Word2Vec model while also learning a vector for each document in the training corpus. Wikipedia is commonly used as a training corpus so you can get a "DocVec" for each Wikipedia article in the same vector space as your Word2Vec model (i.e. the DocVec for the Wikipedia page "Machine Learning" is nearby the WordVec for "mathematics"). Did you consider/compare with using Doc2Vec to learn a vector for each Wikipedia page and then use those as your entity vectors?

2. Your "Features" page says you convert an entity name to a link pointing to an entity if the entity name is unambiguou". In the case of ambiguous entities from a link (which happens often - my research is only learning links to Wikipedia articles from plain text documents), did you consider using the entity vectors (or some simple model built on top of the word vectors of the target page) to disambiguate?

alexcnwy··on The Twilio API for WhatsApp
Any word on pricing?
alexcnwy··on Ask HN: What are the things keep in mind while giving/preparing for a tech talk?
Casually give an informal version of the talk to some friends or colleagues to see if they "get it".

I find that talking it through a few times with someone will help you figure out which parts of your explanation are unclear and need rephrasing.

Also, don't take it too seriously - technical talks are already often dry - don't be afraid to insert some memes and jokes to keep the audience engaged!

alexcnwy··on RoboSat: feature extraction from aerial and satellite imagery
Very cool! Does anyone know any good global free satellite imagery datasets?
alexcnwy··on Learning ‘Montezuma’s Revenge’ from a single demonstration
This is highly significant because it was one of the games that the Atari games that the original Deep Q learning model could not beat.
alexcnwy··on Nobel Laureates Paul D. Boyer and Jens C. Skou Die at 99
I've been wanting to do an analysis of lifespans of Nobel vs the rest of the population since they seem to live longer than average.

Of course, you have to be alive to win so there's a survivorship bias but it'd be interesting to see a proper statistical analysis.

alexcnwy··on Counting Bees on a Raspberry Pi with a ConvNet
I think a CNN can handle scale invariance e.g. With max pooling
alexcnwy··on 'Google go home': the Berlin neighbourhood fighting off a tech giant
Dresden and Budapest much better options nearby :)
alexcnwy··on Reinforcement Learning – Bandit Problems
Bartow & Sutton is excellent.

You can definitely find it online but be sure to find the right version - the latest version has great illustrations and is a lot clearer.

Also, check out the RL jupyter notebook here by my friend Ryan Sweke who does work on RL for quantum computing: https://github.com/R-Sweke/CrashCourseInNeuralNetworksWithKe...

alexcnwy··on Our Approach to Employee Security Training
I think you totally miss the point. Explaining something by analogy can be the most effective way of "getting it". Everyone is different. You definitely cannot make such a bold statement about whether the approach was valid.
alexcnwy··on How Cambridge Analytica’s Facebook targeting model really worked
I don't think you understand what dimensionality reduction means.

SSN is a lookup key into the raw data. Dimensionality reduction is by definition lossy since it's used in scenarios where: rows of data = n <<< m = number of features

alexcnwy··on How Cambridge Analytica’s Facebook targeting model really worked
You're throwing out buzzwords instead of addressing the response.

It's dimensionality reduction. You cannot recover the original object. It's like using a shadow to reconstruct the face of the person casting the shadow.

Note this has nothing to do with the expressive power of a deep neural network. You are by definition trying to throw away noisy aspects of the data and generalize a lower dimensional manifold from a high dimensional space. If it's not lossy, it won't generalize.

alexcnwy··on Deciphering China’s AI Dream
I have to disagree - it could be the case that the algorithms are sufficient and all we need is more data and more compute.

I'd strongly recommend checking out Peter Norvig's talk on "The Unreasonable Effectiveness of Big Data"

alexcnwy··on GIMP Convolution Matrix
This great interactive really helped me understand what a convolution is:

http://setosa.io/ev/image-kernels/

Highly recommended!

alexcnwy··on GIMP Convolution Matrix
I think about it as a 2-D weighted average.

Not certain that's the correct intuition but it makes sense to me haha.

alexcnwy··on Semantic Image Segmentation with DeepLab in Tensorflow
Great summary. I believe both models are available in Detectron if anyone wants to give them a go:

https://github.com/facebookresearch/Detectron

alexcnwy··on Keras reimplementation of "One pixel attack for fooling deep neural networks"
What about applying dropout to the input image
alexcnwy··on Why Self-Taught Artificial Intelligence Has Trouble with the Real World
Not slavery but kind of. I'd rather the (computerized) self-driving car driver die than a real person.

There are also many jobs that are demeaning or not intrinsically rewarding for people like trash collection and some kinda of construction. Enslave the computers so the humans can focus on higher minded pursuits.

alexcnwy··on Launch HN: ClearBrain (YC W18) – predictive models for app conversions and churn
It's actually a first year statistics homework assignment to do an "AHA Moment" action analysis.

A random forest automatically gives you a "variable importance plot".

alexcnwy··on Launch HN: ClearBrain (YC W18) – predictive models for app conversions and churn
How is this different than Custora (also YC alumn)?
alexcnwy··on Bitcoin Visa debit cards are cancelled
Would love to see an analysis on QuantStamp :)
alexcnwy··on Bitcoin Visa debit cards are cancelled
Just read a few of your posts - great content and approach :)
alexcnwy··on AI-assisted fake porn are being used by people on Reddit for self-completion
Most obvious use-case to my mind is stock (or crypto) price manipulation. I wonder what would happen to the ETH price if Vitalik Buterin suddenly "announced" he has seen the light and is quitting ETH to work on DOGE :)
alexcnwy··on Gridcoin: Rewarding Scientific Distributed Computing
It's up 105% this week so someone thinks it's still alive.
alexcnwy··on Fundamentals of Linear Algebra and Optimization [pdf]
This is great!

There's so much hype about machine learning but so few people seem to appreciate the fundamental importance of linear algebra (especially in ML).

This fast.ai course is also great: http://www.fast.ai/2017/07/17/num-lin-alg/

alexcnwy··on Litecoin and Ethereum buys and sells are temporarily disabled
It can also lose 20x. Losses hurt more than gains feel good. Utility theory suggests to sell if probability weighting of loss is high enough.
alexcnwy··on An $814M Mystery Near the Heart of the Biggest Bitcoin Exchange
Interesting point :)
alexcnwy··on An $814M Mystery Near the Heart of the Biggest Bitcoin Exchange
Sound analysis! Quick question: what do you think is going to happen to BCH when coinbase unlocks users' tokens?
alexcnwy··on A Year in Computer Vision
Excellent!

I'd suggest anyone interested in jumping into building computer vision models should check out the excellent free MOOC on fast.ai

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