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a new area of Machine Learning research concerned with the technologies used for learning hierarchical representations of data, mainly done with deep neural networks (i.e. networks with two or more hidden layers), but also with some sort of Probabilistic Graphical Models.

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Why in this case are gradient steps not perpendicular to contour lines?

There is a theorem that gradient at point is perpendicular to tangent line to contour line at given point. Why in this picture it seems that this rule is not respected? source: http://www.deeplearn …
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