coursera Stanford Machine Learning Week5 Ex4機器學習 實驗4
Programming Exercise 4:Neural Networks Learning 1.神經網絡 1.1 觀察數據 本次實驗數據與實驗3一樣，是m=5000個手寫數字的灰階圖像。其中每個數字（0--9）各500個，每個圖像爲20x20的像素。所以X爲5000x400的Matrix。Y對應每個圖像的值（10 -- 9）10代表數字0。displayData函數將從數據集X中隨機選100條
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