The toughest data science interview I ever had

I got bombarded for 45 minutes with theoretical questions:

๐Ÿ”ธ Entropy
๐Ÿ”ธ KL divergence, other divergences
๐Ÿ”ธ Kolmogorov complexity
๐Ÿ”ธ Jacobian and Hessian
๐Ÿ”ธ Linear independence
๐Ÿ”ธ Determinant

Continued ๐Ÿ‘‡

๐Ÿ”ธ Eigenvalues and Eigenvectors
๐Ÿ”ธ SVD
๐Ÿ”ธ The norm of a vector
๐Ÿ”ธ Independent random variables
๐Ÿ”ธ Expectation and variance
๐Ÿ”ธ Central limit theorem

๐Ÿ‘‡
๐Ÿ”ธ Gradient descent and SGD
๐Ÿ”ธ Other optimization methods
๐Ÿ”ธ The dimension of gradient and hessian for a neural net with 1k params
๐Ÿ”ธ What is SVM
๐Ÿ”ธ Linear vs non-linear SVM
๐Ÿ”ธ Quadratic optimization

๐Ÿ‘‡
๐Ÿ”ธ What to do when a neural net overfits
๐Ÿ”ธ What is autoencoder
๐Ÿ”ธ How to train an RNN
๐Ÿ”ธ How decision trees work
๐Ÿ”ธ Random forest and GBM
๐Ÿ”ธ How to use random forest on data with 30k features
๐Ÿ”ธ Favorite ML algorithm - tell about it in details

That was tough!

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THREAD: 12 Things Everyone Should Know About IQ

1. IQ is one of the most heritable psychological traits โ€“ that is, individual differences in IQ are strongly associated with individual differences in genes (at least in fairly typical modern environments). https://t.co/3XxzW9bxLE


2. The heritability of IQ *increases* from childhood to adulthood. Meanwhile, the effect of the shared environment largely fades away. In other words, when it comes to IQ, nature becomes more important as we get older, nurture less.
https://t.co/UqtS1lpw3n


3. IQ scores have been increasing for the last century or so, a phenomenon known as the Flynn effect. https://t.co/sCZvCst3hw (N โ‰ˆ 4 million)

(Note that the Flynn effect shows that IQ isn't 100% genetic; it doesn't show that it's 100% environmental.)


4. IQ predicts many important real world outcomes.

For example, though far from perfect, IQ is the single-best predictor of job performance we have โ€“ much better than Emotional Intelligence, the Big Five, Grit, etc. https://t.co/rKUgKDAAVx https://t.co/DWbVI8QSU3


5. Higher IQ is associated with a lower risk of death from most causes, including cardiovascular disease, respiratory disease, most forms of cancer, homicide, suicide, and accident. https://t.co/PJjGNyeQRA (N = 728,160)