X-Git-Url: https://piware.de/gitweb/?p=handwriting-recognition.git;a=blobdiff_plain;f=README.md;h=3af0686d6972af783a60d8ca377d150c54e01cad;hp=760002f714dd303e786e5d55989023d9a15d2ede;hb=1de3cdb5ecba32a8a3b0a02bbf71e883383a689d;hpb=579223dbae47c81cd315f5b575bfd9f6647890f5

diff --git a/README.md b/README.md
index 760002f..3af0686 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ Basics:
  - [Neuron](https://en.wikipedia.org/wiki/Artificial_neuron)
  - [Perceptron](https://en.wikipedia.org/wiki/Perceptron)
  - [Backpropagation](https://en.wikipedia.org/wiki/Backpropagation)
+ - [Understanding & Creating Neural Networks with Computational Graphs from Scratch](https://www.kdnuggets.com/2019/08/numpy-neural-networks-computational-graphs.html)
  - [3Blue1Brown video series](https://www.youtube.com/playlist?list=PLZHQObOWTQDNU6R1_67000Dx_ZCJB-3pi)
 
 Too high-level for first-time learning, but apparently very abstract and powerful for real-life:
@@ -67,3 +68,20 @@ real	0m37.927s
 user	1m19.103s
 sys	1m10.169s
 ```
+
+ - This is way too slow. I found an [interesting approach](https://www.kdnuggets.com/2019/08/numpy-neural-networks-computational-graphs.html) that harnesses the power of numpy by doing the computations for lots of images in parallel, instead of spending a lot of time in Python on iterating over tens of thousands of examples. Now the accuracy computation takes only negligible time instead of 6 seconds, and each round of training takes less than a second:
+```
+$ time ./train.py
+output vector of first image: [0.50863223 0.50183558 0.50357349 0.50056673 0.50285531 0.5043152
+ 0.51588292 0.49403    0.5030618  0.51006963]
+classification of first image: 6 with confidence 0.5158829224337754; real label 7
+correctly recognized images after initialization: 9.58%
+cost after training round 0: 1.0462266880961681
+[...]
+cost after training round 99: 0.4499245817840479
+correctly recognized images after training: 11.35%
+
+real	1m51.520s
+user	4m23.863s
+sys	2m31.686s
+```