def train_LR(self, lr):
trainer.train_LR(self, lr)
dataloader = DataLoader()
datasets =dataloader.load_shared_data()
train_set_x, train_set_y = datasets[0]
valid_set_x, valid_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]
params=np.empty((28*28)*10+10);
climin.initialize.randomize_normal(params,0,1)
params = params/(28*28)
lr.setParams(params);
x=lr.x
y=lr.y
cost = (
lr.negative_log_likelihood(y)
+ self.L1_lambda * lr.L1
+ self.L2_lambda * lr.L2_sqr
)
g_W = T.grad(cost=cost, wrt=lr.W)
g_b = T.grad(cost=cost, wrt=lr.b)
g_W_model = theano.function(
inputs=[x,y],
outputs=g_W
)
g_b_model = theano.function(
inputs=[x,y],
outputs=g_b
)
batch_size = self.batch_size
index = T.lscalar()
test_err_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
}
)
train_err_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
}
)
validate_err_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: valid_set_x[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
# compute number of minibatches for training, validation and testing
batch_size = self.batch_size;
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
def train_error():
train_losses = [train_err_model(i)
for i in xrange(n_train_batches)]
this_train_losses = np.mean(train_losses)
return this_train_losses;
def validate_error():
validation_losses = [validate_err_model(i)
for i in xrange(n_valid_batches)]
this_validation_loss = np.mean(validation_losses)
return this_validation_loss;
def test_error():
test_losses = [test_err_model(i)
for i in xrange(n_test_batches)]
this_test_loss = np.mean(test_losses)
return this_test_loss;
def d_loss_wrt_pars(parameters, inpt, targets):
lr.setParams(parameters)
gwValue = g_W_model(inpt,targets)
gbValue = g_b_model(inpt,targets)
return np.concatenate([gwValue.flatten(),gbValue])
args = ((i, {}) for i in climin.util.iter_minibatches([train_set_x.eval(), train_set_y.eval()], self.batch_size, [0, 0]))
opt = climin.rmsprop.RmsProp(params, d_loss_wrt_pars, step_rate=self.learning_rate,decay=self.decay, momentum=self.momentum, args=args)
validation_frequency = n_train_batches
directory=check_create_observations_dir()
self.output_directory = directory
bestValidationLoss = np.Inf;
for info in opt:
if info['n_iter'] % validation_frequency ==0:
epoch_no = info['n_iter']/n_train_batches
train_err=train_error()
validation_err = validate_error()
test_err = test_error()
self.add_train_data(epoch_no, train_err, validation_err, test_err)
if epoch_no % 10 ==0:
repfields_path=os.path.join(directory,"repFields"+str(epoch_no).zfill(3)+'.png')
W_vals=lr.W.get_value(borrow=True)
display(W_vals,repfields_path)
if epoch_no >= self.n_epochs:
break
if validation_err < bestValidationLoss:
bestValidationLoss = validation_err
#
# if validation_err *0.95 > bestValidationLoss:
#
# print "Best Validation Error : %f Validation err:%f " %(bestValidationLoss,validation_err)
# break;
if epoch_no > 15 and train_err < 0.9* validation_err:
break
print "Iteration no: %d Validation error = %f" %(epoch_no,validation_err*100)
trainer.save_errors(self, directory)
repfields_final_path=os.path.join(directory,"repFields.png")
W_vals=lr.W.get_value(borrow=True)
display(W_vals,repfields_final_path)
def train_LR(self, lr):
trainer.train_LR(self, lr)
dataloader = DataLoader()
datasets =dataloader.load_shared_data()
train_set_x, train_set_y = datasets[0]
valid_set_x, valid_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]
# compute number of minibatches for training, validation and testing
batch_size = self.batch_size;
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
index = T.lscalar() # index to a [mini]batch
x = lr.x # the data is presented as rasterized images
y = lr.y
cost = (
lr.negative_log_likelihood(y)
+ self.L1_lambda * lr.L1
+ self.L2_lambda * lr.L2_sqr
)
test_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
}
)
train_err_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
}
)
validate_model = theano.function(
inputs=[index],
outputs=lr.zeroOneLoss(y),
givens={
x: valid_set_x[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
g_W = T.grad(cost=cost, wrt=lr.W)
g_b = T.grad(cost=cost, wrt=lr.b)
updates = [(lr.W, lr.W - self.learning_rate * g_W),
(lr.b, lr.b - self.learning_rate * g_b)]
train_model = theano.function(
inputs=[index],
outputs=cost,
updates=updates,
givens={
x: train_set_x[index * batch_size: (index + 1) * batch_size],
y: train_set_y[index * batch_size: (index + 1) * batch_size]
}
)
def train_error():
train_losses = [train_err_model(i)
for i in xrange(n_train_batches)]
this_train_losses = numpy.mean(train_losses)
return this_train_losses;
def validate_error():
validation_losses = [validate_model(i)
for i in xrange(n_valid_batches)]
this_validation_loss = numpy.mean(validation_losses)
return this_validation_loss;
def test_error():
test_losses = [test_model(i)
for i in xrange(n_test_batches)]
this_test_loss = numpy.mean(test_losses)
return this_test_loss;
print '... training'
#Train in mini batches
minEpochs = 4
validationFrequency = n_train_batches;
iteration = 0;
bestValidationLoss = numpy.Inf;
max_epoch_reached = False
directory=check_create_observations_dir()
self.output_directory = directory
while not max_epoch_reached :
iteration = iteration + 1;
epochNo = (iteration / n_train_batches)
batchId= iteration % n_train_batches;
currentCost=train_model(batchId)
if iteration % validationFrequency == 0:
validation_err = validate_error()
test_err = test_error()
train_err = train_error()
print "Epoch no: %d Validation Loss = %f" %(epochNo,validation_err*100)
self.add_train_data(epochNo, train_err, validation_err, test_err)
if epochNo %5 ==0:
W_vals=lr.W.get_value(borrow=True)
repfields_path=os.path.join(directory,"repFields"+str(epochNo).zfill(3)+'.png')
display(W_vals,repfields_path)
if validation_err < bestValidationLoss:
bestValidationLoss = validation_err
if epochNo > minEpochs and validation_err *0.995 > bestValidationLoss:
#print "------------------------Validation Loss = %f" %(validationLoss*100)
break;
if epochNo >= self.n_epochs:
max_epoch_reached = True
testLoss=test_error()
print "iteration %d complete. Cost = %f Best Validation Loss = %f Test Loss = %f" %(iteration,currentCost,bestValidationLoss *100,testLoss *100)
trainer.save_errors(self, directory)
repfields_final_path=os.path.join(directory,"repFields.png")
W_vals=lr.W.get_value(borrow=True)
display(W_vals,repfields_final_path)