class ForwordNN(object):
def __init__(self,inputs,label,n_in,n_out,hiddensizes,L1_reg = 0.00,L2_reg=0.00,activation='sigmoid',output_activation='sigmoid',rng=None):
self.inputs = inputs
self.label = label
self.n_in = n_in
self.n_out = n_out
self.L1_reg = L1_reg
self.L2_reg = L2_reg
if rng is None:
self.rng = np.random.RandomState()
self.len_hid = len(hiddensizes)
# self.w = []
self.sizes = [self.n_in]+hiddensizes+[self.n_out]
self.layer = []
self.params = []
# self.hiddensizes = hiddensizes
input_temp = self.inputs
for i in range(len(hiddensizes)):
layer = Hiddenlayer(input_temp,self.sizes[i],self.sizes[i+1],activation=activation)
self.params += layer.params
self.layer.append(layer)
input_temp = layer.output
self.outlayer = OutputsLayer(self.layer[-1].output,self.sizes[-2],self.sizes[-1],self.label,activation = output_activation)
self.output=self.outputs(self.inputs)
self.params += self.outlayer.params
self.L2 = 0
self.L1 = 0
# self.L2 = ((self.layer[0].w**2).sum()+(self.outlayer.w**2).sum())
for i in range(len(self.layer)):
self.L2 += (self.layer[i].w**2).sum()
self.L1 += abs(self.layer[i].w).sum()
self.L2 += (self.outlayer.w**2).sum()
self.L1 += abs(self.outlayer.w).sum()
self.updates = {}
for param in self.params:
init = np.zeros(param.get_value(borrow=True).shape,dtype=theano.config.floatX)
self.updates[param]=theano.shared(init)
def outputs(self,inputs):
# for i in range(len(self.layer)):
outputs = self.outlayer.outputs(inputs)
return outputs
def predict_outputs(self,inputs):
temp_inputs = inputs
for i in xrange(len(self.layer)):
temp_outputs = self.layer[i].outputs(temp_inputs)
temp_inputs = temp_outputs
outputs = self.outlayer.outputs(temp_inputs)
return outputs
def get_cost_update(self,inputs,label,learning_Rate):
y = self.outputs(inputs)
self.label = label
self.cost = self.outlayer.cost(y,self.label)
dparams = [T.grad(self.cost,params) for params in self.params]
updates = [(param,param - learning_Rate*dparam)
for param,dparam in zip(self.params,dparams)
]
return self.cost,updates
def LeNet(learn_rate=0.01,batch_sizes=100,epochs=10,moment=0.0
,nkerns=[20,50],cv=5):
# datasets = load_data('mnist.pkl.gz')
# traindata,trainlabel = datasets[0]
all_traindata,all_trainlabel = load_train('../data/train.csv')
# print "all traindata's num is %d" % (all_traindata.shape[0])
if cv > 0 :
sizes = all_traindata.shape[0]/cv
traindata = all_traindata[0:(cv-1)*sizes,:]
trainlabel = all_trainlabel[0:(cv-1)*sizes,:]
validdata = all_traindata[(cv-1)*sizes:cv*sizes,:]
validlabel = all_trainlabel[(cv-1)*sizes:cv*sizes,:]
# print "traindata's num is %d,validdata's num is %d" % (traindata.shape[0],validdata.shape[0])
# train_m = traindata.shape[0]
# traindata = traindata.reshape((train_m,1,28,28))
traindata = theano.shared(np.asarray(traindata,theano.config.floatX),borrow=True)
trainlabel = theano.shared(np.asarray(trainlabel,theano.config.floatX),borrow=True)
validdata = theano.shared(np.asarray(validdata,theano.config.floatX),borrow=True)
validlabel = theano.shared(np.asarray(validlabel,theano.config.floatX),borrow=True)
testdata = load_test('../data/test.csv')
testdata = theano.shared(np.asarray(testdata,theano.config.floatX),borrow=True)
x=T.matrix('x')
y=T.matrix('y')
index = T.lscalar('index')
layer0_input = x.reshape((batch_sizes,1,28,28))
layer0 = ConvPoolLayer(inputs=layer0_input,filter_shape=(nkerns[0],1,5,5),image_shape=(batch_sizes,1,28,28),poolsize=(2,2))
# def __init__(self,inputs,filter_shape,image_shape,rng=None,poolsize=(2,2)):
layer1 = ConvPoolLayer(inputs=layer0.get_outputs(),filter_shape=(nkerns[1],nkerns[0],5,5),image_shape=(batch_sizes,nkerns[0],12,12),poolsize=(2,2))
layer2_input = layer1.get_outputs().flatten(2)
layer2 = Hiddenlayer(inputs=layer2_input,n_in=nkerns[1]*4*4,n_out=500,activation='tanh')
layer3 = OutputsLayer(inputs=layer2.outputs(layer2_input),n_in=500,n_out=10,labels=y,activation='softmax')
outputs = layer3.outputs(layer2.outputs(layer2_input))
cost = layer3.cost(outputs,y)
params = layer0.params+layer1.params+layer2.params+layer3.params
gparams = []
last_updates = {}
for param in params:
temp = np.zeros(param.get_value(borrow=True).shape,dtype=theano.config.floatX)
last_updates[param] = theano.shared(temp)
for param in params:
gparam = T.grad(cost,param)
gparams.append(gparam)
updates = OrderedDict()
for param,gparam in zip(params,gparams):
weight_update = last_updates[param]
upd = moment * weight_update - learn_rate * gparam
updates[weight_update] = upd
updates[param] = param + upd
batch_num = traindata.get_value(borrow=True).shape[0]/batch_sizes
batch_valid_num = validdata.get_value(borrow=True).shape[0]/batch_sizes
#print "traindata's num is %d,validdata's num is %d,vathc_sizes is %d" % (batch_num,batch_valid_num,batch_sizes)
#print "batch_valid_num is %d" % (batch_valid_num)
train_model = theano.function([index],
outputs=cost,
updates=updates,
givens={
x:traindata[index*batch_sizes:(index+1)*batch_sizes],
y:trainlabel[index*batch_sizes:(index+1)*batch_sizes]
}
)
valid_model = theano.function([index],
outputs=cost,
givens={
x:validdata[index*batch_sizes:(index+1)*batch_sizes],
y:validlabel[index*batch_sizes:(index+1)*batch_sizes]
}
)
predict_mode = theano.function([index],
outputs=outputs,
givens={
x:testdata[index*batch_sizes:(index+1)*batch_sizes]
}
)
best_valid_cost = np.inf
patience = 5000
patience_increase = 2
improvement_threshold = 0.995
epoch = 0
done_loop = False
valid_frequence = min(batch_num,patience/2)
while (epoch < epochs) and (done_loop is False):
epoch += 1
t1 = time.time()
mean_cost = []
valid_cost = []
for batch in xrange(int(batch_num)):
mean_cost.append(train_model(batch))
iter = (epoch - 1) * batch_num + batch
if (iter + 1) % valid_frequence == 0 :
for batch_val in xrange(int(batch_valid_num)):
valid_cost.append(valid_model(batch_val))
mean_valid_cost = np.mean(valid_cost)
if mean_valid_cost < best_valid_cost:
if mean_valid_cost < best_valid_cost * improvement_threshold:
patience = max(patience,iter*patience_increase)
best_valid_cost = mean_valid_cost
if patience <= iter:
done_loop = True
break
t2 = time.time()
print '%d/%d,takes %f seconds,the traindata mean cost is %f,the bestvaliddata mean cost is %f' % (epoch,epochs,(t2-t1),np.mean(mean_cost),best_valid_cost)
batch_test_num = testdata.get_value().shape[0]/batch_sizes
predict = []
print 'predict the data!'
for test_batch in xrange(batch_test_num):
temp = predict_mode(test_batch)
predict.append(temp)
label = predict[0]
for i in xrange(1,len(predict)):
label = np.vstack((label,predict[i]))
print 'predict is done!'
label = np.argmax(label,1)
id = range(1,28001)
print 'writing to the file'
o = pd.DataFrame(data={'ImageId':id,'Label':label})
o.to_csv('predict.csv',index=False,quoting=3)