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+rust port of python in http://neuralnetworksanddeeplearning.com/chap1.html
+
+main goal: me understanding what's going on
+
+done:
+* implementation that 'works' without runtime errors
+
+to do:
+* verify correctness
+* add unit tests
+* train using actual training data
+* evaluate with test/validation data
+* make more efficient
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