def test_dA(train_set_x, train_set_x_feature_num,learning_rate=0.1, training_epochs=8,
batch_size=5, da_object = None):
#改batch_size也要改ml.py里面的b_s
# print train_set_x
# accessing the third minibatch of the training set
train_set_x = theano.shared(numpy.array(train_set_x))
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size #求出batch的个数
#print n_train_batches #这里是50000 / 20 = 2500
index = T.lscalar() # index to a [mini]batch
x = T.matrix('x') # the data is presented as rasterized images
# 使用denoise时
rng = numpy.random.RandomState(123)
theano_rng = RandomStreams(rng.randint(2 ** 30))
# da = dA(numpy_rng=rng, theano_rng=theano_rng, input=x,
# n_visible=28 * 28, n_hidden=500) # 创建dA对象时，并不需要数据x，只是给对象da中的一些网络结构参数赋值
if da_object is None:
da = dA(numpy_rng=rng, theano_rng=theano_rng, input=x,
n_visible= train_set_x_feature_num, n_hidden= train_set_x_feature_num*3/4) # 创建dA对象时，并不需要数据x，只是给对象da中的一些网络结构参数赋值
else:
#da = da_object
da = dA(numpy_rng=da_object.n_rng, theano_rng=da_object.theano_rng, input=x,
n_visible= train_set_x_feature_num, n_hidden= train_set_x_feature_num*3/4,
W = da_object.W, bvis = da_object.b_prime, bhid = da_object.b) # 创建dA对象时，并不需要数据x，只是给对象da中的一些网络结构参数赋值
cost, updates, y = da.get_cost_updates(corruption_level=0.3,
learning_rate=learning_rate)
train_da = theano.function([index], y, updates=updates, #theano.function()为定义一个符号函数，这里的自变量为indexy，指定input 参数是index（加了括号），指定output是cost，指定函数名称是上面的get_cost_updates
givens={x: train_set_x[index * batch_size: (index + 1) * batch_size]} ) #输出变量为cost
for epoch in xrange(training_epochs):
hiddeny = numpy.array([])
for batch_index in xrange(n_train_batches):
yy = train_da(batch_index)
sys.stdout.write("step:%d" % (batch_index + 1) + ' / ' + "%d" % n_train_batches + " %d%%" % ((batch_index + 1) * 100 / n_train_batches) + '\r')
sys.stdout.flush()
if hiddeny.size == 0:
hiddeny = yy
else:
hiddeny = numpy.concatenate((hiddeny, yy))
print '\n'
return hiddeny, da
def __init__(
self,
rng,
theano_rng,
input,
n_in,
n_hidden,
n_out,
f_load_MLP,
f_load_DA=None,
):
self.x = input
self.da = dA(
numpy_rng=rng,
theano_rng=theano_rng,
input=self.x,
n_visible=28 * 28,
n_hidden=n_hidden,
f_load=f_load_DA)
self.mlp = MLP(
rng=rng,
input=self.da.output,
f_load = f_load_MLP
)
self.params = self.da.params
self.output = self.da.output
self.L1 = abs(self.da.W).sum()
self.L2 = (self.da.W ** 2).sum()
def test_ndA(learning_rate=0.1):
rng = numpy.random.RandomState(123)
maxs = numpy.ones((111, )) * -numpy.Inf
mins = numpy.ones((111, )) * numpy.Inf
with open('datasets\\physMIMCsv.csv', 'rt') as csvin:
csvin = csv.reader(csvin, delimiter=',')
data = list()
for i, row in enumerate(csvin):
if i % 10000 == 0:
print(i)
if i > 0: #not header
x = numpy.asarray(row[64:175]).astype(float)
data.append([x])
maxs[x > maxs] = x[x > maxs]
mins[x < mins] = x[x < mins]
# construct dA
da = dA(n_visible=112, n_hidden=30, rng=rng)
pred = list()
for i, x in enumerate(data):
x[0] = (x[0] + mins) / (maxs - mins)
if i % 10000 == 0:
print(i)
if i < 1750648:
da.train(input=numpy.array(x),
lr=learning_rate,
corruption_level=0.1)
else:
p = da.reconstruct(x)
mse = ((p[0] - x[0])**2).mean(axis=0)
pred.append(mse)
def fit(self,X):
start_time = timeit.default_timer()
self.n_visible = X.shape[1]
train_set_x = self.load_data(X)
# compute number of minibatches for training, validation and testing
n_train_batches = train_set_x.get_value(borrow=True).shape[0]
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
rng = numpy.random.RandomState(123)
theano_rng = RandomStreams(rng.randint(2 ** 30))
self.da = dA(
numpy_rng=rng,
theano_rng=theano_rng,
input=self.x,
n_visible=self.n_visible,
n_hidden=self.n_hidden
)
cost, updates = self.da.get_cost_updates(
corruption_level=self.corruption_level,
learning_rate=self.learning_rate
)
train_da = theano.function(
[index],
cost,
updates=updates,
givens={
self.x: train_set_x[index * self.batch_size: (index + 1) * self.batch_size]
}
)
# training...
for epoch in range(0,self.training_epochs):
c = []
for batch_index in range(0,
n_train_batches):
c.append(train_da(batch_index))
if self.verbose:
print('Training epoch %d, cost ' % epoch, numpy.mean(c))
end_time = timeit.default_timer()
training_time = (end_time - start_time)
print(("The %d%% corruption code " % (self.corruption_level*100) +
' ran for %.2fm' % (training_time / 60.)), file=sys.stderr)
def fit(self,X):
start_time = timeit.default_timer()
self.n_visible = X.shape[1]
train_set_x = self.load_data(X)
# compute number of minibatches for training, validation and testing
n_train_batches = train_set_x.get_value(borrow=True).shape[0]
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
rng = numpy.random.RandomState(123)
theano_rng = RandomStreams(rng.randint(2 ** 30))
self.da = dA(
numpy_rng=rng,
theano_rng=theano_rng,
input=self.x,
n_visible=self.n_visible,
n_hidden=self.n_hidden
)
cost, updates = self.da.get_cost_updates(
corruption_level=self.corruption_level,
learning_rate=self.learning_rate
)
train_da = theano.function(
[index],
cost,
updates=updates,
givens={
self.x: train_set_x[index * self.batch_size: (index + 1) * self.batch_size]
}
)
# training...
for epoch in xrange(self.training_epochs):
c = []
for batch_index in xrange(n_train_batches):
c.append(train_da(batch_index))
if self.verbose:
print('Training epoch %d, cost ' % epoch, numpy.mean(c))
end_time = timeit.default_timer()
training_time = (end_time - start_time)
print(("The %d%% corruption code " % (self.corruption_level*100) +
' ran for %.2fm' % (training_time / 60.)), file=sys.stderr)
def fit(self, X):
self.n_visible = X.shape[1]
train_set_x = self.load_data(X)
# compute number of minibatches for training, validation and testing
n_train_batches = train_set_x.get_value(
borrow=True).shape[0] / self.batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
rng = numpy.random.RandomState(123)
theano_rng = RandomStreams(rng.randint(2**30))
self.da = dA(numpy_rng=rng,
theano_rng=theano_rng,
input=self.x,
n_visible=self.n_visible,
n_hidden=self.n_hidden)
cost, updates = self.da.get_cost_updates(
corruption_level=self.corruption_level,
learning_rate=self.learning_rate)
train_da = theano.function(
[index],
cost,
updates=updates,
givens={
self.x:
train_set_x[index * self.batch_size:(index + 1) *
self.batch_size]
})
# training...
for epoch in xrange(self.training_epochs):
c = []
for batch_index in xrange(n_train_batches):
c.append(train_da(batch_index))
if self.verbose:
print 'Training epoch %d, cost ' % epoch, numpy.mean(c)
def test_dA(learning_rate=0.1, corruption_level=0.0, training_epochs=50):
data = numpy.array(
[[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]])
rng = numpy.random.RandomState(123)
# construct dA
da = dA(input=data, n_visible=20, n_hidden=7, rng=rng)
# train
for epoch in range(training_epochs):
da.train(lr=learning_rate, corruption_level=corruption_level)
# cost = da.negative_log_likelihood(corruption_level=corruption_level)
# print >> sys.stderr, 'Training epoch %d, cost is ' % epoch, cost
# learning_rate *= 0.95
# test
x = numpy.array(
[[1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1],
[0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0]])
def __init__(
self,
rng,
theano_rng,
input,
n_in,
n_hidden,
n_out,
f_load_MLP,
f_load_DA=None,
):
self.x = input
self.da = dA(numpy_rng=rng,
theano_rng=theano_rng,
input=self.x,
n_visible=28 * 28,
n_hidden=n_hidden,
f_load=f_load_DA)
self.mlp = MLP(rng=rng, input=self.da.output, f_load=f_load_MLP)
self.params = self.da.params
self.output = self.da.output
self.L1 = abs(self.da.W).sum()
self.L2 = (self.da.W**2).sum()