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Training dataset · input + label
handwritten 0
label 0
handwritten 1
label 1
handwritten 4
label 4
handwritten 6
label 6
handwritten 7
label 7
grid of many handwritten digits
…plus a few more tens of thousands of examples.
The queue
a very complicated function · pixels in, a digit out
≈ 10,000 adjustable parameters (weights)
Prediction
label 0
 the function’s answer
 
no label attached
0examples seenpaused: tweaking the weights…
12% 98% accuracy