def train(data_file, use_gpu, num_epoch=10, batch_size=100):
print 'Start intialization............'
lr = 0.1 # Learning rate
weight_decay = 0.0002
hdim = 1000
vdim = 784
opt = optimizer.SGD(momentum=0.8, weight_decay=weight_decay)
tweight = tensor.Tensor((vdim, hdim))
tweight.gaussian(0.0, 0.1)
tvbias = tensor.from_numpy(np.zeros(vdim, dtype = np.float32))
thbias = tensor.from_numpy(np.zeros(hdim, dtype = np.float32))
opt = optimizer.SGD(momentum=0.5, weight_decay=weight_decay)
print 'Loading data ..................'
train_x, valid_x = load_train_data(data_file)
if use_gpu:
dev = device.create_cuda_gpu()
else:
dev = device.get_default_device()
for t in [tweight, tvbias, thbias]:
t.to_device(dev)
num_train_batch = train_x.shape[0] / batch_size
print "num_train_batch = %d " % (num_train_batch)
for epoch in range(num_epoch):
trainerrorsum = 0.0
print 'Epoch %d' % epoch
for b in range(num_train_batch):
# positive phase
tdata = tensor.from_numpy(
train_x[(b * batch_size):((b + 1) * batch_size), : ])
tdata.to_device(dev)
tposhidprob = tensor.mult(tdata, tweight)
tposhidprob.add_row(thbias)
tposhidprob = tensor.sigmoid(tposhidprob)
tposhidrandom = tensor.Tensor(tposhidprob.shape, dev)
tposhidrandom.uniform(0.0, 1.0)
tposhidsample = tensor.gt(tposhidprob, tposhidrandom)
# negative phase
tnegdata = tensor.mult(tposhidsample, tweight.T())
tnegdata.add_row(tvbias)
tnegdata = tensor.sigmoid(tnegdata)
tneghidprob = tensor.mult(tnegdata, tweight)
tneghidprob.add_row(thbias)
tneghidprob = tensor.sigmoid(tneghidprob)
error = tensor.sum(tensor.square((tdata - tnegdata)))
trainerrorsum = error + trainerrorsum
tgweight = tensor.mult(tnegdata.T(), tneghidprob) -\
tensor.mult(tdata.T(), tposhidprob)
tgvbias = tensor.sum(tnegdata, 0) - tensor.sum(tdata, 0)
tghbias = tensor.sum(tneghidprob, 0) - tensor.sum(tposhidprob, 0)
opt.apply_with_lr(epoch, lr / batch_size, tgweight, tweight, 'w')
opt.apply_with_lr(epoch, lr / batch_size, tgvbias, tvbias, 'vb')
opt.apply_with_lr(epoch, lr / batch_size, tghbias, thbias, 'hb')
print 'training errorsum = %f' % (trainerrorsum)
tvaliddata = tensor.from_numpy(valid_x)
tvaliddata.to_device(dev)
tvalidposhidprob = tensor.mult(tvaliddata, tweight)
tvalidposhidprob.add_row(thbias)
tvalidposhidprob = tensor.sigmoid(tvalidposhidprob)
tvalidposhidrandom = tensor.Tensor(tvalidposhidprob.shape, dev)
initializer.uniform(tvalidposhidrandom, 0.0, 1.0)
tvalidposhidsample = tensor.gt(tvalidposhidprob, tvalidposhidrandom)
tvalidnegdata = tensor.mult(tvalidposhidsample, tweight.T())
tvalidnegdata.add_row(tvbias)
tvalidnegdata = tensor.sigmoid(tvalidnegdata)
validerrorsum = tensor.sum(tensor.square((tvaliddata - tvalidnegdata)))
print 'valid errorsum = %f' % (validerrorsum)
def train(data_file, use_gpu, num_epoch=10, batch_size=100):
print('Start intialization............')
lr = 0.1 # Learning rate
weight_decay = 0.0002
hdim = 1000
vdim = 784
tweight = tensor.Tensor((vdim, hdim))
tweight.gaussian(0.0, 0.1)
tvbias = tensor.from_numpy(np.zeros(vdim, dtype=np.float32))
thbias = tensor.from_numpy(np.zeros(hdim, dtype=np.float32))
opt = optimizer.SGD(momentum=0.5, weight_decay=weight_decay)
print('Loading data ..................')
train_x, valid_x = load_train_data(data_file)
if use_gpu:
dev = device.create_cuda_gpu()
else:
dev = device.get_default_device()
for t in [tweight, tvbias, thbias]:
t.to_device(dev)
num_train_batch = train_x.shape[0] // batch_size
print("num_train_batch = %d " % (num_train_batch))
for epoch in range(num_epoch):
trainerrorsum = 0.0
print('Epoch %d' % epoch)
for b in range(num_train_batch):
# positive phase
tdata = tensor.from_numpy(
train_x[(b * batch_size):((b + 1) * batch_size), :])
tdata.to_device(dev)
tposhidprob = tensor.mult(tdata, tweight)
tposhidprob = tposhidprob + thbias
tposhidprob = tensor.sigmoid(tposhidprob)
tposhidrandom = tensor.Tensor(tposhidprob.shape, dev)
tposhidrandom.uniform(0.0, 1.0)
tposhidsample = tensor.gt(tposhidprob, tposhidrandom)
# negative phase
tnegdata = tensor.mult(tposhidsample, tweight.T())
tnegdata = tnegdata + tvbias
tnegdata = tensor.sigmoid(tnegdata)
tneghidprob = tensor.mult(tnegdata, tweight)
tneghidprob = tneghidprob + thbias
tneghidprob = tensor.sigmoid(tneghidprob)
error = tensor.sum(tensor.square((tdata - tnegdata)))
trainerrorsum = error + trainerrorsum
tgweight = tensor.mult(tnegdata.T(), tneghidprob) \
- tensor.mult(tdata.T(), tposhidprob)
tgvbias = tensor.sum(tnegdata, 0) - tensor.sum(tdata, 0)
tghbias = tensor.sum(tneghidprob, 0) - tensor.sum(tposhidprob, 0)
opt.apply_with_lr(epoch, lr / batch_size, tgweight, tweight, 'w')
opt.apply_with_lr(epoch, lr / batch_size, tgvbias, tvbias, 'vb')
opt.apply_with_lr(epoch, lr / batch_size, tghbias, thbias, 'hb')
print('training erroraverage = %f' %
(tensor.to_numpy(trainerrorsum) / train_x.shape[0]))
tvaliddata = tensor.from_numpy(valid_x)
tvaliddata.to_device(dev)
tvalidposhidprob = tensor.mult(tvaliddata, tweight)
tvalidposhidprob = tvalidposhidprob + thbias
tvalidposhidprob = tensor.sigmoid(tvalidposhidprob)
tvalidposhidrandom = tensor.Tensor(tvalidposhidprob.shape, dev)
initializer.uniform(tvalidposhidrandom, 0.0, 1.0)
tvalidposhidsample = tensor.gt(tvalidposhidprob, tvalidposhidrandom)
tvalidnegdata = tensor.mult(tvalidposhidsample, tweight.T())
tvalidnegdata = tvalidnegdata + tvbias
tvalidnegdata = tensor.sigmoid(tvalidnegdata)
validerrorsum = tensor.sum(tensor.square((tvaliddata - tvalidnegdata)))
print('valid erroraverage = %f' %
(tensor.to_numpy(validerrorsum) / valid_x.shape[0]))