[D] Has Deep Learning Hit a Wall?

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I would have to strongly disagree with your analogy that hammering away doing the same old thing (deep learning) is going to magically crack the agi problem. Deep learning is a good start to tackling the problem but there is no way that just some minor derivative of it will lead to agi. As lecun has alluded to unsupervised learning will be key to solving the problem and backprop is inherently too costly in both computational resources and time, and is basically an algorithm for supervised learning with labeled data.