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Neural_Network/convolution_neural_network.py
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305
Neural_Network/convolution_neural_network.py
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#-*- coding: utf-8 -*-
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'''
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- - - - - -- - - - - - - - - - - - - - - - - - - - - - -
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Name - - CNN - Convolution Neural Network For Photo Recognizing
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Goal - - Recognize Handing Writting Word Photo
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Detail：Total 5 layers neural network
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* Convolution layer
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* Pooling layer
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* Input layer layer of BP
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* Hiden layer of BP
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* Output layer of BP
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Author: Stephen Lee
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Github: 245885195@qq.com
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Date: 2017.9.20
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- - - - - -- - - - - - - - - - - - - - - - - - - - - - -
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'''
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import numpy as np
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import matplotlib.pyplot as plt
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class CNN():
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def __init__(self,conv1_get,size_p1,bp_num1,bp_num2,bp_num3,rate_w=0.2,rate_t=0.2):
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'''
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:param conv1_get: [a,c,d]，size, number, step of convolution kernel
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:param size_p1: pooling size
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:param bp_num1: units number of flatten layer
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:param bp_num2: units number of hidden layer
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:param bp_num3: units number of output layer
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:param rate_w: rate of weight learning
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:param rate_t: rate of threshold learning
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'''
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self.num_bp1 = bp_num1
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self.num_bp2 = bp_num2
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self.num_bp3 = bp_num3
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self.conv1 = conv1_get[:2]
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self.step_conv1 = conv1_get[2]
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self.size_pooling1 = size_p1
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self.rate_weight = rate_w
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self.rate_thre = rate_t
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self.w_conv1 = [np.mat(-1*np.random.rand(self.conv1[0],self.conv1[0])+0.5) for i in range(self.conv1[1])]
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self.wkj = np.mat(-1 * np.random.rand(self.num_bp3, self.num_bp2) + 0.5)
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self.vji = np.mat(-1*np.random.rand(self.num_bp2, self.num_bp1)+0.5)
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self.thre_conv1 = -2*np.random.rand(self.conv1[1])+1
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self.thre_bp2 = -2*np.random.rand(self.num_bp2)+1
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self.thre_bp3 = -2*np.random.rand(self.num_bp3)+1
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def save_model(self,save_path):
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#save model dict with pickle
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import pickle
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model_dic = {'num_bp1':self.num_bp1,
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'num_bp2':self.num_bp2,
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'num_bp3':self.num_bp3,
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'conv1':self.conv1,
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'step_conv1':self.step_conv1,
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'size_pooling1':self.size_pooling1,
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'rate_weight':self.rate_weight,
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'rate_thre':self.rate_thre,
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'w_conv1':self.w_conv1,
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'wkj':self.wkj,
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'vji':self.vji,
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'thre_conv1':self.thre_conv1,
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'thre_bp2':self.thre_bp2,
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'thre_bp3':self.thre_bp3}
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with open(save_path, 'wb') as f:
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pickle.dump(model_dic, f)
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print('Model saved： %s'% save_path)
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@classmethod
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def ReadModel(cls,model_path):
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#read saved model
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import pickle
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with open(model_path, 'rb') as f:
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model_dic = pickle.load(f)
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conv_get= model_dic.get('conv1')
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conv_get.append(model_dic.get('step_conv1'))
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size_p1 = model_dic.get('size_pooling1')
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bp1 = model_dic.get('num_bp1')
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bp2 = model_dic.get('num_bp2')
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bp3 = model_dic.get('num_bp3')
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r_w = model_dic.get('rate_weight')
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r_t = model_dic.get('rate_thre')
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#create model instance
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conv_ins = CNN(conv_get,size_p1,bp1,bp2,bp3,r_w,r_t)
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#modify model parameter
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conv_ins.w_conv1 = model_dic.get('w_conv1')
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conv_ins.wkj = model_dic.get('wkj')
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conv_ins.vji = model_dic.get('vji')
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conv_ins.thre_conv1 = model_dic.get('thre_conv1')
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conv_ins.thre_bp2 = model_dic.get('thre_bp2')
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conv_ins.thre_bp3 = model_dic.get('thre_bp3')
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return conv_ins
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def sig(self,x):
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return 1 / (1 + np.exp(-1*x))
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def do_round(self,x):
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return round(x, 3)
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def convolute(self,data,convs,w_convs,thre_convs,conv_step):
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#convolution process
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size_conv = convs[0]
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num_conv =convs[1]
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size_data = np.shape(data)[0]
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#get the data slice of original image data, data_focus
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data_focus = []
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for i_focus in range(0, size_data - size_conv + 1, conv_step):
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for j_focus in range(0, size_data - size_conv + 1, conv_step):
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focus = data[i_focus:i_focus + size_conv, j_focus:j_focus + size_conv]
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data_focus.append(focus)
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#caculate the feature map of every single kernel, and saved as list of matrix
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data_featuremap = []
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Size_FeatureMap = int((size_data - size_conv) / conv_step + 1)
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for i_map in range(num_conv):
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featuremap = []
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for i_focus in range(len(data_focus)):
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net_focus = np.sum(np.multiply(data_focus[i_focus], w_convs[i_map])) - thre_convs[i_map]
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featuremap.append(self.sig(net_focus))
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featuremap = np.asmatrix(featuremap).reshape(Size_FeatureMap, Size_FeatureMap)
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data_featuremap.append(featuremap)
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#expanding the data slice to One dimenssion
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focus1_list = []
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for each_focus in data_focus:
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focus1_list.extend(self.Expand_Mat(each_focus))
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focus_list = np.asarray(focus1_list)
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return focus_list,data_featuremap
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def pooling(self,featuremaps,size_pooling,type='average_pool'):
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#pooling process
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size_map = len(featuremaps[0])
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size_pooled = int(size_map/size_pooling)
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featuremap_pooled = []
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for i_map in range(len(featuremaps)):
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map = featuremaps[i_map]
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map_pooled = []
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for i_focus in range(0,size_map,size_pooling):
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for j_focus in range(0, size_map, size_pooling):
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focus = map[i_focus:i_focus + size_pooling, j_focus:j_focus + size_pooling]
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if type == 'average_pool':
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#average pooling
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map_pooled.append(np.average(focus))
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elif type == 'max_pooling':
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#max pooling
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map_pooled.append(np.max(focus))
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map_pooled = np.asmatrix(map_pooled).reshape(size_pooled,size_pooled)
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featuremap_pooled.append(map_pooled)
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return featuremap_pooled
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def _expand(self,datas):
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#expanding three dimension data to one dimension list
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data_expanded = []
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for i in range(len(datas)):
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shapes = np.shape(datas[i])
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data_listed = datas[i].reshape(1,shapes[0]*shapes[1])
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data_listed = data_listed.getA().tolist()[0]
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data_expanded.extend(data_listed)
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data_expanded = np.asarray(data_expanded)
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return data_expanded
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def _expand_mat(self,data_mat):
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#expanding matrix to one dimension list
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data_mat = np.asarray(data_mat)
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shapes = np.shape(data_mat)
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data_expanded = data_mat.reshape(1,shapes[0]*shapes[1])
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return data_expanded
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def _calculate_gradient_from_pool(self,out_map,pd_pool,num_map,size_map,size_pooling):
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'''
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calcluate the gradient from the data slice of pool layer
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pd_pool: list of matrix
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out_map: the shape of data slice(size_map*size_map)
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return: pd_all: list of matrix, [num, size_map, size_map]
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'''
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pd_all = []
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i_pool = 0
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for i_map in range(num_map):
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pd_conv1 = np.ones((size_map, size_map))
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for i in range(0, size_map, size_pooling):
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for j in range(0, size_map, size_pooling):
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pd_conv1[i:i + size_pooling, j:j + size_pooling] = pd_pool[i_pool]
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i_pool = i_pool + 1
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pd_conv2 = np.multiply(pd_conv1,np.multiply(out_map[i_map],(1-out_map[i_map])))
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pd_all.append(pd_conv2)
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return pd_all
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def trian(self,patterns,datas_train, datas_teach, n_repeat, error_accuracy,draw_e = bool):
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#model traning
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print('----------------------Start Training-------------------------')
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print(' - - Shape: Train_Data ',np.shape(datas_train))
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print(' - - Shape: Teach_Data ',np.shape(datas_teach))
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rp = 0
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all_mse = []
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mse = 10000
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while rp < n_repeat and mse >= error_accuracy:
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alle = 0
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print('-------------Learning Time %d--------------'%rp)
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for p in range(len(datas_train)):
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#print('------------Learning Image: %d--------------'%p)
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data_train = np.asmatrix(datas_train[p])
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data_teach = np.asarray(datas_teach[p])
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data_focus1,data_conved1 = self.convolute(data_train,self.conv1,self.w_conv1,
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self.thre_conv1,conv_step=self.step_conv1)
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data_pooled1 = self.pooling(data_conved1,self.size_pooling1)
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shape_featuremap1 = np.shape(data_conved1)
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'''
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print(' -----original shape ', np.shape(data_train))
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print(' ---- after convolution ',np.shape(data_conv1))
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print(' -----after pooling ',np.shape(data_pooled1))
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'''
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data_bp_input = self._expand(data_pooled1)
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bp_out1 = data_bp_input
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bp_net_j = np.dot(bp_out1,self.vji.T) - self.thre_bp2
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bp_out2 = self.sig(bp_net_j)
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bp_net_k = np.dot(bp_out2 ,self.wkj.T) - self.thre_bp3
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bp_out3 = self.sig(bp_net_k)
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#--------------Model Leaning ------------------------
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# calcluate error and gradient---------------
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pd_k_all = np.multiply((data_teach - bp_out3), np.multiply(bp_out3, (1 - bp_out3)))
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pd_j_all = np.multiply(np.dot(pd_k_all,self.wkj), np.multiply(bp_out2, (1 - bp_out2)))
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pd_i_all = np.dot(pd_j_all,self.vji)
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pd_conv1_pooled = pd_i_all / (self.size_pooling1*self.size_pooling1)
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pd_conv1_pooled = pd_conv1_pooled.T.getA().tolist()
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pd_conv1_all = self._calculate_gradient_from_pool(data_conved1,pd_conv1_pooled,shape_featuremap1[0],
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shape_featuremap1[1],self.size_pooling1)
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#weight and threshold learning process---------
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#convolution layer
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for k_conv in range(self.conv1[1]):
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pd_conv_list = self._expand_mat(pd_conv1_all[k_conv])
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delta_w = self.rate_weight * np.dot(pd_conv_list,data_focus1)
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self.w_conv1[k_conv] = self.w_conv1[k_conv] + delta_w.reshape((self.conv1[0],self.conv1[0]))
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self.thre_conv1[k_conv] = self.thre_conv1[k_conv] - np.sum(pd_conv1_all[k_conv]) * self.rate_thre
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#all connected layer
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self.wkj = self.wkj + pd_k_all.T * bp_out2 * self.rate_weight
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self.vji = self.vji + pd_j_all.T * bp_out1 * self.rate_weight
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self.thre_bp3 = self.thre_bp3 - pd_k_all * self.rate_thre
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self.thre_bp2 = self.thre_bp2 - pd_j_all * self.rate_thre
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# calculate the sum error of all single image
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errors = np.sum(abs((data_teach - bp_out3)))
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alle = alle + errors
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#print(' ----Teach ',data_teach)
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#print(' ----BP_output ',bp_out3)
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rp = rp + 1
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mse = alle/patterns
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all_mse.append(mse)
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def draw_error():
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yplot = [error_accuracy for i in range(int(n_repeat * 1.2))]
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plt.plot(all_mse, '+-')
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plt.plot(yplot, 'r--')
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plt.xlabel('Learning Times')
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plt.ylabel('All_mse')
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plt.grid(True, alpha=0.5)
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plt.show()
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print('------------------Training Complished---------------------')
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print(' - - Training epoch: ', rp, ' - - Mse: %.6f' % mse)
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if draw_e:
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draw_error()
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return mse
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def predict(self,datas_test):
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#model predict
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produce_out = []
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print('-------------------Start Testing-------------------------')
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print(' - - Shape: Test_Data ',np.shape(datas_test))
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for p in range(len(datas_test)):
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data_test = np.asmatrix(datas_test[p])
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data_focus1, data_conved1 = self.convolute(data_test, self.conv1, self.w_conv1,
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self.thre_conv1, conv_step=self.step_conv1)
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data_pooled1 = self.pooling(data_conved1, self.size_pooling1)
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data_bp_input = self._expand(data_pooled1)
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bp_out1 = data_bp_input
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bp_net_j = bp_out1 * self.vji.T - self.thre_bp2
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bp_out2 = self.sig(bp_net_j)
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bp_net_k = bp_out2 * self.wkj.T - self.thre_bp3
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bp_out3 = self.sig(bp_net_k)
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produce_out.extend(bp_out3.getA().tolist())
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res = [list(map(self.do_round,each)) for each in produce_out]
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return np.asarray(res)
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def convolution(self,data):
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#return the data of image after convoluting process so we can check it out
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data_test = np.asmatrix(data)
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data_focus1, data_conved1 = self.convolute(data_test, self.conv1, self.w_conv1,
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self.thre_conv1, conv_step=self.step_conv1)
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data_pooled1 = self.pooling(data_conved1, self.size_pooling1)
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return data_conved1,data_pooled1
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if __name__ == '__main__':
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pass
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'''
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I will put the example on other file
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'''
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