Modeling real-valued data
	• For images of digits it is possible to represent intermediate intensities as if they were probabilities by using “mean-field” logistic units. – We can treat intermediate values as the probability that the pixel is inked. • This will not work for real images. – In a real image, the intensity of a pixel is almost always almost exactly the average of the neighboring pixels. – Mean-field logistic units cannot represent precise intermediate values.