（02）pynq 簡易圖像識別（2GraphicRecognition）

# numpy provides arrays and useful functions for working with them
import numpy
# scipy.special for the sigmoid function expit()
import scipy.special
# scipy.ndimage for rotating image arrays
import scipy.ndimage
import matplotlib.pyplot
# ensure the plots are inside this notebook, not an external window
%matplotlib inline
import imageio

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# （一）引入神經網絡
# （1）定義神經網絡
# neuralNetwork輸入參數：
# inputnodes, hiddennodes,outputnodes, learningrate
# wih == 輸入層權重     who == 輸出層權重
# activation function == sigmoid函數(S激活函數)
# inverse_activation_function == sigmoid的反函數
class neuralNetwork:
    def __init__(self, inputnodes, hiddennodes, outputnodes, learningrate):
        self.inodes = inputnodes
        self.hnodes = hiddennodes
        self.onodes = outputnodes